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.
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Patent•
19 Jan 1989
TL;DR: In this paper, a method or combination of a DC voltage supply, a converter including a series or a parallel resonant circuit (LR, CR, TR), and a load (T1, T2) including at least one fluorescent lamp responsive to the sinusoidal current to effect excitation of the lamp is presented.
Abstract: In a method or combination, a DC voltage supply, a converter including a series or a parallel resonant circuit (LR, CR, TR) for converting the DC voltage to a sinusoidal current, and a load (T1, T2) including at least one fluorescent lamp responsive to the sinusoidal current to effect excitation of the lamp.
61 citations
TL;DR: In this article, a mixed-signal reflectometry (MSR) method was proposed for frequency domain reflectometry, which is less expensive and smaller than the PDFDR and has very similar performance.
Abstract: Location of faults on aging cables is of great interest to maintainers of aircraft, cars, power distribution systems, communication systems, etc. One class of methods for locating faults is frequency domain reflectometry (FDR), using sine waves as the forcing function. A new frequency domain method called mixed-signal reflectometry (MSR) is described in this paper and compared to data from phase detection FDR (PDFDR) methods. The MSR is less expensive and smaller than the PDFDR and has very similar performance. A prototype system using the 100-200-MHz bandwidth with 256 40-kHz steps is shown to have a resolution of about 10 cm, very similar to a PDFDR in the same frequency band.
60 citations
03 Apr 1990
TL;DR: The results, although preliminary, provide evidence that harmonic zero-phase sine-wave analysis/synthesis, combined with effective estimation of sin-wave amplitudes and probability of voicing, offers a promising approach to noise reduction.
Abstract: Noise reduction is performed in the context of a high-quality harmonic zero-phase sine-wave analysis/synthesis system which is characterized by sine-wave amplitudes, a voicing probability, and a fundamental frequency. Least-squared error estimation of a harmonic sine-wave representation leads to a soft decision template estimate consisting of sine-wave amplitudes and a voicing probability. The least-squares solution is modified to use template-matching with nearest neighbors. The reconstruction is improved by using the modified least-squares solution only in spectral regions with low signal-to-noise ratio. The results, although preliminary, provide evidence that harmonic zero-phase sine-wave analysis/synthesis, combined with effective estimation of sine-wave amplitudes and probability of voicing, offers a promising approach to noise reduction. >
60 citations
TL;DR: In this paper, the use of an exponentially weighted nonlinear time series model to fit the tourist arrival data is employed, which comprises a linear term in time and a sine function in time.
Abstract: This article studies the use of an exponentially weighted nonlinear time series model to fit the tourist arrival data. A model which comprises a linear term in time and a sine function in time is employed. Because of the seasonal fluctuation in the data, deseasonalized data are used in fitting the model. The approach suggested is applied to the tourist arrival data in Singapore and the fitted model is then used to forecast the tourist arrivals. The proposed model is compared with the naive I model, the naive II model, a simple linear regression time series model, and an ARIMA model. Comparison of the mean absolute percentage errors shows that the proposed model is the best among all these models.
60 citations
TL;DR: Results of the experiments showed that sine wave stimulation produced significantly greater muscle strength and significantly less pain than square wave, Russian or interferential stimulation at that same current.
Abstract: Electrical stimulation is a commonly used modality for both athletic training and physical therapy. However, there are limited objective data available to determine the waveform which provides the maximum muscle strength as well as minimizing pain. In the present investigation, two groups of subjects were examined. Group 1 was composed of six males and four females and group 2 was composed of three male and three female subjects. The first series of experiments investigated muscle strength with stimulation at currents of 20, 40 and 60 milliamps using sine, square, Russian and interferential waveforms evaluating strength production and pain as outcomes. The second phase of experiments compared the effect of the different waveforms on current dispersion in surface versus deep muscle electrodes with these same waveforms. The results of the experiments showed that sine wave stimulation produced significantly greater muscle strength and significantly less pain than square wave, Russian or interferential stimulation at that same current. The most painful stimulation was square wave. Strength production was greatest with sine wave and least with Russian and interferential. An explanation of these findings may be the filtering effect of the fat layer separating skin from muscle. The highly conductive muscle and skin dermal layers would form the plates of a capacitor separated by the subcutaneous fat layer providing an RC filter. This filtering effect, while allowing sine wave stimulation to pass to the muscle, reduced power transfer in square wave, Russian and interferential stimulation is observed.
60 citations