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Journal articles on the topic 'Direct Digital Synthesis'

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Published: 4 June 2021
Last updated: 7 September 2023

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1

Calbaza, D. E., and Y. Savaria. "A direct digital period synthesis circuit." IEEE Journal of Solid-State Circuits 37, no. 8 (August 2002): 1039–45. http://dx.doi.org/10.1109/jssc.2002.800923.

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2

Machacek, Zdenek, Martin Gabzdyl, and Viktor Michna. "Direct digital synthesis based - function generator with digital signal modulations." IFAC Proceedings Volumes 43, no. 24 (2010): 189–94. http://dx.doi.org/10.3182/20101006-2-pl-4019.00036.

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3

Manivannan, K., and C. Eswaran. "Direct synthesis approach for GIC digital filters." Electronics Letters 24, no. 10 (May 12, 1988): 624–26. http://dx.doi.org/10.1049/el:19880423.

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4

McEwan, Alistair, and Steve Collins. "Direct Digital-Frequency Synthesis by Analog Interpolation." IEEE Transactions on Circuits and Systems II: Express Briefs 53, no. 11 (November 2006): 1294–98. http://dx.doi.org/10.1109/tcsii.2006.882349.

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5

Tao Wang. "Signal Generator Based on Direct Digital Synthesis Techniques." International Journal of Digital Content Technology and its Applications 5, no. 8 (August 31, 2011): 24–30. http://dx.doi.org/10.4156/jdcta.vol5.issue8.4.

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6

Sneka, C., D. Anusha, P. Sivasankari, K. Sivasankari, and C. Thiruvengadam. "Realization of Direct Digital Synthesis in Cordic Algorithm." International Journal of Advanced Scientific Research and Development (IJASRD) 6, no. 4 (May 10, 2019): 01. http://dx.doi.org/10.26836/ijasrd/2019/v6/i4/60401.

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7

Seldowitz, Michael A., Jan P. Allebach, and Donald W. Sweeney. "Synthesis of digital holograms by direct binary search." Applied Optics 26, no. 14 (July 15, 1987): 2788. http://dx.doi.org/10.1364/ao.26.002788.

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8

Chren, W. A. "RNS-based enhancements for direct digital frequency synthesis." IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing 42, no. 8 (1995): 516–24. http://dx.doi.org/10.1109/82.404073.

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9

Calbaza, D. E., and Y. Savaria. "Direct digital frequency synthesis of low-jitter clocks." IEEE Journal of Solid-State Circuits 36, no. 3 (March 2001): 570–72. http://dx.doi.org/10.1109/4.910498.

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10

Li, Zhi-Yuan, Hai-Feng Yu, Xin-Sheng Tan, Shi-Ping Zhao, and Yang Yu. "Manipulation of superconducting qubit with direct digital synthesis." Chinese Physics B 28, no. 9 (September 2019): 098505. http://dx.doi.org/10.1088/1674-1056/ab37f9.

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11

Zavrel, Robert J. "HDTV and NTSC Transmission Using Direct Digital Synthesis." SMPTE Journal 100, no. 12 (December 1991): 961–62. http://dx.doi.org/10.5594/j02380.

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12

Dayu Yang, F. F. Dai, Weining Ni, Shi Yin, and R. C. Jaeger. "Delta-Sigma Modulation for Direct Digital Frequency Synthesis." IEEE Transactions on Very Large Scale Integration (VLSI) Systems 17, no. 6 (June 2009): 793–802. http://dx.doi.org/10.1109/tvlsi.2008.2008458.

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13

Romashov, Vladimir V., Kirill A. Yakimenko, Andrey N. Doktorov, and Lubov V. Romashova. "Low-noise hybrid frequency synthesizers based on direct digital and direct analog synthesis." Izmeritel`naya Tekhnika, no. 4 (April 2020): 51–56. http://dx.doi.org/10.32446/0368-1025it.2020-4-51-56.

