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Encoding and decoding method and encoding and decoding device for enhancing dual-track voice frequency and tone quality

An enhanced coding, two-channel technology, applied in the field of audio compression, can solve the problems of spectral information loss, reconstruction signal distortion, etc.

Inactive Publication Date: 2012-10-17
WUHAN UNIV
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Problems solved by technology

[0004] In order to solve this problem, the present invention proposes a binaural audio sound quality enhancement coding scheme, which can effectively solve the problem of spectral information loss caused

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  • Encoding and decoding method and encoding and decoding device for enhancing dual-track voice frequency and tone quality
  • Encoding and decoding method and encoding and decoding device for enhancing dual-track voice frequency and tone quality
  • Encoding and decoding method and encoding and decoding device for enhancing dual-track voice frequency and tone quality

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Embodiment Construction

[0081] The present invention proposes a two-channel audio sound quality enhancement method and a corresponding two-channel decoding method. During encoding, after the zone is divided, the two-channel sub-band signal is spectrum analyzed, the LPC coefficients of the sub-bands with large spectral differences between the sub-bands are extracted, and the LPC coefficients are used to decode the two-channel signal during decoding. Make certain corrections to make it have more spectral details and better subjective sound quality. During specific implementation, those skilled in the art can use computer software means to implement automatic audio encoding and decoding according to the provided technical solutions. In coding and decoding applications, it is often possible to solidify the coding and decoding software methods to form a coding and decoding device. Therefore, the present invention also provides a corresponding two-channel audio sound quality improvement encoder and decoder....

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Abstract

The invention provides an encoding and decoding method and encoding and decoding device for enhancing dual-track voice frequency and tone quality. The encoding and decoding method is to extract sub-bands with obvious frequency spectrum differences for linear prediction analysis and to amend decoded frequency spectrums of signals during decoding. According to the method and the device, based on the dual-track technology, the problem that distortion is caused during frequency downward conversion and parameter encoding due to obvious differences between dual tracks is solved; and the encoding quality of voice frequency is enhanced, so that rebuilt signals have completer frequency spectrum information.

Description

Technical field [0001] The invention relates to the technical field of audio compression, in particular to a dual-channel audio sound quality enhancement solution. Background technique [0002] With the rapid development of information technology in the new century, audio compression technology has been widely used. In the current two-channel audio coding standards, such as HE-AAC and MPEG-Surround, their parametric stereo coding provides excellent quality audio signals and relatively low coding bit rates. In the usual parametric stereo encoder, the time-frequency transformed signal is sub-band divided, and then the sub-band signal after the sub-band division is directly parametric stereo coded, the spatial parameters are extracted, and the two sound The channels are merged into one channel, and then the core encoder encodes the one channel. When decoding, the signal is reconstructed using spatial parameters. [0003] However, this process of downmixing multiple channels into on...

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Application Information

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IPC IPC(8): G10L21/02G10L19/02H04S1/00
Inventor 胡瑞敏董石郑翔涂卫平王晓晨高戈杨玉红刘梦颖
Owner WUHAN UNIV
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