Voice analysis-synthesis method using noise having diffusion which varies with frequency band to modify predicted phases of transmitted pitch data blocks

A voice analysis-synthesis method, comprising the steps of:

• dividing an input voice signal on a block-by-block basis and extracting pitch data from each block;
• converting the voice signal, on the block-by-block basis, into frequency-domain data;
• dividing the frequency-domain data for each of the blocks into plural bands of data on the basis of the pitch data, each of said bands corresponding to a different range of frequencies;
• finding power information for each of the bands of said each of the blocks and voiced/unvoiced decision information for said each of the bands of said each of the blocks;
• transmitting the pitch data, the power information for said each of the bands of said each of the blocks, and the voiced/unvoiced decision information for said each of the bands of said each of the blocks;
• receiving the pitch data, the power information, and the voiced/unvoiced decision information, and predicting a block terminal edge phase for each block of the received pitch data on the basis of said each block of the received pitch data and a block initial phase for said each block of the received pitch data;
• and
• modifying the predicted block terminal edge phase, using noise having diffusion which varies from band to band for each of the bands.