Journal articles: 'Active voice control'

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Bai, Mingsian R., and Kwuen-Yieng Ou. "Design and Implementation of Electromagnetic Active Control Actuators." Journal of Vibration and Control 9, no. 8 (August 2003): 997–1017. http://dx.doi.org/10.1177/10775463030098006.

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We present the modeling, parameter identification and design procedure of a linear voice-coil motor. A numerical simulation has been carried out to facilitate system integration. In particular, we use electromechanical analogy and the time-domain identification procedure with the eigensystem realization algorithm to predict the system response. In order to evaluate the performance of the voice-coil motor, we conducted an experimental investigation. Voice-coil motors mounted on a ball bearing housing are used for generating counter forces to cancel the transverse vibrations of a shaft. A controller is designed by using generalized predictive control. Multiple channel active control systems are implemented on the platform of a digital signal processor. Numerical and experimental results indicated that the designed actuators were effective in suppressing the periodic disturbances in rotors.

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TANAKA, Ryoutaro, Yosuke KOBA, Satoshi ISHIKAWA, and Shinya KIJIMOTO. "Voice clarification using active noise control and speech separation." Transactions of the JSME (in Japanese) 86, no. 882 (2020): 19–00164. http://dx.doi.org/10.1299/transjsme.19-00164.

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TANAKA, Toshihiro, masaharu NISHIMURA, shinichiro NISHIDA, and kazunori SAKURAMA. "417 Development of Voice Shutter by Active Noise Control." Proceedings of Conference of Chugoku-Shikoku Branch 2014.52 (2014): _417–1_—_417–4_. http://dx.doi.org/10.1299/jsmecs.2014.52._417-1_.

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An, Zengyong, Minglong Xu, Yajun Luo, and Chengsong Wu. "Active Vibration Control for a Large Annular Flexible Structure via a Macro-Fiber Composite Strain Sensor and Voice Coil Actuator." International Journal of Applied Mechanics 07, no. 04 (August 2015): 1550066. http://dx.doi.org/10.1142/s1758825115500660.

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Large annular flexible structures (LAFS) are typical antenna structures for satellites. This structure can significantly increase antenna aperture and effectively improve communication accuracy with minimum addition of mass. LAFS have become mainstream for large aperture antenna structures. However, they have disadvantages, such as low natural frequencies, low damping ratio, and low stiffness. They easily suffer from low frequency, longtime and modal responses. Therefore, the vibration control of LAFS is very important. This study proposes a novel active vibration control method using macro-fiber composite (MFC) as a sensing unit, a voice coil actuator and a PD-fuzzy control algorithm. The MFC sensor can measure a minimum strain of 10-8 m/m. The voice coil actuator generates a displacement and driving force. Based on the feedback signal from the MFC sensor, the PD-fuzzy control algorithm controls the voice coil actuator. A dynamic model of LAFS was established, and its characteristics analyzed. A theoretical model for the voice coil actuator and MFC sensor were established, and the corresponding governing equations derived. An experimental system was set up. The results demonstrated that the novel active vibration control method has good performance. This active vibration control method can control vibration at ultralow frequencies and requires no additional stiffness.

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Wang, Jie, Zhi En Liu, Jia Wei Zeng, and Chao Wang. "Development of Engine Exhaust Active Noise Control System." Advanced Materials Research 986-987 (July 2014): 1196–200. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1196.

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In order to enhance the capacity of elimination of engine exhaust low frequency noise, a set of engine exhaust active noise control system was developed. The system was developed by using MC9S12XS128 MCU, and it is based on the theory of sound wave interference. The system can realize the voice signal acquisition, reverse phase processing and output, and can eliminate engine exhaust low frequency noise. Experimental results showed that the system has good silencing effects on the engine exhaust noise under the steady state.

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Kurita, Yutaka, and Yasushi Muragishi. "Active Control of Vibration Isolation System in Vehicle Using Voice Coil Motors." Transactions of the Japan Society of Mechanical Engineers Series C 61, no. 586 (1995): 2280–85. http://dx.doi.org/10.1299/kikaic.61.2280.

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Yun-Hui, Liu, and Wu Wei-Hao. "Active Vibration Isolation Using a Voice Coil Actuator with Absolute Velocity Feedback Control." International Journal of Automation and Smart Technology 3, no. 4 (December 1, 2013): 221–26. http://dx.doi.org/10.5875/ausmt.v3i4.215.

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Burnett, Theresa A., and Charles R. Larson. "Early pitch-shift response is active in both steady and dynamic voice pitch control." Journal of the Acoustical Society of America 112, no. 3 (September 2002): 1058–63. http://dx.doi.org/10.1121/1.1487844.

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Hoffman, R. E., M. Varanko, J. Gilmore, and A. L. Mishara. "Experiential features used by patients with schizophrenia to differentiate ‘voices’ from ordinary verbal thought." Psychological Medicine 38, no. 8 (November 30, 2007): 1167–76. http://dx.doi.org/10.1017/s0033291707002395.

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BackgroundDetermining how patients distinguish auditory verbal hallucinations (AVHs) from their everyday thoughts may shed light on neurocognitive processes leading to these symptoms.MethodFifty patients reporting active AVHs (‘voices’) with a diagnosis of schizophrenia or schizo-affective disorder were surveyed using a structured questionnaire. Data were collected to determine: (a) the degree to which patients distinguished voices from their own thoughts; (b) the degree to which their thoughts had verbal form; and (c) the experiential basis for identifying experiences as voices versus their own verbal thoughts. Six characteristics of acoustic/verbal images were considered: (1) non-self speaking voice, (2) loudness, (3) clarity, (4) verbal content, (5) repetition of verbal content, and (6) sense of control.ResultsFour subjects were eliminated from the analysis because they reported absent verbal thought or a total inability to differentiate their own verbal thoughts from voices. For the remaining 46 patients, verbal content and sense of control were rated as most salient in distinguishing voices from everyday thoughts. With regard to sensory/perceptual features, identification of speaking voice as non-self was more important in differentiating voices from thought than either loudness or clarity of sound images.ConclusionsMost patients with schizophrenia and persistent AVHs clearly distinguish these experiences from their everyday thoughts. An adequate mechanistic model of AVHs should account for distinctive content, recognizable non-self speaking voices, and diminished sense of control relative to ordinary thought. Loudness and clarity of sound images appear to be of secondary importance in demarcating these hallucination experiences.

