Patent ID: 7457746
Filing Date: 2008-11-25
Classification: G10L

Abstract:
1. A pitch lag prediction method for use by a speech decoder to generate a predicted pitch lag parameter, the pitch lag prediction method comprising: generating a first summation based on a plurality of previous pitch lag parameters, from previously received speech frames by the speech decoder, wherein the first summation is defined by where n is the number of the plurality of previous pitch lag parameters defined by P(i); generating a second summation based on the plurality of previous pitch lag parameters and a position of each of the plurality of previous pitch lag parameters with respect to the predicted pitch lag parameter, wherein the second summation is defined by calculating a first coefficient using a first equation based on the first summation and the second summation, wherein the first equation is defined by a=(3*sum calculating a second coefficient using a second equation based on the first summation and the second summation, wherein the second equation is defined by b=(sum predicting the predicted pitch lag parameter based on the first coefficient and the second coefficient; and generating a decoded speech signal using the predicted pitch lag parameter.