Method and device for lowering redundancy rate of multi-description coding and decoding

A multi-description, redundant technology, applied in the field of wireless communication, can solve the problem of high redundancy in multi-description coding code rate, and achieve the effect of reducing redundancy and reducing code rate

Inactive Publication Date: 2012-04-04
GLOBAL INNOVATION AGGREGATORS LLC
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Problems solved by technology

[0004] However, the inventor found in the process of implementing the present invention that the code rate redundancy in the existing multi-description coding is too high

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  • Method and device for lowering redundancy rate of multi-description coding and decoding
  • Method and device for lowering redundancy rate of multi-description coding and decoding
  • Method and device for lowering redundancy rate of multi-description coding and decoding

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Embodiment Construction

[0028] The original audio signal after window selection is divided into two channels, one of which is sent to the time-frequency analysis module, and the modified discrete coherent transform (MDCT) is used for time-frequency analysis to obtain MDCT coefficients in the frequency domain. The function of the time-frequency analysis process is to transform or filter the time-domain audio signal, so as to remove the redundancy caused by the correlation in the original time-domain audio signal. Transform-based time-frequency analysis can use Modified Discrete Cosine Transform (MDCT), Modulated Laminated Transform (MLT) or Discrete Wavelet Transform (DWT), etc. Transform-based time-frequency analysis obtains audio parameters in transform domain or frequency domain; based on The time-frequency analysis of filtering can use the sub-band filtering algorithm similar to that used in MPEG-1 and MPEG-2 audio coding, and then perform time-frequency transformation in each sub-band, such as mod...

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Abstract

The embodiment of the invention discloses a method for lowering the redundancy rate of multi-description coding and decoding. The method comprises the following steps: acquiring a current frame masking threshold and a previous frame masking threshold; predetermining the current frame masking threshold according the current frame masking threshold and the previous frame masking threshold so as to obtain a predetermined differential signal; carrying out primary description coding on the current frame masking threshold; and carrying out secondary description coding on the predetermined differential signal. The embodiment of the invention also discloses the method and a device for reducing the redundancy rate of multi-description coding and decoding. The embodiment of the invention can lower the code rate of multiple description coding, and solves the problem of the prior art that the redundancy rate of multiple description coding is too high.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method and a device for reducing the redundancy of multiple description encoding and decoding. Background technique [0002] With the rapid development of modern IP network and mobile network technology, real-time high-quality audio services are integrated into various modern communication systems. However, communication networks based on packet switching, such as the Internet and 3G mobile networks, will inevitably face packet loss and long delay problems in actual operation due to network congestion, channel interference and noise. The problem is far from being effectively resolved. [0003] Multiple Description Coding (MDC, Multiple Description Coding) is a source coding technology for transmitting information in unreliable networks. A method of redundancy is introduced to provide a robust source coding algorithm against packet loss. Multi-description coding uses mul...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/00H03M7/30G10L19/02
CPCG10L19/02
Inventor 詹五洲杨智勇
Owner GLOBAL INNOVATION AGGREGATORS LLC
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