Encoding method, decoding method, encoding device and decoding device

Abstract

An embodiment of the invention provides an encoding method, a decoding method, an encoding device, a decoding device, a transmitter, a receiver and a communication system. The encoding method comprises dividing time-domain signals to be encoded into low-frequency-band signals and high-frequency-band signals; encoding the low-frequency-band signals to obtain low-frequency encoding parameters; encoding the high-frequency-band signals to obtain high-frequency encoding parameters, and obtaining composite high-frequency-band signals according to the low-frequency encoding parameters and the high-frequency encoding parameters; performing short-term post-filtering processing on the composite high-frequency-band signals to obtain short-term filtering signals, wherein spectral envelope shapes of the short-term filtering signals are closer to spectral envelope shapes of the high-frequency-band signals than spectral envelope shapes of the composite high-frequency-band signals; calculating high-frequency gains based on the high-frequency-band signals and the short-term filtering signals. By means of the encoding method, the decoding method, the encoding device and the decoding device, the encoding and / or decoding effect can be improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of communication, and more specifically, relate to an encoding method, a decoding method, an encoding device, a decoding device, a transmitter, a receiver, and a communication system. Background technique [0002] With the continuous advancement of communication technology, users have higher and higher requirements for voice quality. Typically, voice quality is improved by increasing the bandwidth for voice quality. If the traditional encoding method is used to encode the information with increased bandwidth, the code rate will be greatly increased, and therefore it is difficult to realize due to the limitation of the current network bandwidth. Therefore, to encode a signal with a wider bandwidth when the code rate remains unchanged or does not change much, the solution to this problem is to use the frequency band extension technology. Band extension techniques can be done in either t...

AI Technical Summary

Problems solved by technology

[0004] In the above technology of frequency band expansion in the time domain, the high frequency band signal is recovered under a certain rate condition, but the performance index is not perfect enough

By comparing the spectrum of the speech signal restored by decoding with the spectrum of the original speech signal, it can be seen that the restored speech signal sounds rustling and the sound is not clear enough

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