Patent ID: 7013268
Filing Date: 2006-03-14
Classification: G10L

Abstract:
1. A speech encoder comprising: a first weighting means for performing an error weighting on a speech input, said first weighting means configured to reduce an error signal resulting from a difference between a first synthesized speech signal and said speech input; a means for generating the first synthesized speech signal from a first excitation signal; a second weighting means for performing an error weighting on the first synthesized speech signal, said second weighting means also configured to reduce the error signal resulting from the difference between the speech input and said first synthesized speech signal; a first difference means for taking the difference between the first synthesized speech signal and the speech input, said first difference means configured to produce a first weighted error signal; a means for generating a second synthesized speech signal from a second excitation signal; a third weighting means for performing an error weighting on the second synthesized speech signal, said third weighting means configured to reduce a second weighted error signal resulting from the difference between the first weighted error signal and said second synthesized speech signal; a second difference means for taking the difference between the second synthesized speech signal and the first error signal, said second difference means configured to produce the second weighted error signal; a feedback means for using the second weighted error signal to control the selection of the first excitation signal, and the selection of the second excitation signal.