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Perception of artificial echoes of medium delay

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A simplified criterion of echo perception is formed, based on momentary masking of the echo by the signal, the masking at first being assumed to depend only on momentary relative intensity. The criterion is expressed as a special correlogram of signal and echo levels, which specifies the attenuation required to suppress the echo to the threshold of perceptibility, as a function of echo delay.

Subjective thresholds of discrete echo perception are obtained experimentally using speech, music and bursts of noise for echo delays from 25 ms to 400 ms. A high speed level comparator is used to derive the correlograms of the same combinations of signal and echo.

Agreement between the subjective thresholds and correlograms is good. For signals having peaks which decay very rapidly, there is a systematic divergence of results which is attributed to the difference between the transient response of the subjects' hearing and that chosen for the comparator.
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Document Type: Research Article

Publication date: January 1, 1958

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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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