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Detection of Random Amplitude Modulation

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The main objective of this study was to determine the detection thresholds of random amplitude modulation (RAM) as a function of modulation and carrier frequency (fc). The RAM was obtained by amplitude modulation (AM) of pure-tone carriers by specially generated sample functions (modulators). The experiment concerned the detection thresholds of AM stimuli for random amplitude changes at constant modulation frequency (fm) and simultaneous random changes in amplitude and modulation frequency. The data showed that, the detection thresholds for random amplitude modulation at constant modulation frequency [RAM(fmconst)] tend to be, in a limited range of fm, 8–14 dB lower than those for sinusoidal amplitude modulation (SAM). The detection thresholds for random amplitude and modulation frequency [RAM(fmrandom)] were 3–6 dB lower than the RAM(fmconst) thresholds for high fc and fm. An analysis of the responses of a set of bandpass filters (channels) stimulated by the RAM and SAM signals showed that for the middle and high carrier frequencies, there was a good correspondence between the responses of a set of bandpass filters used and the RAM and SAM detection thresholds.
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Document Type: Research Article

Publication date: November 1, 1998

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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