Signal Decoding Method and Device

摘要

Embodiments of the present invention provide a signal decoding method and device. The method includes decoding a bit stream of a voice signal or an audio signal to acquire a decoded signal; predicting an excitation signal of an extension band according to the decoded signal, where the extension band is adjacent to a band of the decoded signal, and the band of the decoded signal is lower than the extension band; selecting a first band and a second band from the decoded signal, and predicting a spectral envelope of the extension band according to a spectral coefficient of the first band and a spectral coefficient of the second band; and determining a frequency-domain signal of the extension band according to the spectral envelope of the extension band and the excitation signal of the extension band.

主权项

1. A signal decoding method, comprising:
decoding a bit stream of a voice signal or an audio signal to acquire a decoded signal; predicting an excitation signal of an extension band according to the decoded signal, wherein the extension band is adjacent to a band of the decoded signal, and wherein the band of the decoded signal is lower than the extension band; selecting a first band and a second band from the decoded signal; predicting a spectral envelope of the extension band according to a spectral coefficient of the first band and a spectral coefficient of the second band, wherein a distance from a highest frequency bin of the first band to a lowest frequency bin of the extension band is less than or equal to a first value, and a distance from a highest frequency bin of the second band to a lowest frequency bin of the first band is less than or equal to a second value; and determining a frequency-domain signal of the extension band according to the spectral envelope of the extension band and the excitation signal of the extension band.