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Chen, Qiming, Liyi Li, Mingyi Wang, and Le Pei. "The precise modeling and active disturbance rejection control of voice coil motor in high precision motion control system." Applied Mathematical Modelling 39, no. 19 (October 2015): 5936–48. http://dx.doi.org/10.1016/j.apm.2015.04.031.

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Cao, Hui, Shuang Yue Li, and Xiao Peng Yao. "Study on Technology of Noncircular NC Turning Based on Active Disturbance Rejection Control." Advanced Materials Research 201-203 (February 2011): 1508–11. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.1508.

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In this paper, new technology of noncircular turning was presented, a voice coil motor-driven fasting tool servo system was established. A dual stage actuator mechanism was designed for the variable rake angle tool in noncircular turning process. The kinematics of mechanism was analyzed. An active disturbance rejection control technique was applied in mechanism control. The tool feeding and the workpiece rotation synchronized by using time-base method of PMAC and achieved the noncircular auto turning. The result shows that it can improve the precision and efficiency of noncircular turning based on active disturbance rejection control.

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Hassan, Ali, Angel Torres-Perez, Stefan Kaczmarczyk, and Phil Picton. "ACTIVE VIBRATION CONTROL FOR A FREE PISTON STIRLING ENGINE GENERATOR USING A VOICE COIL ACTUATOR." MM Science Journal 2015, no. 01 (March 11, 2015): 547–54. http://dx.doi.org/10.17973/mmsj.2015_03_201503.

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SHIRATORI, Koji, Masaharu NISHIMURA, Shinichiro NISHIDA, and Kazunori SAKURAMA. "516 Development of Voice Shutter by Active Noise Control : Phase 2: Study of open type." Proceedings of Conference of Chugoku-Shikoku Branch 2015.53 (2015): _516–1_—_516–2_. http://dx.doi.org/10.1299/jsmecs.2015.53._516-1_.

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Minardo, Aldo, Agnese Coscetta, Salvatore Pirozzi, and Luigi Zeni. "Brillouin Optical Time Domain Analysis Sensor for Active Vibration Control of a Cantilever Beam." Journal of Sensors 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/1351378.

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The paper reports the use of a distributed optical fiber sensor based on stimulated Brillouin scattering, for structural vibration control. A cantilevered flexible aluminum beam was used as test-bed for vibration control. The proposed approach allows acquiring simultaneously the dynamic strain at several locations. The dynamic strain measured at one (or more) fiber location can be used to implement any vibration control algorithm. Experimental results are reported in which a voice coil, positioned near the fixed end of the cantilever beam, was employed as actuator for the reduction of the vibrations related to the first bending mode of the beam.

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Tang, Jie, Dengqing Cao, and Tianhu Yu. "Decentralized vibration control of a voice coil motor-based Stewart parallel mechanism: Simulation and experiments." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 1 (February 12, 2018): 132–45. http://dx.doi.org/10.1177/0954406218756941.

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In pursuit of a better working performance of the precise instruments equipped in spacecraft, vibration control systems are essential for preventing them from being disturbed. This paper studies the decentralized vibration control problems of a voice coil motor-based Stewart parallel mechanism. The Newton–Euler Method is used to formulate the dynamical equations of the Stewart platform in joint space. The decentralized control theory is employed to design the controller for the linearized system. A prototype of the voice coil motor-based Stewart platform was designed and tested to validate the vibration attenuation performance of the decentralized system. The effectiveness of active vibration isolation system is revealed by both the simulation and real-time experiments.

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Chi, Wei Chao, Deng Qing Cao, and Wen Hu Huang. "An Observer-Based Active Vibration Isolation System Using the Voice-Coil Actuator." Advanced Materials Research 846-847 (November 2013): 161–66. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.161.

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This paper focuses on an active vibration isolator based on voice-coil motor (VCM). The isolator may reduce the vibration in the range from 5 to 100Hz in one DOF which can provide the payloads on a satellite a more stable working environment. A VCM is designed and optimized to provide enough feedback force; the state-space model is established according to the basic governing equations of the VCM. The LQR controller based on a reduced-order observer is designed for an output feedback control system. The vibration isolation system is verified by numerical simulations and experiments in which the VCM is installed between the payload and the excitation bottom, with an accelerometer located on the payload in the vertical direction. Both the simulation and experiment results show that the vibration of the payload is reduced effectively using the voice-coil actuator designed here.

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Liu, Yun-Hui. "Application of a Proportional Feedback Controller for Active Control of a Vibration Isolator." Journal of Low Frequency Noise, Vibration and Active Control 24, no. 3 (September 2005): 181–90. http://dx.doi.org/10.1260/026309205775374442.

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This paper proposes the application of a proportional controller to active vibration control incorporated with a passive vibration isolator to suppress its resonant oscillation at its natural frequency. Vibration acceleration acquired from an accelerometer is fed to the controller as a feedback signal. The processed signal from the controller is transmitted to the voice coil actuator in order to control the vibration. Firstly, based on the theoretical equations which govern the vibrational system, the physical mechanism of active control in the total system is studied. Then, vibration on a stiff foundation and passive isolator is measured in order to understand the efficiency of the traditional vibration control method. Finally, an experiment on active vibration control is performed to study the suppression efficiency of the oscillation of the passive vibration isolator. The experiment results show that 99% of the vibration energy can be cancelled by active control.

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Chen, Lu, Shi Hai Fan, and Shi Nan Zhang. "Noise-Reducing and Effect-Enhancing System for Communication Equipment Mounted on Vehicle." Applied Mechanics and Materials 623 (August 2014): 161–68. http://dx.doi.org/10.4028/www.scientific.net/amm.623.161.

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The noise of communication equipment mounted on Vehicle is one of important factors affecting equipment efficiency. Active Noise Control (ANC) technology is applied to noise reduction of the equipment, and a noise reduction mathematics model is built based on accurate noise measurement. An approach to reduce noise based on first-order differential microphone (FDM) array and ANF technology is proposed, which collects and evaluates environmental noise precisely to enhance voice. This approach improves the conversation effects and realizes full fidelity of voice transmission.

