Residual excited predictive speech coding system
ADPCM System for speech or like signals
Speech analysis-synthesis apparatus and method
Resisting the effects of channel noise in digital transmission of information
Speech coding system
Method of and device for speech signal coding and decoding by parameter extraction and vector quantization techniques
Digital speech coder having improved vector excitation source
Voice signal encoding and decoding apparatus and method
Low-delay vector backward predictive coding of speech
ApplicationNo. 09832131 filed on 04/11/2001
US Classes:704/222, Vector quantization704/220, Analysis by synthesis704/230, Quantization341/118, CONVERTER COMPENSATION375/243, Correcting or reducing quantizing errors341/76, To or from differential codes704/223, Excitation patterns704/207, Pitch704/217Autocorrelation
ExaminersPrimary: Ometz, David L.
Assistant: Albertalli, Brian L.
Attorney, Agent or Firm
Foreign Patent References
AbstractA method of searching a plurality of Vector Quantization (VQ) codevectors for a preferred one of the VQ codevectors to be used as an output of a vector quantizer for encoding a speech signal, includes determining a quantized prediction residual vector, and calculating a corresponding unquantized prediction residual vector and the energy of the difference between these two vectors (that is, a VQ error vector). After trying each of the plurality of VQ codevectors, the codevector that minimizes the energy of the VQ error vector is selected as the output of the vector quantizer