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Journal articles on the topic 'Octave band filter'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Merritt, Ronald. "Normalized Error Estimates for One-Third Octave Band Filter Processing." Journal of the IEST 47, no. 1 (2004): 87–93. http://dx.doi.org/10.17764/jiet.47.1.f33v521425712km6.

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This paper summarizes numerically derived theoretical estimates of normalized random and normalized bias errors for one-third octave band filters applied to autoregressive processes of order two. It demonstrates that one-third octave band estimates of such processes may have substantial bias errors depending upon (1) frequency location of a true spectra peak relative to the center frequency of the one-third octave band filter and (2) half-power bandwidth of the true spectra. One-third octave band processing error is contrasted with narrowband processing error. It concludes that one-third octav

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2

Zhang, Shuai, Yong Xiang Zhang, and Jie Ping Zhu. "Rolling Bearing Feature Extraction Based on Wavelet Filtering with Optimal Combination Bands." Applied Mechanics and Materials 599-601 (August 2014): 434–40. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.434.

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In order to select the band-pass filter parameters reasonably, a new method of rolling bearing feature extraction based on wavelet filtering with optimal combination bands is proposed. Filter banks with different number of filter/octave are constructed by Morlet wavelet, which are used to filter the signal. The filters with the optimal frequency-band are selected according to the kurtosis of the filtered signal. Then, the optimal band filters in each filter bank are combined to filter the signals and the feature extraction is available. Through simulation and experimental verification, results

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Zhang, Zhong, Hiroshi Toda, Takashi Imamura, and Tetsuo Miyake. "A novel variable filter band discrete wavelet transform: Theory and principle." International Journal of Wavelets, Multiresolution and Information Processing 12, no. 04 (2014): 1460006. http://dx.doi.org/10.1142/s0219691314600066.

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It is well-known that a mother wavelet for the discrete wavelet transform (DWT) has the band-pass filter characteristic with octave width in the frequency domain and can be used for octave analysis. However, it is possible that the octave analysis is not necessarily the most suitable to match the analysis signal. In this study, in order to construct the most suitable basis to match the analysis signal, a novel variable-filter band discrete wavelet transform (VFB-DWT) is proposed. It is achieved by using variable-band filters instead of conventional decomposition and reconstruction sequences, w

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4

Rämö, Jussi, Juho Liski, and Vesa Välimäki. "Third-Octave and Bark Graphic-Equalizer Design with Symmetric Band Filters." Applied Sciences 10, no. 4 (2020): 1222. http://dx.doi.org/10.3390/app10041222.

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This work proposes graphic equalizer designs with third-octave and Bark frequency divisions using symmetric band filters with a prescribed Nyquist gain to reduce approximation errors. Both designs utilize an iterative weighted least-squares method to optimize the filter gains, accounting for the interaction between the different band filters, to ensure excellent accuracy. A third-octave graphic equalizer with a maximum magnitude-response error of 0.81 dB is obtained, which outperforms the previous state-of-the-art design. The corresponding error for the Bark equalizer, which is the first of it

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5

Palagi, P. M., and A. Guérin-Dugué. "Simulation of Cortex Visual Cells for Texture Segmentation: Foveal and Parafoveal Projections." Perception 25, no. 1_suppl (1996): 120. http://dx.doi.org/10.1068/v96l0708.

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The objective of this work is to simulate visual cortical cells, their sensitivities to frequencies and orientations, and their part in texture segmentation. The simulation of these cells is realised through band-pass, oriented filters (Gabor filters), and multiresolution image decomposition. By this means, the filter sensitivities represent cell sensitivities to preferred orientations according to their frequency and orientation bandwidths, and multiresolution represents the different band frequencies. For texture analysis and segmentation, overlaying of band-pass filters is necessary to comp

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6

Toda, Hiroshi, Zhong Zhang, and Takashi Imamura. "Perfect-translation-invariant variable-density complex discrete wavelet transform." International Journal of Wavelets, Multiresolution and Information Processing 12, no. 04 (2014): 1460001. http://dx.doi.org/10.1142/s0219691314600017.

