critical band vocoder (beaucham )


Subject: critical band vocoder
From:    beaucham  <beaucham@xxxxxxxx>
Date:    Wed, 17 May 2006 15:07:02 -0500

For many years vocoders were used for data reduction of speech signals. A vocoder separates the input signal into consecutive bands, codes the band outputs, and then transmits the coded information to a receiver for resynthesis. An early model of Bell Lab's vocoder used 20 uniform-width bands below 3000 Hz and 10 log-spaced bands above 3000 Hz, extending to 7500 Hz. Recently, mel-frequency cepstral coefficients have been popular for speech recognition. Mel frequency spacing is approximately proportional to critical-band frequency spacing. My question is: Has anyone designed and tested a vocoder using critical-band spacing of the filters? Jim Beauchamp Univ. of Illinois at Urbana-Champaign


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