| 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. In the embodiments of the present invention, a spectral envelope and an excitation signal of an extension band are separately predicted according to a decoded signal obtained from a bit stream of a voice signal or an audio signal, so that a frequency-domain signal of the extension band of the voice or audio signal can be determined, and therefore performance of the voice or audio signal can be improved. |