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The theorems giving the conditions for discrete wavelet transforms (DWTs) to achieve perfect translation invariance (PTI) have already been proven, and based on these theorems, the dual-tree complex DWT and the complex wavelet packet transform, achieving PTI, have already been proposed. However, there is not so much flexibility in their wavelet density. In the frequency domain, the wavelet density is fixed by octave filter banks, and in the time domain, each wavelet is arrayed on a fixed coordinate, and the wavelet packet density in the frequency domain can be only designed by dividing an octa

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7

Horta, Miguel A., and Marco A. Vazquez. "PC interface for a stepped filter octave band analyzer." Journal of the Acoustical Society of America 112, no. 5 (2002): 2234. http://dx.doi.org/10.1121/1.4778853.

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Matsumoto, Yasunao, Yukio Takahashi, Setsuo Maeda, Hiroki Yamaguchi, Kazuhiro Yamada, and Jishnu K. Subedi. "An Investigation of the Perception Thresholds of Band-Limited Low Frequency Noises: Influence of Bandwidth." Journal of Low Frequency Noise, Vibration and Active Control 22, no. 1 (2003): 17–25. http://dx.doi.org/10.1260/026309203769018059.

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Perception thresholds of complex low frequency noises have been investigated in a laboratory experiment. Sound pressure levels that were just perceptible by subjects were measured for three complex noises and three pure tones. The complex noises had a flat constant spectrum over the frequency range 2 to 10, 20, or 40 Hz and decreased at 15 dB per octave at higher frequencies. The frequencies of the pure tones used in this study were 10, 20 and 40 Hz. The perception thresholds were obtained using an all-pass filter, one-third octave band filters, and the G frequency weighting defined in ISO 719

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9

Elias, Elizabeth, Per Löwenborg, Håkan Johansson, and Lars Wanhammar. "Tree-structured IIR/FIR uniform-band and octave-band filter banks with very low-complexity analysis or synthesis filters." Signal Processing 83, no. 9 (2003): 1997–2009. http://dx.doi.org/10.1016/s0165-1684(03)00131-2.

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10

Serrano-Pedraza, Ignacio, and Vicente Sierra-Vázquez. "The Effect of White-Noise Mask Level on Sinewave Contrast Detection Thresholds and the Critical-Band-Masking Model." Spanish Journal of Psychology 9, no. 2 (2006): 249–62. http://dx.doi.org/10.1017/s1138741600006156.

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It is known that visual noise added to sinusoidal gratings changes the typical U-shaped threshold curve which becomes flat in log-log scale for frequencies below 10c/deg when gratings are masked with white noise of high power spectral density level. These results have been explained using the critical-band-masking (CBM) model by supposing a visual filter-bank of constant relative bandwidth. However, some psychophysical and biological data support the idea of variable octave bandwidth. The CBM model has been used here to explain the progressive change of threshold curves with the noise mask lev

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11

Qian, Lei, and Xiang Ning Fan. "Design of an Active-Gm-RC Reconfigurable Filter for the Multi-Mode Receiver." Applied Mechanics and Materials 364 (August 2013): 458–62. http://dx.doi.org/10.4028/www.scientific.net/amm.364.458.

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Based on TSMC 0.18m RF CMOS process a reconfigurable low-pass filter (LPF) is presented in this paper. The LPF adopts active-Gm-RC structure. By manually adjusting the capacitor arrays, the LPF can switch working mode and correct frequency offset caused by process deviation. The pre-layout simulation shows that with 1.8V power supply, the bandwidth ranges from 1.4MHz to 9.8MHz with a step of 1.4MHz. The out of band attenuation is about-80dB/10 octave and the power consumption is 0.43mW .

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12

Sundukov, A. E. "Argumentation of filter width selection with the use of envelope spectrum in vibration diagnostics of rotary machine defects." VESTNIK of Samara University. Aerospace and Mechanical Engineering 19, no. 3 (2020): 100–108. http://dx.doi.org/10.18287/2541-7533-2020-19-3-100-108.

