Packetized Voice White Papers
Perceptual Speech Quality Measure White Paper
Overview PSQM stands for Perceptual Speech Quality Measure. It is an ITU-T P.861 recommended objective method of estimating the subjectiv quality of voice-band speech codecs. The recommendation is based on the work of Beerends et al.The essence of the PSQM algorithm is to measure the distortion experienced by a speech signal when transmitting through various codecs and transmission media. It differs from the signal-to-noise type of measurement in that the distortion is not measured in the normal physical domain (time or frequency domain, for example). Instead, the distortion is measured in an internal psychoacoustic domain’ to mimic the sound perception of human subjects (phone users)in real-life situations so that the measured distortion can b easily correlated with human perceptions. This is done by converting the physical-domain signals into the perceptually meaningful psychoacoustic domain through a series of nonlinear processings such as time-frequency mapping, frequency warping, intensity warping, loudness scaling, asymmetric masking and cognitive modeling etc.
| Publisher | Sage Instruments | File Format | PDF, requires Acrobat Rdr 5 |
|---|---|---|---|
| Date Published | August 1999 | Downloads | 32 |
| Format | White Papers | ||
| Topics | |||
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