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The research of the possibility of using hybrid frequency synthesizers based on direct digital and direct analog methods of frequency synthesis as heterodynes of modern spectrum analyzers constructed according to the superheterodyne scheme is presented. The main advantages of such synthesizers over traditionally used heterodyne schemes based on direct digital and indirect frequency synthesis methods are shown. The requirements for the heterodynes of the first mixing stages of spectrum analyzers are presented. A block diagram of a wideband heterodyne generating a frequency range from 4000 MHz to 8000 MHz with a step not exceeding 1 Hz is proposed. Formulas for calculating the main frequency ratios in the structure of the heterodyne have been developed. A mathematical model of phase noise power spectral density (PSD) depending on the offset frequency from the carrier is developed. The noise characteristics of the proposed scheme are studied using the model. It is determined that at the output frequency of the heterodyne equal to 4521,4 MHz, the level of phase noise PSD is: minus 90 dBc/Hz at the offset frequency equal to 100 Hz; minus 140 dBc/Hz at the offset frequency equal to 100 kHz. It is shown that the hybrid synthesizer based on direct digital and direct analog synthesis methods has an advantage in the level of phase noise from 5 to 30 dB over the low-noise heterodynes of modern spectrum analyzers at frequencies above 1 kHz from the carrier. Additional advantages of the proposed scheme are a simple architecture, low power consumption and high frequency tuning speed due to the absence of phaselocked loops in the structure of the heterodyne.
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14

., Prajakta J. Katkar. "DIRECT DIGITAL SYNTHESIS BASED CORDIC ALGORITHM: A NOVEL APPROACH TOWARDS DIGITAL MODULATIONS." International Journal of Research in Engineering and Technology 04, no. 07 (July 25, 2015): 48–53. http://dx.doi.org/10.15623/ijret.2015.0407008.

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15

Lekic, Predrag, and Aca Micic. "Direct synthesis of the digital FIR full-band differentiators." Facta universitatis - series: Electronics and Energetics 15, no. 3 (2002): 465–79. http://dx.doi.org/10.2298/fuee0203465l.

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In this paper, two methods for designing digital full-band FIR differentiators are presented. First of them, named Immediate, represents the efficient and general method for brusque designing the first and higher degree digital full-band FIR differentiators of even and odd order, with simultaneous approximation of the prescribed magnitude and group delay responses, using originally modified eigenfilter method. The proposed method presents an approach for the FIR differentiator frequency response approximation directly in the complex, and not in the real domain. The second method, named Intermediary, represents the efficient approach for oblique designing only the second and higher degree digital full-band FIR differentiators of odd order. The comparison of the characteristics and results of these two presented methods is performed. In order to illustrate the presented methods effectiveness, the numerical design examples of the first second degree full-band digital differentiators are given, too.
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16

Venkateswarlu, T. "Direct canonic synthesis of all-pass digital filter structures." IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications 46, no. 12 (1999): 1495–97. http://dx.doi.org/10.1109/81.809553.

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17

Mohan, P. V. A. "On RNS-based enhancements for direct digital frequency synthesis." IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing 48, no. 10 (2001): 988–90. http://dx.doi.org/10.1109/82.974788.

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18

Zou, Luyao, Roman A. Motiyenko, Laurent Margulès, and Eugen A. Alekseev. "Millimeter-wave emission spectrometer based on direct digital synthesis." Review of Scientific Instruments 91, no. 6 (June 1, 2020): 063104. http://dx.doi.org/10.1063/5.0004461.

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19

Bellaouar, A., M. S. O'brecht, A. M. Fahim, and M. I. Elmasry. "Low-power direct digital frequency synthesis for wireless communications." IEEE Journal of Solid-State Circuits 35, no. 3 (March 2000): 385–90. http://dx.doi.org/10.1109/4.826821.

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20

Sternhagen, J. D., K. Mitzner, E. Berkenpas, M. Karlgaard, C. E. Wold, and D. W. Galipeau. "A direct digital synthesis system for acoustic wave sensors." IEEE Sensors Journal 2, no. 4 (August 2002): 288–93. http://dx.doi.org/10.1109/jsen.2002.803744.

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21

van Rooyen, G. J., and J. G. Lourens. "A quadrature baseband approach to direct digital FM synthesis." IEEE Transactions on Broadcasting 46, no. 3 (2000): 227–30. http://dx.doi.org/10.1109/11.892160.