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The paper shows certain ambiguity of the narrow-band boundary of random processes obtained by different authors. The use of filters of different widths in obtaining the envelope spectrum makes it difficult to compare the obtained results by estimating the depth of amplitude modulation in vibration diagnostics of defects in rotary machines. We studied the results of bandpass filtering of the noise process only, as well as of amplitude-modulated noise. The analysis of the results of filtering of a broadband normal random process with constant spectral density and the representation of the spectr

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13

Wang, Yi Xiao, Ya Nan Li, Yi Wang, Xiao Dong Chen, and Dao Yin Yu. "Automatic Monitoring System on Embedded Platform for Environmental Noise Detection." Advanced Materials Research 403-408 (November 2011): 1507–10. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.1507.

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A novel system based on embedded platform for environmental noise monitoring is presented in this paper. The system is designed by ARM and DSP to implement data collection and processing respectively, as a substitute for conventional MCU and DSP structure. The DSP is used as the core processor to implement a high precision IIR filter for 1/3 octave band spectral analysis in real time. The noise data detected beyond the reference value can be processed and stored automatically, and the noise pollution sources can be identified in time by the images captured by an USB camera on the terminal. The

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14

Liu, Chih-Wei, Kuo-Chiang Chang, Ming-Hsun Chuang, and Ching-Hao Lin. "10-ms 18-Band Quasi-ANSI S1.11 1/3-Octave Filter Bank for Digital Hearing Aids." IEEE Transactions on Circuits and Systems I: Regular Papers 60, no. 3 (2013): 638–49. http://dx.doi.org/10.1109/tcsi.2012.2209731.

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15

Liu, Chih-Wei, Chia-Kai Chan, Po-Hsiang Cheng, and Hsin-Yuan Lin. "FFT-Based Multirate Signal Processing for 18-Band Quasi-ANSI S1.11 1/3-Octave Filter Bank." IEEE Transactions on Circuits and Systems II: Express Briefs 66, no. 5 (2019): 878–82. http://dx.doi.org/10.1109/tcsii.2019.2909650.

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16

Mackersie, Carol L., Tracy L. Crocker, and Rebecca A. Davis. "Limiting High-Frequency Hearing Aid Gain in Listeners with and without Suspected Cochlear Dead Regions." Journal of the American Academy of Audiology 15, no. 07 (2004): 498–507. http://dx.doi.org/10.3766/jaaa.15.7.4.

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The purpose of this study was to compare threshold-matched ears with and without suspected cochlear dead regions in terms of the speech perception benefit from high-frequency amplification. The Threshold Equalizing Noise Test (TEN) was used to assess the presence of dead regions. Speech perception was measured while participants were wearing a hearing aid fit to approximate DSL[i/o] targets. Consonant identification of nonsense vowelconsonant-vowel combinations was measured in quiet using a forced-choice procedure. Phoneme recognition was measured at signal-to-noise ratios ranging from 0 to +1

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17

Nuttall, Helen E., David R. Moore, Johanna G. Barry, Katrin Krumbholz, and Jessica de Boer. "The influence of cochlear spectral processing on the timing and amplitude of the speech-evoked auditory brain stem response." Journal of Neurophysiology 113, no. 10 (2015): 3683–91. http://dx.doi.org/10.1152/jn.00548.2014.

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The speech-evoked auditory brain stem response (speech ABR) is widely considered to provide an index of the quality of neural temporal encoding in the central auditory pathway. The aim of the present study was to evaluate the extent to which the speech ABR is shaped by spectral processing in the cochlea. High-pass noise masking was used to record speech ABRs from delimited octave-wide frequency bands between 0.5 and 8 kHz in normal-hearing young adults. The latency of the frequency-delimited responses decreased from the lowest to the highest frequency band by up to 3.6 ms. The observed frequen

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18

Sekino, Hideo, Akihide Miyazaki, and Hiroshi Toda. "An analysis of music sound by a 12 even-tempered discrete wavelet." International Journal of Wavelets, Multiresolution and Information Processing 12, no. 04 (2014): 1460009. http://dx.doi.org/10.1142/s0219691314600091.

