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Sine wave

About: Sine wave is a research topic. Over the lifetime, 12183 publications have been published within this topic receiving 93013 citations. The topic is also known as: sinusoid.


Papers
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Journal ArticleDOI
TL;DR: Data are presented which support the concept that much of the distortion of a pressure wave in its transmission down an artery can be explained in terms of a resonant frequency and damping coefficient, and that these variables in turn arc dependent upon physical properties of the segment of artery transmitting the wave.
Abstract: The large arteries may be expected to respond to a central pulse wave as a resonant system and the pressure pulse can be resolved into a series of pure sinusoidal waves. Therefore, a frequency filter network was designed which could duplicate the resonant frequency and damping coefficient of a segment of artery by proper adjustment of the circuit constants. Data are presented which support the concept that much of the distortion of a pressure wave in its transmission down an artery can be explained in terms of a resonant frequency and damping coefficient, and that these variables in turn arc dependent upon physical properties of the segment of artery transmitting the wave.

31 citations

Patent
23 Dec 1986
TL;DR: In this paper, a method and apparatus for performing a complete functional test of a power system stabilizer connected to the excitation system of an electrical power generator is disclosed, and two tests are performed, one an on-line modulation test, and the second a system response test.
Abstract: A method and apparatus for performing a complete functional test of a power system stabilizer connected to the excitation system of an electrical power generator is disclosed. Two tests are performed, one an on-line modulation test, and the second a system response test. In the on-line modulation test, an internal 0.5 hertz sine wave is generated by a microprocessor which is applied as a frequency modulating input to the continuous wave frequency transducer included in the power system stabilizer. Such a signal acts to stimulate intertie mode oscillations and provide a means of determining the gain and phase shift characteristic of the power system stabilizer. In the second test, a voltage step type of signal is generated and applied to the output of the power system stabilizer where it is then coupled to the excitation system of the generator. This has the effect of stimulating local mode oscillations. The generator response to the local mode oscillation is sensed to determine system damping. Both tests are adapted to verify the operational status of the power system stabilizer and the adequacy of its adjustments. Furthermore, a local terminal and a telephone modem are connected to a communication port associated with the microprocessor for enabling the test to be initiated and the results evaluated either locally or remotely.

31 citations

Journal ArticleDOI
TL;DR: It is shown that the state of a strictly output passive system with an L 2 input converges to zero, and an LTI controller, constructed based on the internal model principle, the state trajectories of the plant (and hence also the error signal) converge to zero.
Abstract: We show that the state of a strictly output passive system with an L 2 input converges to zero. The result is applied to the disturbance rejection problem (with reference signal zero), where the disturbance can be decomposed into a finite superposition of sine waves of arbitrary but known frequencies and an L 2 signal. Using an LTI controller, constructed based on the internal model principle, the state trajectories of the plant (and hence also the error signal) converge to zero.

31 citations

Patent
19 Jul 1982
TL;DR: A phase controlled signal generator using a cyclical counter with preset and reset control terminals to provide a continually advancing digital signal is described in this paper, where the signal is converted in a sine table PROM and D to A converter to the sine wave signal which signal has a phase shift with respect to a reference in accordance with a phase control preset input.
Abstract: A phase controlled signal generator using a cyclical counter with preset and reset control terminals to provide a continually advancing digital signal. This digital signal is converted in a sine table PROM and D to A converter to a sine wave signal which signal has a phase shift with respect to a reference in accordance with a phase control preset input and which signal can be periodically synchronized to a given starting phase to maintain signal stability or Doppler frequency shift.

31 citations

Proceedings ArticleDOI
27 May 1998
TL;DR: A plot of reported spurious performance on DDSs is presented revealing a performance barrier that designers are striving to break, and recent advances in architectural techniques are described that are designed to optimize spectral performance while minimizing architectural complexity.
Abstract: This paper presents a survey of the latest techniques and hardware advances in sine output direct digital synthesizers (DDSs). First, a brief description of the theory of sine output DDSs is presented. A sine output DDS has the advantage of being able to synthesize high spectral purity sine wave signals over a wide range of frequencies utilizing compact digital integrated circuits containing an accumulator, a sine look-up table, and a digital-to-analog converter (DAC). (The DDS is completed with an output filter.) The DDS can produce an output frequency from zero to a maximum frequency that is on the order of 1/3 of the clock frequency of the digital components. The principal advances in DDSs have been in increasing the maximum frequency (clock speed) and in increasing the spectral purity (spur reduction). Second, sine output DDS designs are examined that fall into two broad categories: designs for high speed and spectrally clean performance and designs for applications that require special features. Results are presented showing how the spectral purity of the DDS is related to the complexity and performance parameters of the digital components. Recent advances in architectural techniques are described that are designed to optimize spectral performance while minimizing architectural complexity. Finally, a survey of the latest DDSs and components developed by several manufacturers are described presenting key performance parameters such as clock speed, spectral purity, frequency resolution, DC power consumption, and special features. A plot of reported spurious performance on DDSs (or DACs for DDSs) is presented revealing a performance barrier that designers are striving to break. The advances necessary to break this barrier will be discussed.

31 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202378
2022157
2021138
2020253
2019344
2018336