Perceptual Speech Quality Measure (PSQM). An ITU-T method for objectively testing voice-band (300 - 3400 Hz) transmission under the varying conditions of transcodings, codec speech input levels, talkers, languages, and bit rates. Defined by Standards P.861 and P.862. VQ (voice quality) needs careful control where bandwidth conserving digital methods are used. Contrast CCI (call clarity index) which works by monitoring ordinary user calls and MOS (mean opinion score), a subjective, statistical method..
PSQM (Perceptual Speech Quality Measure) is a computational and modeling algorithm defined in ITU Recommendation ITU-T P.861 that objectively evaluates and quantifies voice quality of voice-band (300 – 3400 Hz) speech codecs. It may be used to rank the performance of these speech codecs with differing speech input levels, talkers, bit rates and ...Found on http://en.wikipedia.org/wiki/PSQM
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