The Effects of Digital Quantization Error on Speech Intelligibility and Perceived Speech Quality in Normal Hearing and Hearing-Impaired Subjects.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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The effects of digital quantization error upon speech intelligibility and perceived speech quality, for 20 normal hearing subjects and 20 hearing-impaired subjects, were investigated for digitized speech that had been processed to simulate 14, 12, 10 and 8-bit integer conversion and 6, 5, 4 and 3-bit floating-point conversion. For the integer and floating-point data, there were no significant differences in speech intelligibility for any conversion condition in either group. The results of the perceived speech quality experiment revealed differences in the conversion rates for the normal hearing group. Speech processed using 14 and 12-bit integer conversion was judged to be superior to speech processed using 10 and 8-bit integer conversion. Speech processed using 6-bit floating-point conversion was judged to be superior to speech processed using, 5, 4 or 3-bit floating-point conversion.