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Music sounds are analyzed using a 12 even-tempered wavelet based upon the variable-density perfect translation invariance complex discrete wavelet transform (VD-PTI-CDWT) which divides an octave frequency band into 12 filter banks of equivalent width. Music chords generated from different sound sources thus analyzed are represented as scalogram and in 3 dimension (3D) graph over time-frequency domain. The scalogram representation provides information corresponding to the western music notation and accords with human's cognition for pitch of the music sound whereas 3D graph representation is ca

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19

Wu, Denghao, Zhibing Zhu, Yun Ren, Yunqing Gu, Jiegang Mou, and Shuihua Zheng. "Integrated topology optimization for vibration suppression in a vertical pump." Advances in Mechanical Engineering 11, no. 3 (2019): 168781401983268. http://dx.doi.org/10.1177/1687814019832689.

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This article presents a new approach aiming to reducing pump vibration by modifying its baseplate structure. The finite element models of the vertical pump were established and validated by the experimental impact test. The natural frequencies of pump were mapped in both experimental and numerical methods. The weak stiffness of the baseplate was identified as the root cause for the pump vibration. A topology optimization was used for enhancing the stiffness of baseplate and controlling its weight. The new baseplate was designed according to the inputs from optimization results and manufactured

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20

Fanigliulo, Roberto, Lindoro Del Duca, Laura Fornaciari, Renato Grilli, Roberto Tomasome, and Danieele Pochi. "Efficiency of an ANC system in the tractor cabin under controlled engine workload." Noise Control Engineering Journal 68, no. 5 (2020): 339–57. http://dx.doi.org/10.3397/1/376829.

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The noise at the driver seat of an agricultural tractor is produced mostly by the engine. Its characteristic broadband noise spectrum varies considerably with engine workload. The passive noise control techniques adopted in tractor cabins, based on the application of sound-absorbing and sound-proofing materials, are effective against medium-high frequencies noise components. The residual noise in sound-proof cabins is characterized by tonal emissions with low frequency components (< 500 Hz) but regarded as responsible for various disorders and diseases following long-term exposure. In addit

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21

Antoni, Jérôme. "Orthogonal-like fractional-octave-band filters." Journal of the Acoustical Society of America 127, no. 2 (2010): 884–95. http://dx.doi.org/10.1121/1.3273888.

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22

Marbjerg, Gerd, Jonas Brunskog, Cheol-Ho Jeong, and Valentina Zapata-Rodriguez. "The Influence of Overlapping Band Filters on Octave Band Decay Curves." Acta Acustica united with Acustica 104, no. 6 (2018): 943–46. http://dx.doi.org/10.3813/aaa.919259.

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23

Park, Choonbyong, and Ross A. Black. "Simple time‐variant, band‐pass filtering by operator scaling." GEOPHYSICS 60, no. 5 (1995): 1527–35. http://dx.doi.org/10.1190/1.1443885.

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A convolutional method of time‐variant, band‐pass filtering presented shows that a change of filter cutoff frequencies with time is achieved by frequency scaling the amplitude spectrum of a reference operator. According to the scaling property of the Fourier transform, this frequency scaling is actually accomplished by a simple time‐domain scaling of the reference operator in which the filter operator at a sample point on a seismogram is obtained by compressing the reference operator after multiplication by a constant value. Therefore, the length of filter operator changes as the cutoff freque

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24

KOH, MIN-SUNG, DANILO P. MANDIC, and ANTHONY G. CONSTANTINIDES. "THEORY OF DIGITAL FILTER BANKS REALIZED VIA MULTIVARIATE EMPIRICAL MODE DECOMPOSITION." Advances in Adaptive Data Analysis 06, no. 01 (2014): 1450001. http://dx.doi.org/10.1142/s1793536914500010.

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Undecimated and decimated multivariate empirical mode decomposition filter banks (MEMDFBs) are introduced in order to incorporate MEMD equipped with downsampling into any arbitrary tree structure and provide flexibility in the choice of frequency bands. Undecimated MEMDFBs show the same results as those of original MEMD for an octave tree structure. Since the exact cut-off frequencies of MEMD are not known (i.e. due to data-driven decomposition), employing just simple downsampling in MEMD might cause aliasing. However, decimated MEMDFBs in this paper achieve perfect reconstruction with aliasin

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25

Milosevic, Vojislav, Radovan Bojanic, and Branka Jokanovic. "Analytical modeling of antisymmetric split-ring resonators coupled with transmission line." International Journal of Microwave and Wireless Technologies 11, no. 4 (2019): 359–67. http://dx.doi.org/10.1017/s1759078719000308.

