QUANTIZED LSP PARAMETER DYNAMIC FEATURE EXTRACTOR AND QUANTIZED LSP PARAMETER DYNAMIC FEATURE EXTRACTING METHOD

摘要

PROBLEM TO BE SOLVED: To change the coding mode of a sound source section and efficiently code a speech signal without coding/transmitting mode information.;SOLUTION: An adder 606 calculates the difference between a smooth quantized LPS parameter at present processing unit time and another smooth quantized LPS parameter of the preceding processing unit time. A square sum calculating means 607 calculates the square sum of the difference for each order about output of the adder 606. An AR type average calculating means 611 calculates the average LSP parameter in a noise section. An adder 612 calculates the difference of the quantized LSP parameter at the present processing unit time and the average quantized LSP parameter in the noise section for each order. A square sum calculating means 613 calculates the square sum for each order about the adder 612. A speech section detecting means 619 determines whether or not an input signal in the present processing unit time be in the speech section.;COPYRIGHT: (C)2010,JPO&INPIT