Modulation thresholds and critical modulation frequency based on random amplitude and frequency changes.
نویسندگان
چکیده
منابع مشابه
Amplitude and Frequency/Phase Modulation
I always had difficulties in understanding frequency modulation (FM) and its frequency spectrum. Even for the pure tone modulation, the FM spectrum consists of an infinite number of sidebands whose signs change from one sideband to the next one and whose amplitudes are given by the horrible Bessel functions. . . I work for Zurich Instruments, a Swiss maker of lock-in amplifiers and it has becom...
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B. Ganapathisubramani, N. Hutchins, J. P. Monty, D. Chung and I. Marusic Journal of Fluid Mechanics / Volume 712 / December 2012, pp 61 91 DOI: 10.1017/jfm.2012.398, Published online: 27 September 2012 Link to this article: http://journals.cambridge.org/abstract_S0022112012003989 How to cite this article: B. Ganapathisubramani, N. Hutchins, J. P. Monty, D. Chung and I. Marusic (2012). Amplitu...
متن کاملDetection of combined frequency and amplitude modulation.
This article is concerned with the detection of mixed modulation (MM), i.e., simultaneously occurring amplitude modulation (AM) and frequency modulation (FM). In experiment 1, an adaptive two-alternative forced-choice task was used to determine thresholds for detecting AM alone. Then, thresholds for detecting FM were determined for stimuli which had a fixed amount of AM in the signal interval o...
متن کاملEffects of carrier frequency, modulation rate, and modulation waveform on the detection of modulation and the discrimination of modulation type (amplitude modulation versus frequency modulation).
Initially, psychometric functions were measured for the detection of amplitude modulation (AM) or frequency modulation (FM), using a two-alternative forced-choice (2AFC) task. Carrier frequencies were 125, 1000, and 6000 Hz, and modulation rates were 2, 5, and 10 Hz. For the two lower carrier frequencies, FM detection tended to be best at the lowest modulation rate while AM detection was best a...
متن کاملOn the amplitude- and frequency-modulation decomposition of signalsa)
In general, the problem of determining the amplitude and frequency modulations ~AM and FM! of a signal is ill posed because there is an unlimited number of combinations of AM and FM that will generate a given signal. Although Gabor proposed a method for uniquely defining the AM and FM of a signal, namely via the analytic signal, the results obtained are sometimes physically paradoxical. In this...
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ژورنال
عنوان ژورنال: Journal of the Acoustical Society of Japan (E)
سال: 1994
ISSN: 0388-2861,2185-3509
DOI: 10.1250/ast.15.67