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A transcoding method from g.729 to amr12.2 rate

A G.729AB, transcoding technology, applied in the field of signal processing, can solve the problems of long delay, high computational complexity, low voice quality, etc.

Active Publication Date: 2017-03-01
DALIAN UNIV OF TECH
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Problems solved by technology

Although this method can complete the transcoding operation between different encoders, it has disadvantages such as low voice quality after transcoding, high computational complexity, and long delay.

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  • A transcoding method from g.729 to amr12.2 rate
  • A transcoding method from g.729 to amr12.2 rate
  • A transcoding method from g.729 to amr12.2 rate

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing, the utility model is further described:

[0018] G.729AB and AMR are two widely used speech compression coding standards. G.729 is an 8kbps speech coding protocol formulated by the International Telecommunication Union (ITU) in 2006. G.729A is a simplified version of the G.729 standard; G.729B is a silent compression standard that cooperates with G.729(A); G .729AB refers to the voice coding standard that combines low-complexity G.729A and G.729B with silence compression function. It is the most widely used in practice and has been widely used in IP telephony, video conferencing systems and other fields. AMR is an adaptive multi-rate speech coding standard of WCDMA mobile communication system. It has 8 rates in total, of which 12.2kbps is its highest rate. This standard plays an important role in cellular mobile communication systems.

[0019] In order to realize the intercommunication between the IP phone and the cellula...

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Abstract

The invention discloses a G.729 to AMR12.2 rate transcoding method and belongs to the technical field of signal processing. According to the method, an input bit stream is input into a G.729AB decoding unit and then is decoded through the G.729AB decoding unit, the frame type, the LSP coefficient, the pitch delay, the fixed codebook vector, the codebook gain and the synthetic speech which are obtained through decoding are input into a G.729AB to AMR-12.2kbps transcoding unit so that each part can be transcoded correspondingly, and finally, each transcoded parameter is input into an AMR-12.2kbps coding unit and written into an output bit stream after being re-quantified according to an AMR-12.2kbps quantitative method.

Description

technical field [0001] The invention relates to a transcoding method from G.729 to AMR12.2 rate, belonging to the technical field of signal processing. Background technique [0002] The transmission and exchange of information is indispensable in contemporary people's life. Among many information data, voice data undoubtedly plays a decisive role. Digital voice communication has the advantages of high reliability and high anti-interference ability. With the continuous development of communication technology, its proportion is increasing. In order to improve communication efficiency, digital voice compression coding technology has been widely used, and various voice compression coding standards have emerged. In order to ensure the interoperability between the Internet, the seamless connection between speech coders becomes more and more important. To realize the smooth conversion of voice code streams between different networks, it is necessary to convert the code stream of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
Inventor 陈喆殷福亮李腾
Owner DALIAN UNIV OF TECH
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