| 摘要 |
PROBLEM TO BE SOLVED: To perform an encoding process excellently even if a non-speech signal is inputted by continuously outputting the spectrum parameter of a precedent frame to a linear predictive analyzing means (LPC analyzer) when the non-speech signal lasts. SOLUTION: A buffer memory 1 sends out an input signal in frame units to a subframe divider 7 and a speech discrimination unit 2. A switch control circuit 3 sets a variable (i) indicating the number of successive non-sound frames to 0 when encoding is started. Then, when the speech discrimination unit 2 discriminates as a non-speech signal, the variable (i) is increased by one and it is judged whether or not the variable (i) is a specific number R(e.g. 10). When the variable (i) is larger than the specific number R, a terminal of a changeover switch 4 is closed to a side (a). The LPC analyzer 5 continuously outputs the spectrum parameter of the precedent frame. |
