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Method and apparatus for lossless encoding of a source signal using a lossy encoded data stream and a lossless extension data stream

A lossless encoding, data streaming technology, applied in code conversion, measuring fluid pressure, speech analysis, etc., can solve problems such as poor signal correlation

Active Publication Date: 2009-05-13
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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Problems solved by technology

[0007] Because a lossy encoder generates an error signal S proportional to the masking threshold in the frequency domain Diff , so the signal is not well decorrelated, so the signal is suboptimal for entropy coding

Method used

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  • Method and apparatus for lossless encoding of a source signal using a lossy encoded data stream and a lossless extension data stream
  • Method and apparatus for lossless encoding of a source signal using a lossy encoded data stream and a lossless extension data stream
  • Method and apparatus for lossless encoding of a source signal using a lossy encoded data stream and a lossless extension data stream

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Embodiment Construction

[0074] The present invention uses an improved lossy coder (such as Figure 4 The shown encoder 41) solves the problem of sub-optimal decorrelation based on lossy lossless coding. In addition to the original input signal S PCM In addition to generating a compliant lossy bitstream 411, the encoder produces special spectral whitening data which, among other information, is sent as side information 412 to a corresponding improved lossy decoder 42 and sent to the lossless encoder and packer 45 which outputs a lossless extended bitstream. The lossy encoder 41 is shown in more detail in FIG. 6 . Follow the combination of Figure 6 and Figure 7 As explained, spectral whitening data is formed. In the improved lossy decoder 42, the lossy bitstream 44 is decoded and the spectrum of the current frame of the input signal is recovered, thereby adding spectral whitening data from the signal 412 to the spectrum. Thereafter, a synthesis filter bank is applied in decoder 42, and in subtrac...

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Abstract

In lossy based lossless coding a PCM audio signal passes through a lossy encoder (41) to a lossy decoder (42). The lossy encoder provides a lossy bit stream. The difference signal (SDiff) between the PCM signal and the lossy decoder output is lossless encoded (52), providing an extension bit stream. The invention facilitates enhancing a lossy percep tual audio encoding / decoding by an extension that enables mathematically exact reproduction of the original waveform using enhanced de-correlation, and provides additional data for reconstructing at decoder site an intermediate-quality audio signal. The lossless extension can be used to extend the widely used mp3 encoding / decoding to lossless encoding / decoding and superior quality mp3 encoding / decoding.

Description

technical field [0001] The present invention relates to a method and a device for losslessly encoding a source signal using a lossy encoded (encoded) data stream and a lossless extension data stream, wherein the lossy encoded data stream and the lossless extension data stream together form the source signal Lossless encoded data stream. Lossy perceptual audio coding data is enhanced by extension data that enables mathematically accurate (lossless) reproduction of the original audio signal waveform. Background technique [0002] exist figure 1 The fundamentals of lossless audio coding are described in . The digital PCM audio signal samples are not independent of each other. Signal decorrelation 11 is used to reduce this dependency prior to entropy encoding 12 . The process needs to be reversible to be able to recover the original signal. Existing decorrelation techniques use linear predictive filtering (also known as linear predictive coding LPC), integer filter-banks, a...

Claims

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Application Information

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IPC IPC(8): G01L19/00G10L19/14G10L19/00G10L19/24
CPCG10L19/24G10L19/0017H03M7/30G10L19/00G10L19/02
Inventor 约翰尼斯·伯姆彼得·杰克斯弗洛里安·凯勒奥利弗·乌伯特斯文·科登
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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