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AbstractCoupled-mode theory is applied to obtain an analytic form of scattering parameters for a class of transmission line metamaterials with antisymmetric split-rings. The same structure is modeled with equivalent circuit, which includes electric and magnetic coupling with the line and inter-resonator coupling. Modified even/odd analysis is used to obtain scattering parameters from the equivalent circuit. These two methods are shown to be equivalent in a narrow band, and their constants related. The obtained results are compared with full-wave simulations and measurements, and it is shown th

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26

PALENSKIS, VILIUS, JONAS MATUKAS, SANDRA PRALGAUSKAITĖ, and BRONIUS SAULYS. "A DETAIL ANALYSIS OF ELECTRICAL AND OPTICAL FLUCTUATIONS OF GREEN LIGHT-EMITTING DIODES BY CORRELATION METHOD." Fluctuation and Noise Letters 09, no. 02 (2010): 179–92. http://dx.doi.org/10.1142/s0219477510000149.

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A detail analysis of electrical and optical fluctuations of large power (1 W) green light-emitting diodes (LEDs) is presented. Special attention was directed to measurement and interpretation of correlation coefficient between electrical and optical fluctuations. The correlation coefficient was measured not only over frequency range from 10 Hz to 20 kHz, but also in every one-octave frequency band by using digital filters. It is shown that correlated part of electrical and optical fluctuations for investigated green LEDs is related with random potential fluctuations of parameters of quantum we

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27

Eagle, Richard A. "Independent Processing across Spatial Frequency in Moving Broadband Patterns." Perception 26, no. 8 (1997): 961–76. http://dx.doi.org/10.1068/p260961.

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The aim of the experiments was to discover whether the visual system has independent access to motion information at different spatial scales when presented with a broadband stimulus. Subjects were required to discriminate between a pair of two-frame motion sequences, one containing a coherently displacing pattern and the other containing a pattern with high-frequency noise. The stimuli were either narrowband (1 octave) or broadband (6 octaves spanning 0.23–15.0 cycles deg−1) and their power spectra were either flat or followed a 1 /f2 function. For the broadband stimuli, noise was introduced

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28

Farrell Luka, Moses, and Ertan Akun. "Noise exposure and induced hearing loss to workers in small and large scale industries." International Journal of Engineering & Technology 7, no. 4.5 (2018): 571. http://dx.doi.org/10.14419/ijet.v7i4.5.21159.

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The purpose of this research is to determine the level of noise exposure to workers and to recommend how to manage the occupational high level of noise, understanding the workers noise exposure and providing personal ear protectors is the responsibility of employers. After visiting almost all the industries it was noticed that none of these industries are following these requirements. Knowing that expo- sure to excessive noise can cause health problems including temporary or permanent hearing loss, concentration problems, stress, nerv- ousness, sleeping problems and fatigue. The noise levels w

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29

Brady, Nuala. "Spatial Scale Interactions and Image Statistics." Perception 26, no. 9 (1997): 1089–100. http://dx.doi.org/10.1068/p261089.

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In natural scenes and other broadband images, spatial variations in luminance occur at a range of scales or frequencies. It is generally agreed that the visual image is initially represented by the activity of separate frequency-tuned channels, and this notion is supported by physiological evidence for a stage of multi-resolution filtering in early visual processing. The question whether these channels can be accessed as independent sources of information in the normal course of events is a more contentious one. In the psychophysical study of both motion and spatial vision, there are examples

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30

Palmer, A. R., D. Jiang, and D. H. Marshall. "Responses of ventral cochlear nucleus onset and chopper units as a function of signal bandwidth." Journal of Neurophysiology 75, no. 2 (1996): 780–94. http://dx.doi.org/10.1152/jn.1996.75.2.780.

