METHOD AND SYSTEM TO PLAY BACKGROUND MUSIC ALONG WITH VOICE ON A CDMA NETWORK

摘要

A method and system for compressing an audio signal. The method includes receiving a segment of an audio signal and selectively disabling noise suppression for the received segment. The segment is filtered in a noise-suppression module if noise suppression is not disabled. The method also includes calculating an autocorrelation coefficient and an LSP coefficient, predicting a short-term coefficient and long-term coefficients according to the LSP coefficient and calculating one or more bandwidth-expanded correlation coefficients. Further, the method includes determining the type of packet in which to encode the segment. An encoding rate is selected from among a full rate encode, a half-rate encode, and an eight-rate encode if noise suppression is not disabled. An encoding rate is selected from among a full rate encode and a half-rate encode if noise suppression is disabled. Furthermore, the segment is formed into a packet of the determined type and selected rate.

主权项

1. An apparatus for compressing an audio signal, comprising:
a readable medium for at least one of retrieving or archiving date; and a processor for performing a method, the method comprising:
receiving a segment of an audio signal;selectively disabling noise suppression;if noise suppression is not disabled, filtering the segment in a noise-suppression module;calculating an autocorrelation coefficient and an line spectral pairs (LSP) coefficient;predicting a short-term coefficient according to the LSP coefficient;predicting long-term coefficients according to the LSP coefficient;calculating one or more bandwidth-expanded correlation coefficients;determining, according to the short-term, the long-term, and the bandwidth-expanded correlation coefficients, a type of packet in which to encode the segment;selecting an encoding rate from among a full rate encode, a half-rate encode, and an eight-rate encode based on the noise suppression setting, wherein the setting is at least one of enabled or disabled based on the type of network and wherein a higher encoding rate is selected for transmitting to a mobile device; andforming the segment into a packet of the determined type and selected rate.