| 摘要 |
<p>PURPOSE:To minimize a waveform distortion under a constant total information quantity by following a sound signal for an analyzing section to divide the sound signal for the number of plural samples and distributing adaptably the information quantity of a spectrum enveloping information code and the information quantity of a waveform information code. CONSTITUTION:Encoders 31, 32 and 33 composed of an estimation coefficient extracting part 12, an estimation residual extracting part 13, quantizing parts 14 and 17 and a reverse quantizing part 16 are provided, and in respective encoders, an input sound signal is quantized, for example, by three types of the information distributing method set beforehand as shown in the figure. Here, a total information quantity T per one analyzing section is fixed. Respective encoders are encoded respectively by the first, second, third information distributing methods in the figure. Respective encoding outputs are respectively encoded by a local decoding deciding part 34, the most desirable distributing method is obtained and a spectrum enveloping information code 35, a waveform information code 36 and a distributing information code 37 are transmitted to a decode side. The most desirable method means that a local decode signal and a local signal are compared, the quantizing distortion is obtained and this comes to be minimum.</p> |