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Folds, Dennis J., and Roderick A. Beard. "Aircrew Recommendations for Voice Message Functions in Tactical Aircraft." Proceedings of the Human Factors Society Annual Meeting 32, no. 2 (October 1988): 63–67. http://dx.doi.org/10.1177/154193128803200212.

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Results are presented from a survey of 135 active tactical aircrews regarding use of synthetic voice messages in tactical aircraft. The sample was primarily composed of F-16, F-15, and F-4 pilots. The participants rated 69 existing, proposed, or suggested functions for voice messages in tactical aircraft. Over two-thirds of the participants rated the following functions favorably: Engine Fire, Fuel Low, Oil Pressure, Hydraulic Pressure, Brakes Malfunction, Landing Gear Malfunction, Gear/Flaps Configuration, Low Altitude, Missile Launch, Threat Display, Bingo Fuel, and Joker Fuel. Other functions, applicable to some but not all tactical aircraft, received strong support from the aircrews of the applicable aircraft. The participants' responses to open-ended questions, concerning use of voice messages for checklists and desirable control features for voice message systems, are also summarized.

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A. Hochwarter, Wayne, B. Parker Ellen III, and Gerald R. Ferris. "Examining the interactive effects of accountability, politics, and voice." Career Development International 19, no. 4 (August 5, 2014): 358–80. http://dx.doi.org/10.1108/cdi-01-2014-0012.

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Purpose – Research has shown accountability can produce both positive and negative outcomes. Further, because of inherent environmental uncertainty, perceptions of organizational politics often interact with accountability to produce negative effects. However, using uncertainty management theory, the purpose of this paper is to argue that employees can use proactive voice to exercise control in the ambiguity of highly accountable and political environments. Design/methodology/approach – This two sample study of graduate school alumni (n=211) and insurance employees (n=186) explored the three-way interaction of felt accountability×politics perceptions×proactive voice on work performance, job satisfaction, and job tension. Findings – As hypothesized, high levels of felt accountability and politics were most strongly associated with favorable outcomes when coupled with increased voice behavior. Conversely, felt accountability and politics were related to negative outcomes in settings associated with low proactive voice. Results supported in Sample 1 were then constructively replicated in Sample 2. Practical implications – All employees are held accountable to some degree, and all work in potentially political settings. Often, these environmental features are dictated to employees, leaving only employee reactions in direct control. One possible response is voice. As demonstrated in the present research, employees who engage in proactive voice appear to exercise some degree of control over their environment, resulting in more positive outcomes than their less active counterparts. Originality/value – The present research extends understanding regarding the effects of accountability in organizations by demonstrating that contextual factors (e.g. politics) and individual difference variables (e.g. in levels of proactive voice) differentiate favorable vs unfavorable outcomes of accountability.

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Tamplin, Jeanette, Meg E. Morris, Caterina Marigliani, Felicity A. Baker, and Adam P. Vogel. "ParkinSong: A Controlled Trial of Singing-Based Therapy for Parkinson’s Disease." Neurorehabilitation and Neural Repair 33, no. 6 (May 12, 2019): 453–63. http://dx.doi.org/10.1177/1545968319847948.

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Background. Communication impairment is one of the most common symptoms of Parkinson’s disease (PD), significantly affecting quality of life. Singing shares many of the neural networks and structural mechanisms used during speech and, thus, has potential for therapeutic application to address speech disorders. Objective. To explore the effects of an interdisciplinary singing-based therapeutic intervention (ParkinSong) on voice and communication in people with PD. Methods. A controlled trial compared the effects of the ParkinSong intervention with an active control condition at 2 dosage levels (weekly vs monthly) over 3 months, on voice, speech, respiratory strength, and voice-related quality-of-life outcomes for 75 people living with PD. The interdisciplinary ParkinSong model comprised high-effort vocal and respiratory tasks, speech exercises, group singing, and social communication opportunities. Results. ParkinSong intervention participants demonstrated significant improvements in vocal intensity ( P = .018), maximum expiratory pressure ( P = .032), and voice-related quality of life ( P = .043) in comparison to controls. Weekly ParkinSong participants increased vocal intensity more than monthly participants ( P = .011). Vocal intensity declined in nontreatment control groups. No statistical differences between groups on maximum phonation length or maximum inspiratory pressure were observed at 3 months. Conclusions. ParkinSong is an engaging intervention with the potential to increase loudness and respiratory function in people with mild to moderately severe PD.

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Oshinoya, Y., Y. Suzuki, and K. Ishibashi. "Active Control of a Small-Vehicle Seat Using a Voice-Coil Motor: Experimental Considerations on the Use of Disturbance Cancellation Control." Journal of the Magnetics Society of Japan 29, no. 3 (2005): 332–37. http://dx.doi.org/10.3379/jmsjmag.29.332.

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Zhang, Hai-Tao, Zhiyong Chen, Puwei Chen, Xiaoming Zhang, and Han Ding. "Saturated Output Regulation Approach for Active Vibration Control of Thin-Walled Flexible Workpieces With Voice Coil Actuators." IEEE/ASME Transactions on Mechatronics 21, no. 1 (February 2016): 266–75. http://dx.doi.org/10.1109/tmech.2015.2440425.

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Huang, Jun You. "The Intelligent Identification and Control Systems of Vehicles Drunk Driving." Advanced Materials Research 926-930 (May 2014): 1459–62. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.1459.

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In the light of the passive safety testing method of drunk driving, a new active safe product is designed in the field of automotive electronics: on-board automatic monitoring system for drunk driving. Based on PIC processor control system, the modularity is adopted including sensor detection sub-module, voice and display sub-module, a banned driving control sub-module after drunken, GSM sub-module, GPS positioning receive design ideas of sub-module, and complete the hardware circuit design. In MPLAB-IDE integrated development environment, the PICC compiler is adopted to complete the software design of the system. The maximum error of concentration testing experimental result is 8.2%.