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22

Koukourlis, C. S., P. H. Houlis, and J. N. Sahalos. "A general purpose differential digital modulator implementation incorporating a direct digital synthesis method." IEEE Transactions on Broadcasting 39, no. 4 (1993): 383–89. http://dx.doi.org/10.1109/11.259598.

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23

Romashov, V. V., K. A. Yakimenko, A. N. Doktorov, and L. V. Romashova. "Low-Noise Hybrid Frequency Synthesizers Based on Direct Digital and Direct Analog Synthesis." Measurement Techniques 63, no. 4 (July 2020): 308–13. http://dx.doi.org/10.1007/s11018-020-01788-y.

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24

Samad, S. A. "DIRECT SYNTHESIS OF LADDER WAVE DIGITAL FILTERS WITH TUNABLE PARAMETERS." ASEAN Journal on Science and Technology for Development 20, no. 1 (December 21, 2017): 1–18. http://dx.doi.org/10.29037/ajstd.364.

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This paper proposes a method for the synthesis of ladder wave digital filters (WDFs) directly from the digital domain. This method avoids the need for the synthesis of analog reference filters conventionally required in WDF design. This direct method allows for the determination of the WDF coefficients from the digital domain transfer function. This is similar to conventional infinite impulse response (IIR) filter coefficient determination but the WDF will give a more efficient realization. Due to the WDFs power complementary properties, a first-order ladder WDF can simultaneously realize both lowpass and highpass responses using the same structure, while a second-order WDF can realize both the bandpass and bandstop responses simultaneously. By appropriately choosing the WDF adaptor configuration and structure, tunable parameters can be determined from the digital domain transfer function that controls the 3dB cut-off frequency of the lowpass and highpass filters, and the centre frequency and 3-dB bandwidth of the bandpass and bandstop filters. This results in the WDFs requiring a minimum number of multipliers for realization.
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25

Daishido, Tsuneaki, Kuniyuki Asuma, Kazuhiko Nishibori, Junichi Nakajima, Motoko Yano, Eiichiro Otobe, Naoki Watanabe, Akira Tsuchiya, and Seiichiro Iwase. "Direct Imaging Digital Lens for Transient Radio Source Survey." International Astronomical Union Colloquium 131 (1991): 86–89. http://dx.doi.org/10.1017/s0252921100013105.

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AbstractFFT based 2D Dygital Lens is discussed comparing with Fourier synthesis. The sensitivity of constructing Large Array will be 50mJy. Precise manipuration of the radiation field is possible in it.
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26

Pazoev, A. L. "Main limitations in the synthesis of digital holograms of 3D images." Interexpo GEO-Siberia 8, no. 1 (May 18, 2022): 117–25. http://dx.doi.org/10.33764/2618-981x-2022-8-1-117-125.

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Problems of digital synthesis of holograms of 3D objects are discussed. The problem of using fast Fourier transform (FFT) in the synthesis of a remote object is numerically shown. A method for implementing a direct numerical Fresnel transformation based on the use of spatial symmetries of the Fresnel transformation kernel as the main element of calculations is offered. Its promising possibilities are discussed. An example of calculating a hologram of a 3D image and its restoration is given. At the moment, a program for the synthesis of holograms by direct integral transformation without the use of FFT has been developed, with the help of which the time for the synthesis of holograms is reduced more than four times. The prospects of this method are shown, which make it possible to reduce the time of direct synthesis of holograms of 3D objects by an order of magnitude or more.
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27

Li, Dawei, Daiting Shi, Ermeng Hu, Yigen Wang, Lu Tian, Jianye Zhao, and Zhong Wang. "A frequency standard via spectrum analysis and direct digital synthesis." Applied Physics Express 7, no. 11 (October 29, 2014): 112203. http://dx.doi.org/10.7567/apex.7.112203.

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28

Zhihe Zhou and G. S. La Rue. "A 12-Bit Nonlinear DAC for Direct Digital Frequency Synthesis." IEEE Transactions on Circuits and Systems I: Regular Papers 55, no. 9 (October 2008): 2459–68. http://dx.doi.org/10.1109/tcsi.2008.920981.

