| 摘要 |
In a sound encoding/decoding process, a sound signal is subjected to compression encoding and converted into a digital signal, and a high quality sound is reproduced from a little amount of information. In a code excited linear prediction (CELP) sound encoding process, the degree of noise of the sound in the encoding section is evaluated by using at least one code of spectrum information, power information and pitch information or by using the result of the encoding. In accordance with the evaluation result, different exciting code tables (19 and 20) are used. |