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Li, Yunfeng, Federico Marcassa, Roberto Horowitz, Roberto Oboe, and Robert Evans. "Track-Following Control With Active Vibration Damping of a PZT-Actuated Suspension Dual-Stage Servo System." Journal of Dynamic Systems, Measurement, and Control 128, no. 3 (November 1, 2005): 568–76. http://dx.doi.org/10.1115/1.2229257.

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In this paper we discuss the controller design of a PZT-actuated suspension dual-stage servo system in hard disk drives. The proposed control structure includes an active vibration damping control loop and a track-following control loop. The vibration damping control loop, which runs at a faster rate than the track-following control loop, utilizes a PZT element on a PZT-actuated suspension as a vibration sensor to damp the resonance modes of the voice coil motor (VCM) and the PZT actuator. The vibration damping controller is designed using Kalman filter based state feedback control techniques. A simple dual-stage track-following controller is designed, based on the damped actuator model, using the sensitivity function decoupling design method. Simulation and experimental results are presented to demonstrate the benefits of this control scheme in expanding servo control bandwidth and suppressing airflow excited structural vibrations.

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Kraus, Karel, Zbyněk Šika, Petr Beneš, Jan Krivošej, and Tomáš Vyhlídal. "Mechatronic robot arm with active vibration absorbers." Journal of Vibration and Control 26, no. 13-14 (April 3, 2020): 1145–56. http://dx.doi.org/10.1177/1077546320918488.

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Serial robots are typically able to cover large workspace, but their mass/stiffness ratio does not allow combining high accuracy and high dynamic of the end effector operations. Widely spread usage of serial robots, even for tasks such as drilling, leads to high accuracy demands through its workspace. Absolute measurement of the end point for position feedback can be challenging due to objects or even a workpiece in the workspace. Moreover, inbuilt motors of the serial robot cannot response in the frequency range high enough as vibration of the end point. Instead, an additional spring–mass system is attached to the robot to suppress vibrations. The narrow frequency range of a passive dynamic absorber can be extended with active elements between the robot and absorber. An active approach is also necessary because of robots eigenfrequencies and eigenmodes variability. The study deals with a planar flexible robot equipped with a three-degree-of-freedom planar active absorber. The absorber is tuned passively to one value of multiple eigenfrequency. The linear-quadratic regulator control with a state observer has been designed as an active absorber control algorithm. Feedback inputs are absorber body acceleration, end effector acceleration, and relative motions in three absorber actuators realized by voice coils. The end effector vibration suppression along the robot trajectory is achieved using gain scheduling of local controller’s outputs.

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Guinot, Francisco, Mercè Virolés, Clàudia Lluch, Ana Luisa Costa, and Ana Veloso. "Spanish and Portuguese Parental Acceptance of Behavior Management Techniques in Pediatric Dentistry." Journal of Clinical Pediatric Dentistry 45, no. 4 (September 17, 2021): 247–52. http://dx.doi.org/10.17796/1053-4625-45.4.5.

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Aim. To compare acceptance of behavior management techniques used in pediatric dentistry by Spanish and Portuguese parents. Study design. cross-sectional study. A survey of 8 behavior management techniques used in pediatric dentistry was administered to parents whose children were being treated at the Universitat Internacional de Cataluña (Barcelona, Spain) or at the Universidade de Coimbra (Portugal). The techniques evaluated were: tell–show–do (TSD), nitrous oxide sedation, passive restraint using a papoose board, voice control, hand-over-mouth, oral premedication, active restraint and general anaesthesia. The questionnaire also included information on parents’ sex, number and sex of children receiving treatment, parents’ previous dental experience (positive or negative), children’s previous dental experience (positive or negative), and the socioeconomic status of the families. Results. TSD and voice control were rated the most acceptable techniques in both Spain and Portugal, whereas the least accepted techniques in both countries were active and passive restraint. There were no significant differences in the acceptance of each of the techniques, in relation to parents’ sex or their previous dental experience, children’s sex or age, children’s previous dental experience, or families’ socioeconomic status. Conclusion. TSD was the most widely accepted behavior-management technique by Spanish and Portuguese parents, even with the passage of time. Both groups of parents had a low opinion of active and passive restraint techniques.

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Yoshioka, H., Y. Takahashi, K. Katayama, T. Imazawa, and N. Murai. "An Active Microvibration Isolation System for Hi-tech Manufacturing Facilities." Journal of Vibration and Acoustics 123, no. 2 (October 1, 2000): 269–75. http://dx.doi.org/10.1115/1.1350566.

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This paper presents an active microvibration isolation system using voice-coil linear motors, and pneumatic and piezoelectric actuators. This system is designed to reduce microvibration of the six degrees-of-freedom associated with the rigid body modes of the vibration isolation table by feeding back the pseudo absolute displacement and velocity of the table. To improve vibration isolation performance, a feed-forward control link is added to the sway components in each dimension. This system can also control bending modes of the table in the frequency range up to 200 Hz by employing a proposed Virtual Tuned-Mass Damper control strategy, which is a type of the pole assignment method. In this approach, the pole locations are chosen by a genetic algorithm. For ambient microvibration of the floor around 0.5 cm/s2 and for small earthquakes of around 8 cm/s2 a reduction by a factor of 100 was achieved in the acceleration of the vibration isolation table. Moreover, the vibration of the isolation table was decreased over the entire frequency range. This system also showed good vibration control performance when an impact excitation was applied directly to the table; vibration was damped out within about 0.1 sec. Additionally, the resonance amplitudes around the bending modes of the table were reduced from 1/5 to 1/15 by the Virtual Tuned-Mass Damper method.

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Erdmann, Ralf, Andreas Pätzold, Marcus Engert, Inken Peltzer, and Wolfgang Nitsche. "On active control of laminar–turbulent transition on two-dimensional wings." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, no. 1940 (April 13, 2011): 1382–95. http://dx.doi.org/10.1098/rsta.2010.0364.

