Patent ID: 6202045
Filing Date: 2001-03-13
Classification: G10L

Abstract:
A method of coding a sampled speech signal, the method comprising dividing the speech signal into sequential frames and, for each current frame:generating a first set of linear prediction coding (LPC) coefficients which correspond to the coefficients of a linear filter and which are representative of short term redundancy in the current frame;if the number of LPC coefficients in the first set of the current frame differs from the number in the first set of the preceding frame, then generating a second expanded or contracted set of LPC coefficients from the first set of LPC coefficients generated for the preceding frame, the second set containing a number of LPC coefficients equal to the number of LPC coefficients in said first set of the current frame; andencoding the current frame using the first set of LPC coefficients of the current frame and the second set of LPC coefficients of the preceding frame.