| 摘要 |
PURPOSE: To provide the code excited linear predictive speech encoding device which obtains not only a speech, but also a natural decoded sound even if a background noise, music, etc., are added to the speech. CONSTITUTION: The code excited linear predictive speech encoding device is equipped with a shape excitation source code book, which consists of plural subordinate code books; and the subordinate code books 106a and 106b consist of speech parts 106a-1 and 106b-1 consisting of signal source vectors learnt by using speech containing no noise and non-peech parts 106a-2 and 106b-2 consisting of signal source vectors learnt by utilizing non-speech signals other than the speech and random signal source vectors that are not learnt. Consequently, the quality is improved as compared with when the subordinate code books are composed of only the vectors of the speech parts 106a-1 and 106b-1 or non-speech parts 106a-2 and 106b-2. |