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This paper gives an overview of drag reduction on aerofoils by means of active control of Tollmien–Schlichting (TS) waves. Wind-tunnel experiments at Mach numbers of up to M x =0.42 and model Reynolds numbers of up to Re c =2×10 6 , as well as in-flight experiments on a wing glove at Mach numbers of M <0.1 and at a Reynolds number of Re c =2.4×10 6 , are presented. Surface hot wires were used to detect the linearly growing TS waves in the transitional boundary layer. Different types of voice-coil- and piezo-driven membrane actuators, as well as active-wall actuators, located between the reference and error sensors, were demonstrated to be effective in introducing counter-waves into the boundary layer to cancel the travelling TS waves. A control algorithm based on the filtered- x least mean square (FxLMS) approach was employed for in-flight and high-speed wind-tunnel experiments. A model-predictive control algorithm was tested in low-speed experiments on an active-wall actuator system. For the in-flight experiments, a reduction of up to 12 dB (75% TS amplitude) was accomplished in the TS frequency range between 200 and 600 Hz. A significant reduction of up to 20 dB (90% TS amplitude) in the flow disturbance amplitude was achieved in high-speed wind-tunnel experiments in the fundamental TS frequency range between 3 and 8 kHz. A downstream shift of the laminar–turbulent transition of up to seven TS wavelengths is presented. The cascaded sensor–actuator arrangement given by Sturzebecher & Nitsche in 2003 for low-speed wind-tunnel experiments was able to shift the transition Δ x =240 mm (18% x / c ) downstream by a TS amplitude reduction of 96 per cent (30 dB). By using an active-wall actuator, which is much shorter than the cascaded system, a transition delay of seven TS wavelengths (16 dB TS amplitude reduction) was reached.

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Xu, Qing Kun, Zhi Qiang Du, and Jun He. "The Design of the Intelligent Voice Recognition System Based on Labview." Applied Mechanics and Materials 734 (February 2015): 383–86. http://dx.doi.org/10.4028/www.scientific.net/amm.734.383.

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The recognition of speech sounds test system based on virtual instrument was designed successfully. For years, virtual instrument has become a huge active communication platform for user, and covered the multiple industries and fields of applications, becoming the data acquisition and instrument control the best choice. Based on the Labview 8.5 software platform, combined with PC sound card, microphones and other hardware acquisition of speech signal, the speech signal is filtered. Through the Hamming window, and power spectrum, the recognition of speech signal is realized. After the actual test and application, software operation is stable and reliable, with certain practicability and value of popularization and application.

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Ito, Rumi, Takahiro Fukumori, Masato Nakayama, and Takanobu Nishiura. "An evaluation on voice intelligibility for factory noise reduction based on integration of active noise control and auditory masking." Journal of the Acoustical Society of America 140, no. 4 (October 2016): 3139. http://dx.doi.org/10.1121/1.4969836.

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Sabzehmeidani, Yaser, Musa Mailah, Tang H. Hing, and Sherif I. Abdelmaksoud. "A Novel Voice-Coil Actuated Mini Crawler for In-Pipe Application Employing Active Force Control With Iterative Learning Algorithm." IEEE Access 9 (2021): 28156–66. http://dx.doi.org/10.1109/access.2021.3058312.

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Oshinoya, Y., H. Arai, and K. Ishibashi. "Active Control of a Small-Vehicle Seat Using a Voice-Coil Motor (Experimental Considerations Using Sliding Mode Control for Single-Degree-of-Freedom Model)." Journal of the Magnetics Society of Japan 28, no. 2 (2004): 140–44. http://dx.doi.org/10.3379/jmsjmag.28.140.

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Struthers, Alison E. C. "Breaking Down Boundaries: Voice and Participation in English Primary Education." International Journal of Children’s Rights 24, no. 2 (July 23, 2016): 434–68. http://dx.doi.org/10.1163/15718182-02402011.

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Pupil voice and active participation form two central elements of international Human Rights Education (hre) provisions. This article draws upon empirical research conducted in primary schools across England to gauge the nature and extent of these processes at classroom and school level and to understand better the reasons for apparent deficiencies in their practice. It argues that whilst there is good practice regarding both concepts, they are nevertheless constrained within tightly controlled boundaries. The underlying reasons for these constraints – including concerns about loss of control and reservations about the value and efficacy of school councils – are explored by drawing upon data from qualitative interviews with teachers. Suggestion is made that in order to break down the boundaries that currently restrict voice and participation, teachers need to become comfortable with the idea of rights respecting learning environments and this will only happen through the provision of hre in their own teacher training.

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Harada, Takashi, and Ke Dong. "Mechanical Design and Control of 3-DOF Active Scanning Probe Using Parallel Link Mechanism." International Journal of Automation Technology 5, no. 2 (March 5, 2011): 86–90. http://dx.doi.org/10.20965/ijat.2011.p0086.

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A 3-DOF active scanning probe using a Parallel Link Mechanism (PLM) is proposed. It employs a small touching force control and can be used for small position sensing devices which works within sizes of few millimeters. The device is attached to the tip of coordinate measuring machines or numerical-control machine tools and used as a scanning probe. In this paper, the characteristics of the mechanism, optimum design, and a control system of the PLM are introduced. The kinematics and differential relations of the PLM are derived. An optimum design for the PLM is proposed as that in which the mechanism’s manipulability is equal in all directions. This implies that the force and position sensitivities of the PLM share an isotropic relationship. A prototype of the PLM is developed. The PLM is constructed on three voice coil motors that are vertically aligned on a base plate, and a sensing stylus is fixed on an end plate. Universal joints with ball bearings are developed for reducing the joint resistance. Position and force control methods for the scanning probe are introduced. For stable scanning motion, a disturbance observer-based mechanical impedance control is formulated. An experimental system for measuring the position of the probe using image processing is developed. It is found that the standard deviation of the positioning error along the z direction is less than 3 µm, whereas those along the x and y directions is larger because of the tilt of the end plate caused by alignment errors of the PLM’s mechanical parts.

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Beavers, John, and Juwon Lee. "Intentionality, scalar change, and non-culmination in Korean caused change-of-state predicates." Linguistics 58, no. 5 (November 26, 2020): 1233–83. http://dx.doi.org/10.1515/ling-2020-0007.

