Effect of peak clipping on speech recognition threshold.

Abstract:

:Speech recognition thresholds (SRTs) were measured for a closed set of spondees that had been processed by peak clipping and compression. Both hearing-impaired and normal-hearing subject groups showed progressively higher SRTs with increasing levels of peak clipping, with significant threshold shifts occurring for clipping levels greater than 18 to 24 dB. Neither subject group showed significantly elevated SRTs for the compression processed stimuli. Magnitude-squared coherence analysis of the speech stimuli revealed high levels of distortion generated by peak clipping and relatively low levels generated by the compression processing. Subsequent analysis suggested that the addition of distortion products and not the alteration of the speech waveform envelope was responsible for the observed threshold shifts, and that coherence analysis may be a valuable tool for predicting the effects of distortion on speech intelligibility. Judgments of sound quality showed that the clipping level where SRTs began to be significantly affected coincided with the clipping level at which the quality of the speech was judged to be unacceptable.

journal_name

Ear Hear

journal_title

Ear and hearing

authors

Crain TR,Van Tasell DJ

doi

10.1097/00003446-199412000-00005

subject

Has Abstract

pub_date

1994-12-01 00:00:00

pages

443-53

issue

6

eissn

0196-0202

issn

1538-4667

journal_volume

15

pub_type

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