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Improved frequency-domain error concealment

A frequency domain, error technology, applied in the field of frequency domain masking technology

Inactive Publication Date: 2011-08-10
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019]However, the error concealment technique proposed in [7] generally results in the so-called loss of vertical phase coherence, which leads to frame discontinuities and possible perceived artificial signs

Method used

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Embodiment Construction

[0055] In order to better understand the invention, the description begins with a short overview of common source coding applications involving the transmission of coded information over a communication channel. As mentioned earlier, a codec is an integrated device, circuit or computer program capable of processing a stream of information, and it generally includes an encoding part and a decoding part. Codecs are commonly used in the compression / decompression of information such as audio and video data for efficient transmission over band-limited communication channels.

[0056] In most state-of-the-art audio and video codecs, each frame of the input signal is decomposed in the frequency domain. The results of this analysis are coded and then transmitted. On the receiving side, this signal is recovered in the time domain by a synthesis process.

[0057] The basic idea of ​​encoding in the frequency domain is to divide the spectrum into frequency bands or components usually r...

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Abstract

The invention concerns a frequency-domain error concealment technique for information that is represented, on a frame-by-frame basis, by coding coefficients. The basic idea is to conceal an erroneous coding coefficient by exploiting coding coefficient correlation in both time and frequency. The technique is applicable to any information, such as audio, video and image data, that is compressed into coding coefficients and transmitted under adverse channel conditions. The error concealment technique proposed by the invention has the clear advantage of exploiting the redundancy of the original information signal in time as well as frequency. For example, this offers the possibility to exploit redundancy between frames (inter-frame) as well as within frames (intra-frame). The use of coding coefficients from the same frame as the erroneous coding coefficient is sometimes referred to as intra-frame coefficient correlation and it is a special case of the more general frequency correlation.

Description

technical field [0001] The present invention relates generally to bit error concealment, and more particularly to frequency domain concealment techniques for the decoding side of a codec, such as a subband codec or a transform codec. Background technique [0002] A media encoder is a device, circuit, or computer program capable of analyzing a stream of information, such as an audio, video, or image data stream, and outputting the stream in encoded form representing the media. The resulting information is often used for transmission, storage and / or encryption purposes. A decoder, on the other hand, is a device, circuit, or computer program capable of translating the operation of an encoder such that it receives an encoded information stream and outputs a decoded media stream. [0003] In most state-of-the-art audio and video encoders, each frame of the input signal is analyzed in the frequency domain. The results of the analysis are quantized and coded and then transmitted ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/00H04B1/66G10L19/005H04B
Inventor A·塔莱布
Owner TELEFON AB LM ERICSSON (PUBL)
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