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AbstractThis paper investigates the interpretations of caused change-of-state predicates in Korean, and in particular non-culmination readings in which the result state inherent to the meaning of the predicate fails to obtain either fully (zero result) or partially. We argue that zero result readings require that the subject intended the coming about of the result state, while readings in which some result obtains (partially or completely) lack this entailment. Yet zero result interpretations are not reducible to ‘try’-constructions since the former but not the latter require the direct causation. Furthermore, zero result readings arise only in active voice, a grammatical constraint not explicitly discussed for other languages. We argue that the full suite of possible readings arises from two factors: a sublexical modality over worlds conforming to the agent’s intentions for zero result readings that arises from a special active voice inflection in Korean and a scalar semantics for change-of-state verbs that derives partial result readings as a type of degree achievement interpretation. An interaction of these two factors produce the range of possible readings for Korean change-of-state predicates. Finally, we discuss our account in relation to the Agent Control Hypothesis of Demirdache and Martin (2015) that agentivity properties of the subject are necessary for certain non-culmination readings, and suggest that Korean exemplifies the ACH provided that what counts as “control” includes intentionality.

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Oe, Katsutoshi. "An Electrolarynx Control Method Using Myoelectric Signals from the Neck." Journal of Robotics and Mechatronics 33, no. 4 (August 20, 2021): 804–13. http://dx.doi.org/10.20965/jrm.2021.p0804.

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Patients who have lost vocal cord function due to laryngeal cancer or laryngeal injury are incapable of speech because it is impossible to generate the laryngeal tone from which the voice originates. For such patients, various speech production substitutes have been devised and put into practical use. The electrolarynx is one of these speech production substitutes and it can be used with relative ease. However, the sound is sometimes difficult to hear and its quality is monotonous. Therefore, focusing on the control method to improve the articulation of the electrolarynx, we have proposed an electrolarynx controlled by myoelectric signals of the neck. The sternohyoid muscle, which is located in the superficial layer of the neck, was the source of the myoelectric signals. This muscle is active during speech, and its activity increases mainly at the time of speech in a low voice. We succeeded in detecting the surface myoelectric signals of the sternohyoid muscle and performing on/off control of the electrolarynx by signal processing. This report includes the derivation of a control function for converting into a control signal of the fundamental frequency of the electrolarynx from the relationship between the myoelectric signals and the fundamental frequency of the voice. This report also includes an evaluation of the controllability of the electrolarynx by comparing the obtained control signal with the user’s intention. Regarding the control of the fundamental frequency, we have proposed a method of control in three stages – high, medium, and low – and a method of control in two stages – high and low – and compared their performances. The results of the three-stage control indicated that the use of the logarithm as a control function for converting the myoelectric signals into the fundamental frequency of the electrolarynx succeeded in the control at an accuracy of 90% or more by changing the pitch of the generated sound depending on the subjects. It was also indicated that the error rate was as low as less than 20%, while maintaining a constant sound. This makes it clear that the use of the logarithm as a control function gives the highest controllability. The two-stage control exhibits a very high control success rate exceeding 90%, regardless of the type of control function; in particular, the control function using the logarithm exhibits a control success rate exceeding 95%. These results indicate that the electrolarynx control function obtained using the logarithmic function has excellent controllability.

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Behroozmand, Roozbeh, Hanjun Liu, and Charles R. Larson. "Time-dependent Neural Processing of Auditory Feedback during Voice Pitch Error Detection." Journal of Cognitive Neuroscience 23, no. 5 (May 2011): 1205–17. http://dx.doi.org/10.1162/jocn.2010.21447.

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The neural responses to sensory consequences of a self-produced motor act are suppressed compared with those in response to a similar but externally generated stimulus. Previous studies in the somatosensory and auditory systems have shown that the motor-induced suppression of the sensory mechanisms is sensitive to delays between the motor act and the onset of the stimulus. The present study investigated time-dependent neural processing of auditory feedback in response to self-produced vocalizations. ERPs were recorded in response to normal and pitch-shifted voice auditory feedback during active vocalization and passive listening to the playback of the same vocalizations. The pitch-shifted stimulus was delivered to the subjects' auditory feedback after a randomly chosen time delay between the vocal onset and the stimulus presentation. Results showed that the neural responses to delayed feedback perturbations were significantly larger than those in response to the pitch-shifted stimulus occurring at vocal onset. Active vocalization was shown to enhance neural responsiveness to feedback alterations only for nonzero delays compared with passive listening to the playback. These findings indicated that the neural mechanisms of auditory feedback processing are sensitive to timing between the vocal motor commands and the incoming auditory feedback. Time-dependent neural processing of auditory feedback may be an important feature of the audio-vocal integration system that helps to improve the feedback-based monitoring and control of voice structure through vocal error detection and correction.

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Nöcker-Ribaupierre, Monika, Otwin Linderkamp, and Klaus P. Riegel. "The Effects of Mothers’ Voice on the Long Term Development of Premature Infants: A Prospective Randomized Study." Music and Medicine 7, no. 3 (July 31, 2015): 20. http://dx.doi.org/10.47513/mmd.v7i3.406.

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Language acquisition appears to begin during fetal life. This is substantiated by the fact that the fetus recognizes and remembers the voice and melody of the mother's language. We hypothesized that Auditory Stimulation of preterm infants with their mothers' voice may also improve their language and overall development. 24 preterm infants were exposed on a daily basis 5 times for 30 minutes to the recorded voice of their mothers for 6 to 10 weeks beginning 1 to 3 weeks after birth. A control group of 24 infants (with comparable intensive care standards) had similar gestational age (24-30 weeks) and birth weight (650-1440g) as the treatment group. Developmental tests were done at the post-term age of 5 and 20 months (Griffiths Development Quotient), at 56 months (Columbia Mental Maturity Scales, active vocabulary; and a logopedic test of understanding) and 6 years (understanding and construct of sentences). Early developmental parameters were logged by the mothers upon discharge, through their use of a daily diary. This included assessment inquiries related to breastfeeding and mood. At 5 months of age, the Griffiths Development Quotient was significantly (p=0.007) higher in the stimulated infants (95± 15) when compared with the controls (80±20). Stimulated infants began earlier than the controls to use two-word sentences (17 vs. 20 months), in the same range than time-born infants; at 6 years the subtest "speech understanding” was significantly better in the stimulated group than in the controls (p<0.05). The mothers of the stimulated infants reported less burden and showed more stability. They breastfed their babies at 5 months after full term significantly more often as compared to controls (50% vs. 12.5%). Auditory Stimulation of preterm infants using recordings of mothers' voice appears to improve emotional stability of the mothers and development of their preterm infants. In particular, development of speech and understanding appears to improve through 6 years of postnatal age.

