Patent ID: 9704500
Date: 2017-07-11
CPC Classifications: G10L

Claim:
1. A method for reconstructing a high frequency band signal of an audio signal, performed by an audio signal decoding device, the method comprising: determining a signal type of the audio signal and obtaining a low frequency band signal of the audio signal, wherein the signal type of the audio signal is either harmonic or non-harmonic; obtaining a frequency envelope of the high frequency band signal of the audio signal according to the determined signal type; predicting an excitation signal of the high frequency band signal according to the low frequency band signal; and reconstructing the high frequency band signal according to the frequency envelope of the high frequency band signal and the excitation signal of the high frequency band signal; wherein a manner for obtaining the frequency envelope of the high frequency band signal when the signal type of the audio signal is harmonic is different from the manner for obtaining the frequency envelope of the high frequency band signal when the signal type of the audio signal is non-harmonic.