VECTOR QUANTIZER, VECTOR DEQUANTIZER, AND THE METHODS

摘要

A VECTOR QUANTIZER INCLUDES A CLASSIFIER (101) GENERATES CLASSIFICATION INFORMATION REPRESENTING A TYPE OF NARROWBAND LSP VECTOR HAVING THE CORRELATION WITH WIDEBAND LSP (LINE SPECTRAL PAIRS) OUT OF THE PLURAL TYPES. A FIRST CODEBOOK (103) SELECTS ONE SUB-CODEBOOK CORRESPONDING TO THE CLASSIFICATION INFORMATION AS A CODEBOOK USED FOR THE QUANTIZATION OF THE FIRST STAGE FROM PLURAL SUB-CODEBOOKS (CBal TO CBan) CORRESPONDING TO EACH OF THE TYPES OF NARROWBAND LSP VECTORS. A MULTIPLIER (107) MULTIPLIES THE QUANTIZATION RESIDUAL VECTOR OF THE FIRST STAGE INPUTTED FROM AN ADDER (104) BY A SCALING FACTOR CORRESPONDING TO THE CLASSIFICATION INFORMATION OUT OF PLURAL SCALING FACTORS STORED IN A SCALING FACTOR DETERMINING SECTION (106) AND OUTPUTS IT TO AN ADDER (109) AS THE QUANTIZATION TARGET OF A SECOND STAGE.