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Ikeda, Keigo, Ayato Endo, Ryosuke Minowa, Hideaki Kato, and Takayoshi Narita. "A basic study on influence of jerk on riding comfort using active seat suspension for ultra-compact mobility." International Journal of Applied Electromagnetics and Mechanics 64, no. 1-4 (December 10, 2020): 1505–13. http://dx.doi.org/10.3233/jae-209471.

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In the current automobile industry, the demand for ultra-compact vehicles as a means of transportation for elderly people and other travelers, has been increasing. The effect of vibration on the ride comfort of these vehicles is significant because of their small size and low weight. The vibration will increase the discomfort perceived by persons in the vehicle. Therefore, it is necessary to develop a vibration control system for safe and comfortable driving. To improve ride comfort, this research group proposed an active seat suspension using a voice coil motor at the seat section of the vehicle. In this study, the influence of jerk on the psychological state, which was obtained from bioinstrumentation, was investigated.

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Stuart, Howard, Nilay Ozen, and Vivian Petropoulos. "Can Doctors Still Have a Voice in Healthcare?" International Journal of Whole Person Care 7, no. 1 (January 15, 2020): 14. http://dx.doi.org/10.26443/ijwpc.v7i1.215.

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In the fall of 2014 the Quebec Health Ministry announced plans for a broad restructuring of the entire Healthcare network, implemented shortly thereafter in 2015. The effect on institutions was dramatic and immediate. Local management was eradicated, concentrating and centralizing control of the entire system ultimately into the office of the Minister. With the abrupt reorganization of services came relocation of large numbers of personnel. Management at a distance became the norm. In many institutions, the commonly held view among physicians with regard to relations with management can be summarized as, “Suddenly there was no one to talk to.”Confusion and tension were prevalent and palpable. In this context, in attempt to have a voice, a group of physicians at one community hospital formed an independent organization. It developed into an influential body which continues to remain active. This workshop will use the experiences and reflections of physicians from that organization as a basis to explore questions such as: -Is there a difference between Health Services and Health Care? Do we care? -Does worker engagement matter in Healthcare delivery? Or are good systems and modern equipment all we really need? -Does sense of community matter within a healthcare institution? If so why?If it matters, is it just for the benefit of those working for the organization? Or is there a benefit for the users too? -What is the basis for sense of community? Where does it come from? Can it be destroyed? Can it be developed? -Is there an importance to the quality of relationships between people working within Healthcare? Do these relationships have impact on quality of care? -Should the perspective of those working in the system be incorporated input Management decision making? If so how? -What can physicians, nurses and other allied Healthcare professionals do in order to have a voice?

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Jiang, Dawei, Jiasheng Li, Xingzhan Li, Chaodong Deng, and Pinkuan Liu. "Modeling identification and control of a 6-DOF active vibration isolation system driving by voice coil motors with a Halbach array magnet." Journal of Mechanical Science and Technology 34, no. 2 (February 2020): 617–30. http://dx.doi.org/10.1007/s12206-019-1208-y.

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Qian, Junbing, Liping Bao, and Chuankun Ji. "Modeling and analysis of the disturbance about an active vibration isolation system." Sensor Review 38, no. 2 (March 19, 2018): 207–15. http://dx.doi.org/10.1108/sr-04-2017-0061.

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Purpose Precision active vibration isolation system (AVIS) is crucial for the mechanical processing equipment in the field of precision manufacturing. Working reliability and efficiency of the system directly influence operating condition of the equipment and the quality of work pieces. Design/methodology/approach A complete structure of the AVIS includes two parts: the excitation part and the passive vibration isolation system (PVIS). The excitation part consists of voice coil motors (VCMs). In this paper, the working process of AVIS is studied particularly via linear simplification on the decoupling model and the mechanical dynamic equations to solve the vibration problem, and they are validated by the experiments. Findings According to dynamic analysis and experiment on an AVIS on different reference points, the VCMs are used as actuators in the AVIS to excite the PVIS, and the performance characteristics of the whole AVIS is well reflected by the amplitude–frequency curves, the bode diagrams and the power spectral density curves. Originality/value This study has provided a way for obtaining the inner structure and working condition of the AVIS, which are essential to better control of the AVIS and to further study it in precision manufacturing application.

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Debra, E. Bardine, F. Wallace Daniel, Udo Goff, and Christine Schlichting. "Shipboard Communications: Quantifying Operator Capabilities and Limitations." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 46, no. 23 (September 2002): 1900–1904. http://dx.doi.org/10.1177/154193120204602307.

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As the United States Navy moves towards a reduction in manning aboard future ships, the number and complexity of tasks the warfighter must perform remains high. One responsibility of the warfighter that is very taxing on his/her audio channel is the handling of voice communications. To determine the “breaking point” in handling these voice communications, researchers used a fully developed scenario to test the capabilities and limitations of typical Navy watchstanders when subjected to a varying number of active communications circuits. Metrics such as accuracy and latency of response were used to measure human performance. In addition, a between-subject experiment was used to determine whether or not a simulated speech-to-text tool would help to improve warfighter performance on a communications task, while not degrading performance on a primary, tactical task. The experiment was performed in the Integrated Command Environment (ICE) lab at NAVSEA Dahlgren, a testbed for future command and control concepts and a vehicle to solicit valuable feedback from members of the fleet.

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FILIPPI, ROBERTO, JOHN MORRIS, FIONA M. RICHARDSON, PETER BRIGHT, MICHAEL S. C. THOMAS, ANNETTE KARMILOFF-SMITH, and VIORICA MARIAN. "Bilingual children show an advantage in controlling verbal interference during spoken language comprehension." Bilingualism: Language and Cognition 18, no. 3 (October 14, 2014): 490–501. http://dx.doi.org/10.1017/s1366728914000686.

