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JND's in the LPC poles of speech and their application to quantization of the LPC filter

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3 Author(s)
Erell, A. ; Dept. of Electron. Syst., Tel Aviv Univ., Ramat Aviv, Israel ; Orgad, Y. ; Goldstein, J.L.

For the purpose of guiding a pole quantization scheme, a psychophysical experiment was performed to measure just-noticeable differences (JND) in the frequency and radius of the poles. The frequency JNDs, measured up to a formant frequency of 4 kHz, are quantified as distributions with means that are increasing functions of formant frequency and bandwidth. An example of a pole quantization scheme, based on the JND data, is presented and found to be significantly superior to common scalar quantization methods of the LPC-PARCOR coefficients. The pole quantization scheme is found to be almost comparable, both in quality and bit consumption, to vector quantization

Published in:

Signal Processing, IEEE Transactions on  (Volume:39 ,  Issue: 2 )

Date of Publication:

Feb 1991

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