Method and system for multi-channel audio encoding and decoding with backward compatibility based on maximum entropy rule

An audio encoding and multi-channel technology, applied in the field of backward compatible multi-channel audio encoding and decoding methods and systems, capable of solving problems such as achieving a good compromise

Active Publication Date: 2009-07-15
ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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  • Application Information

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Problems solved by technology

Despite these efforts, however, a good trade-off between bit rate, quality and complexity has not been achieved so far, and simpler and more efficient multi-pass encoding methods for different applications are highly desirable

Method used

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  • Method and system for multi-channel audio encoding and decoding with backward compatibility based on maximum entropy rule
  • Method and system for multi-channel audio encoding and decoding with backward compatibility based on maximum entropy rule
  • Method and system for multi-channel audio encoding and decoding with backward compatibility based on maximum entropy rule

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Embodiment 1

[0052] Embodiment 1: the encoding and decoding method proposed in the present invention is as figure 1 , figure 2 and image 3 , where six channels are taken as an example without loss of generality. Denote the six channels (5.1) (left, right, center, left surround, right surround and low frequency effects signal).

[0053] Encoding steps (such as figure 1 shown):

[0054] 1. To channel l (n), r (n), ls (n) and rs (n) (certainly, also depending on different situations, carry out M point half-length overlapping window FFT (step 100 to other part or all channels) ) to obtain their frequency responses L(m), R(m), LS(m) and RS(m) respectively (reference value M=1024, other reference values ​​can be used according to practical applications).

[0055] 2. the frequency spectrum of these four channels is divided into up to 25 sub-bands (step 102) according to critical band analysis, see the following table:

[0056] Table 1

[0057]

[0058] (It should be noted that in th...

Embodiment 2

[0107] Embodiment 2: the encoding and decoding system proposed in the present invention is as Figure 5 , Image 6 and Figure 7 , where six channels are taken as an example without loss of generality. Denote the six channels (5.1) (left, right, center, left surround, right surround and low frequency effects signal).

[0108] Coding system:

[0109] like Figure 5 and Image 6 As shown, the coding system includes a transformation device 500 , a division device 502 , a calculation device 504 , a mapping device 506 , an encoding device 508 and a packaging device 510 . Transformation device 500 performs M-point half-length overlapping window FFT on channels l(n), r(n), ls(n) and rs(n) (of course, other part or all of the channels may also be used in different situations), so as to Obtain their frequency responses L(m), R(m), LS(m) and RS(m) respectively (reference value M=1024, other reference values ​​can be used according to practical applications). Then, the division m...

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Abstract

A method and system for multi-channel audio encoding and decoding with backward compatibility based on the null field information maximum entropy rule is disclosed. The technical solution can adopt any existing stereo channel encoding system to encode the multi-channels audio signal, so as to transmit the multi-channel audio signal at the low bit rate identical with that of the stereo audio signal. It is more important that the existing stereo channel reproducing system can reproduce the audio format which utilizing the encoding method.

Description

technical field [0001] The present invention relates to an encoding and decoding method and system, in particular to a backward compatible multi-channel audio encoding and decoding method and system in the sense of maximum entropy. Background technique [0002] In modern multimedia and communication systems, the use of multi-channel audio transmission technology is increasing. However, it remains difficult to deliver multi-channel audio content in an efficient manner in mobile multimedia systems such as handheld devices. This is because multi-channel encoding systems require higher bit rates and are more complex than stereo-channel or single-channel systems. Many multi-channel audio coding systems have been proposed and some of them have been selected and recommended by relevant standards experts. Despite these efforts, a good trade-off between bit rate, quality and complexity has not been achieved so far, and simpler and more efficient multi-pass encoding methods for diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/00G10L19/00G10L19/008G10L19/02G10L25/27
CPCG10L25/27H04S2420/07G10L19/008H04S2400/03G10L19/0212H04S2400/01H04S3/008H04R2499/11
Inventor 罗发龙胡胜发万享
Owner ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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