scispace - formally typeset
Search or ask a question
Topic

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
More filters
Journal ArticleDOI
Donglin Su1, Xie Shuguo1, Aixin Chen1, Xiaofan Shang1, Kaixiang Zhu1, Hui Xu1 
TL;DR: In this paper, a theory named "basic emission waveform theory" is presented to solve the problem of identifying electromagnetic emission sources in complex systems, which can be used to simply and accurately identify and analyze the emission sources of complex systems.
Abstract: Variable numerous types of equipment/subsystems may exist in complex systems, which makes it difficult to analyze and identify electromagnetic emission sources. A theory named “basic emission waveform theory” is presented in this paper to solve this problem. This innovation theory characterizes emission with four basic waveforms, including square wave, sine wave, damped oscillation, and spike wave. Then, the effectiveness of the theory is discussed in both theoretical and engineering ways. In particular, the basic waveforms reflect the physical characteristics of the equipment. Furthermore, the basic waveforms generally do not vary with the locations or loading conditions. Therefore, the identification and analysis of an emission source can be realized by analyzing the basic waveforms from the emission of a complex system. Finally, the applications of damped oscillation and square wave in emission source identification field are used as validations of the proposed theory. Moreover, an example of emission source identification for an electric vehicle is also presented. The examples show that the proposed theory can be used to simply and accurately identify and analyze the emission sources of complex systems.

29 citations

Journal ArticleDOI
TL;DR: In this paper, the amplitude demodulation of the difference of two sinewave signals and the common-mode correction of the measurement is performed using a sample-and-hold circuit.
Abstract: A circuit for estimating the amplitude of small signals (in the range of microvolts to a few millivolts) developed initially for an electrical impedance tomography (EIT) data acquisition system is presented. The paper is focused on two points, the accurate demodulation of the difference of two sinewave signals and the common-mode correction of the measurement. The method is oriented for applications in measuring instruments, where a signal source (sinewave oscillator) is assumed to be incorporated. It uses a sample-and-hold circuit, suitably driven, as an amplitude demodulator. One of the advantages of this method is that the realization of the synchronous demodulator (or phase-sensitive detector) does not require a low-pass fitter at the output, resulting in a smaller settling time, that is, in higher speed of measurement. Finally, to improve the accuracy, a self-calibration technique has been developed. >

29 citations

Journal ArticleDOI
01 May 1961
TL;DR: In this paper, the responses of an ideal radio noise meter to continuous sine wave, recurrent impulses, and random noise are evaluated and tabulated, and the ideal meter consists of a narrow-band linear low noise super-heterodyne network followed by a detector which responds to the envelope of the intermediate frequency and a dc voltmeter which indicates the detector output.
Abstract: The responses of an ideal radio noise meter to continuous sine wave, recurrent impulses, and random noise are evaluated and tabulated. The ideal meter consists of a narrow-band linear low noise super-heterodyne network followed by a detector which responds to the envelope of the intermediate frequency and a dc voltmeter which indicates the detector output. Four detector circuits — peak, quasi-peak, average, and rms — are considered. Their “ideal” characteristics are defined in the text.

29 citations

Patent
16 Jan 1996
TL;DR: In this paper, a discharge lamp is operated by amplitude-modulating and pulsing the lamp input power waveform to stabilize the arc with a swept AC periodic wave (such as a sine wave, sawtooth wave, square wave, or a combination thereof).
Abstract: Methods of operating a discharge lamp by amplitude-modulating and pulsing the lamp input power waveform. The techniques control both the arc stabilization and color characteristics of the lamp, respectively. The alternating current (AC) input waveform is amplitude-modulated to stabilize the arc with a swept AC periodic wave (such as a sine wave, sawtooth wave, square wave, etc., or a combination thereof). The swept wave can be generally swept from about 20 kHz to 60 kHz, with a preferable band sweep of from approximately 40 kHz to 50 kHz. The sweep can also be patterned (such as allowing the sweep to have stepped rises and falls within the sweep cycle). The sweep may also contain multiple-frequency sweeps that are bundled together to modulate the carrier wave. These modulation forms are used to center, constrict and stabilize the arc. In addition to this stabilization, the lamp input waveform is pulsed to control and regulate the color characteristics of the lamp.

29 citations

Patent
14 Dec 1981
TL;DR: In this article, an improved multiphase motor energizing drive system was proposed, in which each terminal associated with a different phase is sensed and subtracted from its corresponding controllable sine wave reference command to produce a current error signal for each terminal.
Abstract: Sinusoidal excitation currents are supplied to the three terminals of a "wye" or "delta" connected three phase motor by an improved multiphase motor energizing drive system. For each terminal associated with a different phase, an individual feedback signal representing the current flowing into that respective terminal is sensed and subtracted from its corresponding controllable sine wave reference command to produce a current error signal for each terminal. The error signal for each of these currents is preferably converted to a two-state signal by means of an associated pulse width modulator. The modulator outputs are used to control power semiconductor switches which connect the corresponding motor terminal to either the positive or negative dc voltage. In the preferred system, for one of the terminals, the associated current feedback loop and reference command are omitted, and the associated pulse width modulator is driven by the inverted sum of the error signals from the other two phases. The result is inherently balanced multiphase excitation currents into the motor terminals.

28 citations


Network Information
Related Topics (5)
Voltage
296.3K papers, 1.7M citations
79% related
Signal
674.2K papers, 4.5M citations
78% related
Artificial neural network
207K papers, 4.5M citations
77% related
Control theory
299.6K papers, 3.1M citations
77% related
Robustness (computer science)
94.7K papers, 1.6M citations
77% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202378
2022157
2021138
2020253
2019344
2018336