METHOD AND DEVICE FOR ENCODING VOICE AND PARAMETER

摘要

PROBLEM TO BE SOLVED: To encode a voice pitch being an analysis/synthetic voice encoding parameter, voiced/unvoiced information and harmonic spectrum amplitude through the use of a small number of bits. SOLUTION: The sound pitch is encoded by changing-over a frame for quantization by the uniform/differential selection of a logarithm pitch and a frame for quantization by an inter-frame interpolation pitch candidate index. The voiced/unvoiced information is encoded by changing-over a frame for quantization by information of the voiced/unvoiced information which is selected from the representative voiced/unvoiced information and as frame without the transmission of voiced/unvoiced information. A harmonic spectrum amplitude string is made into a model by an autoregressive linear prediction model which is adjusted by spectrum. An LSP coefficient is encoded by changing-over a frame for vector quantization and a frame for quantization by an interpolation candidate index. An LPC gain is quantized by changing-over a frame for the uniform quantization of the logarithm gain and a frame for differential quantization or quantization by the interpolation candidate index after correcting the change of sound power which is generated by LSP coefficient quantization.