Patent ID: 9666202
Date: 2017-05-30
CPC Classifications: G10L

Claim:
1. A method of decoding an encoded audio bitstream and generating frequency bandwidth extension at a CODEC, the method comprising: decoding the audio bitstream to generate a decoded low band audio signal and generate a low band excitation spectrum corresponding to a low frequency band; selecting a sub-band area from within the low frequency band using a parameter which indicates energy information of a spectral envelope of the decoded low band audio signal wherein the selected sub-band area is within a region corresponding to an energy peak of the spectral envelope; generating a high band excitation spectrum for a high frequency band by copying a sub-band excitation spectrum from the selected sub-band area to a high sub-band area corresponding to the high frequency band; generating an extended high band audio signal according to a high band spectral envelope and the generated high band excitation spectrum; and adding the extended high band audio signal to the decoded low band audio signal to generate an audio output signal having an extended frequency bandwidth.