Diffusion excitation vector generation method and diffusion excitation vector generator

摘要

PROBLEM TO BE SOLVED: To provide excellent synthesized sound which is obtained by a small amount of calculation and a small ROM capacity. SOLUTION: The sound decoding device is configured so that sound source vector creating information formed of the less number of pulses is stored in a sound source information storage part 1; any one of the followings: a random numeric array, a numeric array obtained by learning or finding is stored in a diffused vector storage part 2; also, the sound source information in the sound source information storage part 1 and the diffused vectors in the diffused vector storage part 2 are convoluted by a convolution part 3; and thus, diffused sound source vectors are created. The speech coding device is configured so that a new impulse response is created by convoluting the diffused vectors and the impulse response from a digital filter by the convolution part.