Method for filling opening son (sub) tape using encoding index as well as method for generating encoding index

A technology of coding index and filling method, which is applied in the field of blank subband filling to reduce adverse effects and improve sound quality

Inactive Publication Date: 2008-10-08
WUHAN UNIV
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Problems solved by technology

[0005] The present invention provides a method for filling vacant subbands and a method for generating a coding index by using coding indexes, so as to solve the problem of spectral holes in the process of scalable coding and decoding and improve the decoding sound quality

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  • Method for filling opening son (sub) tape using encoding index as well as method for generating encoding index
  • Method for filling opening son (sub) tape using encoding index as well as method for generating encoding index
  • Method for filling opening son (sub) tape using encoding index as well as method for generating encoding index

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Embodiment Construction

[0023] The present invention provides a method for filling vacant subbands realized by using coding indexes, comprising the following steps:

[0024] Step 1, receiving the coded code stream, obtaining the core layer coding index, the first enhancement layer coding index and the second enhancement layer coding index in the coded code stream;

[0025] Step 2, determining the first enhancement layer decoding information according to the first enhancement layer coding index, and determining the second enhancement layer decoding information according to the second enhancement layer coding index;

[0026] Step 3, according to the decoding information of the first enhancement layer and the decoding information of the second enhancement layer, the unquantized subbands are filled and post-smoothed, including the following two steps,

[0027] Step 3.1, preliminarily filling high-frequency components that cannot be decoded by the second enhancement layer according to the decoding informa...

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Abstract

The present invention provides a blank sub-band filling method, which comprises: receiving a code stream, and obtaining the encoding index for the first reinforcement layer and the encoding index for the second reinforcement layer; determining the decoding information according to the encoding index for the first reinforcement layer, and determining the decoding information according to the encoding index for the second reinforcement layer; filling and smoothing the unquantized sub-band according to the decoding information, filling preliminarily the high-frequency part of the second reinforcement layer that can't be decoded according to the decoding information of the first reinforcement layer, and smoothing the filled sub-band and adjacent sub-bands. A bandwidth expansion parameter encoding method is used for the first reinforcement layer to create the encoding index; for the second reinforcement layer, the low-frequency residual error signal and high-frequency signal are converted to the frequency domain and then quantized, and the vector quantization encoding index is used as the encoding index for the second reinforcement layer. The present invention can effectively reduce the adverse effect of frequency spectrum cavity phenomenon to the decoded signals, and thereby improve the acoustic quality of the decoded signals.

Description

technical field [0001] The invention belongs to scalable coding and decoding, and in particular relates to a method for filling vacant sub-bands realized by using coding indexes and a method for generating coding indexes. Background technique [0002] Scalable codec technology divides the code stream into a core layer and multiple enhancement layers. The core layer guarantees the lowest reconstruction quality of the signal, and the enhancement layer gradually improves the reconstruction quality by improving the signal-to-noise ratio or expanding the frequency band. The more enhancement layers received, the higher the decoded encoded sound quality. The scalable coding method adapts to network bandwidth fluctuations by directly discarding enhancement layer streams. [0003] In the process of scalable coding and decoding, if the code rate is low and the coding bits are not enough to encode the full-band signal, there will be holes in the spectrum of the decoded signal, which w...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/08G10L19/002
Inventor 胡瑞敏周成杨玉红高戈谢昭
Owner WUHAN UNIV
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