The equipment impairment factor methodology adopted by the ITU-T for describing perceptual quality degradations associated with nonwaveform telephone speech codecs is discussed with regard to other degradations of the transmission channel. A new algorithm allows such factors to be calculated from the results of auditory tests, and first steps toward a derivation by means of instrumental models are presented. Limitations of the current approach for codec tandems are pointed out.
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https://aes2.org/publications/elibrary-page/?id=11066
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