Patent ID: 8370154
Filing Date: 2013-02-05
Classification: G10L

Abstract:
1. A method for generating an excitation signal for background noise, comprising: generating a quasi excitation signal of a speech frame by utilizing an excitation signal and a pitch lag in a speech coding and/or decoding stage and a transition length of the excitation signal; and obtaining the excitation signal for background noise in a transition stage by generating a weighted sum of the quasi excitation signal and a random excitation signal of a background noise frame based on the following equation: where cur _exc(n) is the excitation signal for background noise in the transition stage, pre_exc(n) is the quasi excitation signal of the speech frame, random_exc(n) is the random excitation signal, a(n) and β(n) are weighting factors of the quasi excitation signal and the random excitation signal respectively, and n is a sampling point of a signal frame.