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1. The responses of units in the ventral cochlear nucleus in anesthetized guinea pigs have been measured to best-frequency tones, noise bands geometrically centered around the unit best frequency, and noise bands asymmetrically positioned around the best frequency. 2. Each unit isolated was characterized using peristimulus time histograms (PSTHs) to best-frequency tones at 20 and 50 dB suprathreshold, frequency-intensity response areas and rate-versus-level functions in response to best-frequency tones and wideband noise. The data reported here are derived from full analyses of 5 chopper units

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31

Bjor, Ole‐Herman, and Gustav Ese. "Measuring the sound power of a noise source and detecting pure tones with a single instrument combining true 1/3 octave band digital filters and an FFT analyzer." Journal of the Acoustical Society of America 82, S1 (1987): S113. http://dx.doi.org/10.1121/1.2024588.

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32

Shakya, Sandhya, and Jyotsna V. Ogale. "Design and Analysis of Uniform-Band and Octave-Band Tree-Structured Filter Bank." International Journal of Signal Processing Systems 4, no. 2 (2015). http://dx.doi.org/10.12720/ijsps.4.2.162-167.

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33

Kozak, Andrii Vitaliiovych. "Improved Unmanned Aerial Vehicle Noise Direction Finding System." Electronic and Acoustic Engineering 4, no. 1 (2021). http://dx.doi.org/10.20535/2617-0965.eae.228902.

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The work is devoted to the development of the acoustic direction of creation of means of detection of unmanned aerial vehicles (UAVs). The work of these tools is based on the principles of noise direction finding with the use of such variable characteristics of the acoustic field as: sound intensity, frequency spectrum and spatial spectrum. The architecture of UAV detection devices on the acoustic field corresponds to the algorithms of reproduction in separate paths of the device of ideology of registration and control of dynamics of change of characteristic of an acoustic field which defines

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34

Onuu, Michael U. "Acoustic Energy Harvesting in Nigeria: Prospects, Technical Problems and Socio-Economic Obstacles." Journal of Energy Research and Reviews, May 27, 2020, 16–33. http://dx.doi.org/10.9734/jenrr/2020/v5i130139.

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Aims: To investigate the prospects or potentials of acoustic energy harvesting in Nigeria as well as highlight technical problems and socio-economic obstacles. Study Design: The study re-examined existing data, noise levels and noise power, from road traffic, aircraft, industrial/occupational, outdoor and indoor noise sources. Noise levels and noise power obtained from recent measurements of such noise sources were also examined and analyzed. The data were compared with values from noise sources used for electricity in other countries of the world. Technical problems and socio-economic o

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Mitu, Ana-Maria, Tudor Sireteanu, Marius Giuclea, and Ovidiu Solomon. "Simulation of Wide-Sense Stationary Random Time-Series With Specified Spectral Densities." Journal of Vibration and Acoustics 138, no. 3 (2016). http://dx.doi.org/10.1115/1.4032899.

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In this paper, an effective approach to the simulation of wide-sense stationary random time-series, defined by its power spectral density (PSD) is presented. This approach is based on approximating the sample paths of target random process by finite series of sample functions of random processes, obtained as the outputs of suitably chosen set of second-order linear filters to independent limited band Gaussian white noise inputs. Thus, the Gaussian distribution of simulated time-series is obtained without applying the central limit theorem. Also, the Fourier spectra of the simulated sample path

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36

Shah, Parthiv N., Håvard Vold, Dan Hensley, Edmane Envia, and David Stephens. "A High-Resolution Continuous-Scan Acoustic Measurement Method for Turbofan Engine Applications." Journal of Turbomachinery 137, no. 12 (2015). http://dx.doi.org/10.1115/1.4031341.

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Detailed mapping of the sound field produced by a modern turbofan engine, with its multitude of overlapping noise sources, often requires a large number of microphones to properly resolve the directivity patterns of the constituent tonal and broadband components. This is especially true at high frequencies where the acoustic wavelength is short, or when shielding, scattering, and reflection of the sound field may be present due to installation effects. This paper presents a novel method for measuring the harmonic and broadband content of complex noncompact noise sources using continuously movi

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