Noise feedback coding method and system for performing general searching of vector quantization codevectors used for coding a speech signal
Patent 6980951 Issued on December 27, 2005. Estimated Expiration Date: April 11, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
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
A 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
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April 11, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
