Evaluation of a segmental SNR measure as an indicator of the quality of ADPCM coded speech

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Abstract
Two objective measures of speech quality, the traditional signal to quantization noise ratio (SNR) and a segmental SNR, are compared from the point of view of their ability to predict subjective preference ratings of PCM and ADPCM coded speech. The SNR shows an 8‐dB bias for PCM coding, i.e., the SNR of the PCM has to exceed the SNR of ADPCM by 8 dB before the two are judged to be equally preferable. In contrast, the segmental SNR shows no such bias. The segmental SNR is considered a better perceptual model since it evaluates the quantization noise with respect to the energy in each underlying speech segment.

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