Embedded type coding, decoding method, encoder, decoder as well as system

An encoding method and a decoding method technology, applied in the field of encoder, embedded encoding, decoder and system, decoding method, can solve the problems of rejection, loss, distortion of synthesized speech, etc., to achieve the effect of quality assurance

Inactive Publication Date: 2008-09-03
BEIJING UNIV OF TECH +1
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  • Description
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Problems solved by technology

During network transmission, some packets may be lost during transmission; some packets have exceeded the maximum allowable transmission delay when they arrive at the receiving end and are rejected by the receiving end; the receiving end simulates the lost packets according to the received packets , and t

Method used

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  • Embedded type coding, decoding method, encoder, decoder as well as system
  • Embedded type coding, decoding method, encoder, decoder as well as system
  • Embedded type coding, decoding method, encoder, decoder as well as system

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Embodiment Construction

[0031] Embedded encoding is performed on the original speech, and a code stream with an embedded structure is obtained at the sending end. In the embedded code stream, symbols with a low code rate are embedded in code units with a high code rate, and code units with the lowest code rate It can also represent the main parameters of the original speech signal, but it loses some details to varying degrees compared to symbols of other code rates. When the network capacity is sufficient, high-rate code streams are transmitted in the network; when the network is congested in different degrees, according to the channel coding protocol, the symbols with higher code rates are gradually discarded, which can ensure that the synthesized voice contains the original voice signal The main parameters of , so as to avoid the distortion of synthesized speech.

[0032] The embedded structure layers the voice signal according to the required coding rate, and the coding rate of each layer increase...

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Abstract

The embodiment of the invention provides an embedded coding method, an embedded decoding method, a coder, a decoder and a system, the decoding method comprises the following steps of: performing an algebraic code excitation linear prediction ACELP coding to a voice signal to obtain a code stream of an ACELP layer; performing transform domain coding to the voice signal to obtain the code stream of a transform domain layer. Because the ACELP coding excites the signal through gradual thinning, the coding signal with lower code rate is corresponding to the excitation signal comprising less algebraic pulses; along with the rise of the code rate, the manner increasing the algebraic pulses gradually thins the excitation signal ceaselessly, when the algebraic pulses are increased to a certain number, the thinning effect to the excitation signals is inconspicuous or weaker, therefore the embodiment of the invention uses the united coding manners of the ACELP and transform domain coding to obtain the embedded code stream, and uses the transform domain coding to compensate the ACELP coding, guaranteeing the quality of synthesis voice.

Description

technical field [0001] The invention relates to the field of coding and decoding, in particular to embedded coding, a decoding method, a coder, a decoder and a system. Background technique [0002] As the IP telephony technology based on packet switching gets more and more applications, the voice packet transmission technology develops rapidly. At present, an urgent problem to be solved in the voice packet transmission technology is how to reduce the impact of packet loss on the synthetic voice quality at the receiving end. During network transmission, some packets may be lost during transmission; some packets have exceeded the maximum allowable transmission delay when they arrive at the receiving end and are rejected by the receiving end; the receiving end simulates the lost packets according to the received packets , and then obtain the synthesized voice according to the received grouping and the simulated grouping, the quality of the synthesized voice obtained in this wa...

Claims

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Application Information

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IPC IPC(8): G10L19/00G10L19/04G10L19/12G10L13/00H04L1/00G10L19/002G10L19/032
Inventor 鲍长春刘泽新范睿朱恒李海婷贾懋珅李锐李立雄
Owner BEIJING UNIV OF TECH
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