Patent ID: 7869990
Filing Date: 2011-01-11
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; 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; calculating, by the speech decoder, a first coefficient using a first equation based on the first summation and the second summation; calculating, by the speech decoder, a second coefficient using a second equation based on the first summation and the second summation, wherein the first equation and the second equation are obtained as results of setting to zero, where n is the number of the plurality of previous pitch lag parameters defined by P(i), and where P′(i) defines the predicted pitch lag parameter and where: wherein a is the first coefficient, and b is the second coefficient; 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.