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Studies measuring inhibitory control in the visual modality have shown a bilingual advantage in both children and adults. However, there is a lack of developmental research on inhibitory control in the auditory modality. This study compared the comprehension of active and passive English sentences in 7–10 years old bilingual and monolingual children. The task was to identify the agent of a sentence in the presence of verbal interference. The target sentence was cued by the gender of the speaker. Children were instructed to focus on the sentence in the target voice and ignore the distractor sentence. Results indicate that bilinguals are more accurate than monolinguals in comprehending syntactically complex sentences in the presence of linguistic noise. This supports previous findings with adult participants (Filippi, Leech, Thomas, Green & Dick, 2012). We therefore conclude that the bilingual advantage in interference control begins early in life and is maintained throughout development.

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Watanabe, Takayuki. "Case study for voice amplification in a highly absorptive conference room using a negative absorption tuning by the Yamaha Active Field Control system." Journal of the Acoustical Society of America 120, no. 5 (November 2006): 3359–60. http://dx.doi.org/10.1121/1.4781487.

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Frey, Aline, Clément François, Julie Chobert, Jean-Luc Velay, Michel Habib, and Mireille Besson. "Music Training Positively Influences the Preattentive Perception of Voice Onset Time in Children with Dyslexia: A Longitudinal Study." Brain Sciences 9, no. 4 (April 21, 2019): 91. http://dx.doi.org/10.3390/brainsci9040091.

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Previous results showed a positive influence of music training on linguistic abilities at both attentive and preattentive levels. Here, we investigate whether six months of active music training is more efficient than painting training to improve the preattentive processing of phonological parameters based on durations that are often impaired in children with developmental dyslexia (DD). Results were also compared to a control group of Typically Developing (TD) children matched on reading age. We used a Test–Training–Retest procedure and analysed the Mismatch Negativity (MMN) and the N1 and N250 components of the Event-Related Potentials to syllables that differed in Voice Onset Time (VOT), vowel duration, and vowel frequency. Results were clear-cut in showing a normalization of the preattentive processing of VOT in children with DD after music training but not after painting training. They also revealed increased N250 amplitude to duration deviant stimuli in children with DD after music but not painting training, and no training effect on the preattentive processing of frequency. These findings are discussed in view of recent theories of dyslexia pointing to deficits in processing the temporal structure of speech. They clearly encourage the use of active music training for the rehabilitation of children with language impairments.

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Duong, Mai. "The Formation of Network Society in Vietnam: Promise or Peril?" Asiascape: Digital Asia 6, no. 1-2 (April 29, 2019): 17–34. http://dx.doi.org/10.1163/22142312-12340100.

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Abstract Empowered by information technology, the Vietnamese online community is becoming the most progressive and active social group in Vietnam. Using network society theory developed by Manuel Castells, this article investigates the impact of Facebook on the formation of cyber-networks in which internet users access uncensored information and voice their opinions about politics and everyday life. My arguments are based on an analysis of blogs, online discussion groups, and semi-structured interviews with Vietnamese activists, bloggers, and journalists. While the Vietnamese authorities struggle to find ways to control the dynamism of the developing cyber-society, these networks are leading Vietnamese netizens into the habit of using new media such as Facebook to become familiar with the basic values of cyber-democracy.

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Lento, Camillo. "Promoting active learning in introductory financial accounting through the flipped classroom design." Journal of Applied Research in Higher Education 8, no. 1 (February 1, 2016): 72–87. http://dx.doi.org/10.1108/jarhe-01-2015-0005.

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Purpose – The purpose of this paper is to describe a classroom design for introductory financial accounting that promotes active learning through a flipped classroom approach. A course learning management system, white-board voice-over video applications, an online homework manager and online tutorials pre-packaged with the course textbook were all adopted to facilitate the flipped classroom. The in-class sessions were refocussed around active learning strategies, including case analysis, concept mapping, solving comprehensive problems, mini lectures with bookends, and small group discussions. Design/methodology/approach – A quasi-experimental design, combined with student surveys, are utilized. A Wilcoxon rank-sum test is used to assess the significance of any difference in student performance between a lecture-based course (control group, n=92) and the flipped classroom course (experimental group, n=97). Student performance is measured based on final exams and overall course grades. Findings – The results suggest that the flipped classroom improved student grade point averages, final exam performance, and pass rates. Both the stronger and weaker students benefited from the technologies and active learning strategies adopted in the flipped classroom. Originality/value – This is the first known study to investigate the efficacy of promoting active learning in introductory financial accounting through a flipped classroom design. This study is valuable for accounting educators, and educators in other similarly technical disciplines, who seek to combat the high failure rates that typically plague complex, technical introductory courses.

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Shinshi, Tadahiko, Daisuke Shimizu, Kazuhide Kodeki, and Kazuhiko Fukushima. "A Fast Steering Mirror Using a Compact Magnetic Suspension and Voice Coil Motors for Observation Satellites." Electronics 9, no. 12 (November 25, 2020): 1997. http://dx.doi.org/10.3390/electronics9121997.

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Fast steering mirrors (FSMs) are used to correct images observed by satellites. FSMs need to have large apertures and realize high precision and the positioning of the mirror in the tip-tilt and axial directions needs to be highly precise and highly responsive in order to capture large-scale, high-resolution images. An FSM with a large-diameter mirror supported by a compact magnetic suspension and driven by long-stroke voice coil motors (VCMs) is proposed in this paper. The magnetic suspension and VCM actuators enable the mirror to be highly responsive and to have long-range movement in the tip-tilt and axial directions without friction and wear. The magnetic suspension is a hybrid that has active control in the lateral directions and passive support in the tip-tilt and axial directions. An experimental FSM with an 80 mm diameter dummy mirror was fabricated and tested. The mirror’s driving ranges in the tip-tilt and axial directions were ±20 mrad and ±500 μm, respectively. Furthermore, the servo bandwidths in the tip-tilt and axial directions were more than 1 kHz and 200 Hz, respectively.

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Journal articles on the topic 'Active voice control'

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