Patent ID: 8392198
Filing Date: 2013-03-05
Classification: G10L

Abstract:
1. A method for encoding a wideband audio signal comprising: receiving a frame comprising a wideband audio signal, which includes a high band signal and a low band signal; encoding the low band signal to generate an encoded low band signal; determining whether the high band signal is perceptually relevant to the low band signal; if the high band signal is not perceptually relevant to the low band signal, providing for the frame an encoded audio signal containing the encoded low band signal, wherein the encoded audio signal does not include encoding parameters corresponding to characteristics of the high band signal; if the high band signal is perceptually relevant; wherein encoding the high band signal comprises: wherein a band of the predicted high band excitation pattern and the original high band excitation pattern is divided into N sub-bands, and determining the differences between the predicted high band excitation pattern and the original high band excitation pattern comprises determining a difference in corresponding energy levels in a plurality of the N sub-bands between the predicted high band excitation pattern and the original high band excitation pattern; and selecting at least one of the plurality of N sub-bands where the difference in the corresponding energy levels of the predicted high band excitation pattern and the original excitation pattern exceeds a defined amount, and generating the high band parameters from the original high band signal based on the differences in the corresponding energy levels in the at least one of the plurality of N sub-bands between the predicted high band excitation pattern and the original high band excitation pattern.