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29

Chang Yong Kang and E. E. Swartzlander. "Digit-pipelined direct digital frequency synthesis based on differential CORDIC." IEEE Transactions on Circuits and Systems I: Regular Papers 53, no. 5 (May 2006): 1035–44. http://dx.doi.org/10.1109/tcsi.2005.862183.

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30

HULA, I. V., L. V. KARPOVA, V. M. MELNYCHUK, and O. I. POLIKAROVSKYKH. "METHOD OF REDUCING PERIODIC COMPONENT NOISES DIGITAL SYNTHESIZERS DIRECT SYNTHESIS." HERALD of Khmelnytskyi national university 271, no. 2 (March 2019): 150–59. http://dx.doi.org/10.31891/2307-5732-2019-271-2-150-159.

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31

Finneran, Ian A., Daniel B. Holland, P. Brandon Carroll, and Geoffrey A. Blake. "A direct digital synthesis chirped pulse Fourier transform microwave spectrometer." Review of Scientific Instruments 84, no. 8 (August 2013): 083104. http://dx.doi.org/10.1063/1.4818137.

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32

Rybin, Yu K., and T. A. Petlina. "Basic metrological properties of electronic oscillators with direct digital synthesis." Measurement 98 (February 2017): 243–49. http://dx.doi.org/10.1016/j.measurement.2016.12.009.

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33

Nieznanski, J. "An alternative approach to the ROM-less direct digital synthesis." IEEE Journal of Solid-State Circuits 33, no. 1 (1998): 169–70. http://dx.doi.org/10.1109/4.654951.

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34

Polikarovskykh, O. I. "DIRECT DIGITAL SYNTHESIZER IN A NEW MATHEMATICAL BASIS." Proceedings of the O.S. Popov ОNAT 1, no. 2 (December 31, 2020): 100–110. http://dx.doi.org/10.33243/2518-7139-2020-1-2-100-110.

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The principles of the construction and operation of a digital synthesizer for direct frequency synthesis with acceleration of computational operations by using a residual class system (RNS) are considered. The specifics of the implementation of the operation of direct and inverse transformations from the positional number system to the number system of the residual classes are described. A mathematical model of a synthesizer with a phase accumulator in the system of residual classes is considered. The ways of designing a digital synthesizer of direct synthesis with a phase accumulator in the RNS system and a sinusoidal DAC are considered. In traditional schemes, the conversion of residuals to the value of an analog signal occurs in several stages, where conversion to a binary system is one of the stages. This procedure degrades the speed of the RNS system, adding additional constraints and increasing the waiting time for the conversion result. Methods of converting from RNS to binary number system for basic operations are considered. A DDS design with a phase accumulator in the residual class system and a converter to an analog signal form without using a slow ROM is proposed. The problems of efficient use of the synthesizer crystal area and reduction of delays in the formation of the output signal are considered. A study of one of the main functional blocks of a direct digital frequency synthesizer, a digital-to-analog converter, has been carried out. The architecture of a direct digital frequency synthesizer with a DAC direct conversion from a non-positional number system to an analog signal is proposed. The main sources of noise generation in digital computational synthesizers of the proposed type are investigated. A mathematical model is proposed for calculating the power spectral density of phase noise, which will allow analyzing the noise characteristics in synthesizers built on the indicated principles.
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35

Verteshev, Sergei, and Vladimir Konevtsov. "DIRECT DIGITAL CONTROL IN A COMPLEX OF SOFTWARE DESIGN OF DIGITAL CONTROL SYSTEMS." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 3 (June 15, 2017): 332. http://dx.doi.org/10.17770/etr2017vol3.2534.

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This article provides the functionality of creating direct digital control devices in the computer-aided design of digital automatic control systems (CAD of digital ACS), in a complex of software design of digital control systems (SDSDC complex) for automated process control systems. Technical tools are defined by the international standard IEC 61131-1: 2003 (Part 1: General data). The possibility of implementing SDSDC complex in direct digital control, single-cycle and multi-cycle ladder diagrams, identification of objects of management and synthesis of digital controllers in comparison with the international standard IEC 61131-3: 2003 (Part 3: Programming Languages) are evaluated. Users’ productivity is estimated as well as the possibility of its separation between the users at different stages of the design of digital systems of automatic control is assessed.
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36

Verteshev, Sergei, and Vladimir Konevtsov. "DIRECT DIGITAL CONTROL IN A COMPLEX OF SOFTWARE DESIGN OF DIGITAL CONTROL SYSTEMS." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 3 (June 15, 2017): 337. http://dx.doi.org/10.17770/etr2017vol3.2536.

