Encoding method, decoding method, encoding device and decoding device

Abstract

The embodiment of the present 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 includes: dividing the time-domain signal to be encoded into a low-frequency band signal and a high-frequency band signal; encoding the low-frequency band signal to obtain low-frequency encoding parameters; encoding the high-frequency band signal to obtain high-frequency encoding parameters parameters, and according to the low-frequency encoding parameters and the high-frequency encoding parameters to obtain a synthetic high-band signal; short-term post-filtering is performed on the synthetic high-band signal to obtain a short-term filtered signal, the short-term filtered signal The shape of the spectral envelope of the synthesized high-band signal is closer to the shape of the spectral envelope of the high-band signal than the shape of the spectral envelope of the synthesized high-band signal; based on the high-band signal and the short-term filtering signal to calculate the high frequency gain. In the technical solutions of various embodiments of the present invention, 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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