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Perceptual identification and discrimination of phase distortions

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2 Author(s)
Bloom, P. ; Polytechnic of Central London, London, England ; Preis, D.

Experimental results on the audibility of phase distortion produced by minimum-phase 4kHz and 15 kHz anti-alias filters are reported. Numerous impulse response pairs with identical spectral magnitudes but linear-phase and minimum-phase responses were compared by five test subjects who listened dichotically on earphones. Group-delay distortion was doubled, progressively, until at least 67% mean correct discrimination was attained. At 4kHz, the phase distortion introduced by a cascade of two eighth-order Butterworth filter pairs was audible as was that from only a single pair of seventh-order elliptic filters. At 15kHz, the cascade of up to 4 pairs of seventh-order elliptic filters introduced no perceptible effects. Experimental details and several representative filter frequency and transient responses are included.

Published in:

Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '83.  (Volume:8 )

Date of Conference:

Apr 1983

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