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This article provides the functionality of creating direct digital control devices in the computer-aided design of digital automatic control systems (CAD of digital ACS), in a complex of software design of digital control systems (SDSDC complex) for automated process control systems. Technical tools are defined by the international standard IEC 61131-1: 2003 (Part 1: General data). The possibility of implementing SDSDC complex in direct digital control, single-cycle and multi-cycle ladder diagrams, identification of objects of management and synthesis of digital controllers in comparison with the international standard IEC 61131-3: 2003 (Part 3: Programming Languages) are evaluated. Users’ productivity is estimated as well as the possibility of its separation between the users at different stages of the design of digital systems of automatic control is assessed.
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37

Lee, Sung-Won, and In-Cheol Park. "Quadrature direct digital frequency synthesis using fine-grain angle rotation technique." Electronics Letters 39, no. 17 (2003): 1235. http://dx.doi.org/10.1049/el:20030795.

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38

Engel, Gil, Daniel Fague, and Assaf Toledano. "RF digital-to-analog converters enable direct synthesis of communications signals." IEEE Communications Magazine 50, no. 10 (October 2012): 108–16. http://dx.doi.org/10.1109/mcom.2012.6316784.

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39

Jensen, H. T., and I. Galton. "A low-complexity dynamic element matching DAC for direct digital synthesis." IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing 45, no. 1 (1998): 13–27. http://dx.doi.org/10.1109/82.659453.

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40

Langlois, J. M. P., and D. Al-Khalili. "Phase to sinusoid amplitude conversion techniques for direct digital frequency synthesis." IEE Proceedings - Circuits, Devices and Systems 151, no. 6 (2004): 519. http://dx.doi.org/10.1049/ip-cds:20040500.

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41

Ekroot, C. G., and S. I. Long. "A GaAs 4-bit adder-accumulator circuit for direct digital synthesis." IEEE Journal of Solid-State Circuits 23, no. 2 (April 1988): 573–80. http://dx.doi.org/10.1109/4.1024.

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42

Nie, Jing, Xiaofeng Meng, and Ning Li. "Quartz crystal sensor using direct digital synthesis for dew point measurement." Measurement 117 (March 2018): 73–79. http://dx.doi.org/10.1016/j.measurement.2017.12.008.

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43

De Carli, A., and A. Kozlovic. "A New Approach to the Direct Synthesis of a Digital Controller." IFAC Proceedings Volumes 22, no. 18 (November 1989): 171–76. http://dx.doi.org/10.1016/s1474-6670(17)52839-6.

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44

Suchenek, M., and T. Starecki. "Programmable pulse generator based on programmable logic and direct digital synthesis." Review of Scientific Instruments 83, no. 12 (December 2012): 124704. http://dx.doi.org/10.1063/1.4771921.

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45

Cordesses, L. "Direct digital synthesis: a tool for periodic wave generation (part 1)." IEEE Signal Processing Magazine 21, no. 4 (July 2004): 50–54. http://dx.doi.org/10.1109/msp.2004.1311140.

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46

Gula, I. V., O. I. Polikarovskykh, K. I. Horiashchenko, I. V. Karpova, and V. M. Melnychuk. "Measurements of Periodic Signals Phase Shifts with Application of Direct Digital Synthesis." Devices and Methods of Measurements 10, no. 2 (June 24, 2019): 169–77. http://dx.doi.org/10.21122/2220-9506-2019-10-2-169-177.

