A speech communication system using a code excited linear prediction speech decoder. The decoder using a first codebook containing a first digital value sequence selected from the set of binary values {0, 1}. The decoder also using a second codebook containing a second digital value sequence having values...http://www.google.com/patents/US6240382?utm_source=gb-gplus-sharePatent US6240382 - Efficient codebook structure for code excited linear prediction coding
