| 摘要 |
PROBLEM TO BE SOLVED: To make a sound source coding to be multimode without newly transmitting mode information. SOLUTION: A square sum calculator 603 calculates the square sum of differences for every degree of a smoothed quantization LSP parameter. As a result, a first dynamic parameter is obtained. A square sum calculator 605 calculates the square sum by using square values of respective orders. This square sum becomes to be a second dynamic parameter. A maximum value calculator 606 selects the maximum value among the square values of respective orders and this becomes to be a third dynamic parametey. These first to third dynamic parameters are transmitted to a mode deciding unit 607 and the mode of a voice is decided by the threshold decision means to be outputted as mode information. |