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The development of new methods and high-bit instruments for measuring phase shifts of high-frequency periodic signals with high speed for radar and radionavigation tasks is an actual task. The purpose of this work is to create a new phase shift meter for high-frequency periodic signals based on the double-matching method using direct digital frequency synthesis.On the basis of the proposed mathematical model of phase shift measurements of periodic signals by the method of double coincidence using the statistical accumulation of pulse coincidences, a functional diagram of a digital phase shift meter of periodic signals using a direct digital frequency synthesizer is developed. This allowed the implementation of an 8-bit converter phase shift signal to the code on the programmed logic integrated circuit EPM240T100C5N firm Altera.The digital phase shift meter of periodic signals based on the double-matching method consists of two comparators, two short-wave pulse generators, a direct digital frequency synthesizer, two pulse counter control circuits, two short pulse coincidence circuits, two pulse counting circuits, four clock counters, four registers, a microcontroller and an indicator. Block diagram of a double-matching digital phase meter using direct digital sintesizer use minimal hardware logic.In the developed phase shift meter, due to the use of the double-matching method, the time delay between signals does not depend on the period of input signals and can be found when changing the frequency of periodic pulses in wide limits. Measurement errors will be determined mainly by the duration of the pulses of coincidence. The use of statistical accumulation of pulse coincidence in the basis of the work allowed eliminating the restrictions on the duration of pulses of known non-ionic meters.On the basis of the obtained results, a high-bit converter of phase shifts of high-frequency periodic signals into a binary code with high speed for problems of industrial tomography, radar and radionavigation can be developed.
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47

Kushwaha, Monika, and U. M. Gokhale. "Design and Simulation of Direct Digital Synthesizer for Wireless Applications." Journal of Advance Research in Electrical & Electronics Engineering (ISSN: 2208-2395) 2, no. 3 (March 31, 2015): 15–20. http://dx.doi.org/10.53555/nneee.v2i3.213.

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Direct Digital Synthesis is an improved method of producing analog waveforms where the generation is done completely in the digital sphere. In this paper, a design is presented for a Direct Digital Synthesizer (DDS) which generates multiple waveforms. The architecture is based on a 32 bit phase accumulator and a look-up table (LUT) as phase to amplitude converter. This design will be simulated in Xilinx. This DDS will offer qualities like fast switching, good frequency resolution and good stability. This DDS can become highly portable if it is designed on a Field Programmable Gate Array (FPGA).
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48

Romashov, V. V., A. N. Doktorov, K. A. Yakimenko, and N. A. Sochneva. "Application high-speed digital-to-analog converters for direct digital synthesis of high-frequency radio signals." Journal of Physics: Conference Series 1632 (September 2020): 012023. http://dx.doi.org/10.1088/1742-6596/1632/1/012023.

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49

Adad, Walter Fabian, and Ricardo Javier Iuzzolino. "Low distortion signal generator based on Direct Digital Synthesis for ADC Characterization." ACTA IMEKO 1, no. 1 (July 10, 2012): 59. http://dx.doi.org/10.21014/acta_imeko.v1i1.23.

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<p class="Abstract"><span lang="EN-US">This paper presents a low distortion signal generator with a frequency range from 0 to 10 kHz using the direct digital synthesis (DDS) method for ADC characterization. The results show that the maximum distortion in the whole frequency range is -80.37 dB, the frequency resolution is 1.421 nHz (with a 48-bits DDS chip), the stability in frequency is 25 µHz/Hz and the amplitude stability is 13 µV/V.</span></p>
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50

Aboltins, Arturs, Dmitrijs Pikulins, Juris Grizans, and Sergejs Tjukovs. "Piscivorous Bird Deterrent Device Based on a Direct Digital Synthesis of Acoustic Signals." Elektronika ir Elektrotechnika 27, no. 6 (December 14, 2021): 42–48. http://dx.doi.org/10.5755/j02.eie.28977.

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This paper addresses the development of an acoustic deterrent device for the protection of fishponds and other objects against the unwanted presence of birds. The objective of the paper is not only providing of a deep analysis of available technologies for waveform synthesis and generation, but also building a theoretical base for the design and implementation of acoustic bird deterrent solutions. The paper addresses the synthesis of bird songs and calls using technologies for music, speech, and other types of acoustic signal processing. The second part of the paper is devoted to the unique algorithms and implementation details of the intelligent acoustic deterrence device prototype. The practical applicability of algorithms for bird call record conversion into synthesizer sequences has been analysed and possible issues are highlighted. The effectiveness and ease of practical implementation of the given method in the hardware are briefly discussed.
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