发明名称 |
Method and apparatus for lossless encoding of a source signal, using a lossy encoded data stream and a lossless extension data stream |
摘要 |
In lossy based lossless coding a PCM audio signal passes through a lossy encoder (101) to a lossy decoder (102). The lossy encoder provides a lossy bit stream (111). The lossy decoder also provides side information (115) that is used to control (105) the coefficients (118) of a prediction filter (106) that de-correlates the difference signal (104) between the PCM signal and the lossy decoder output. The de-correlated difference signal is lossless encoded (108), providing an extension bit stream (121). Instead of, or in addition to, de-correlating in the time domain, a de-correlation in the frequency domain using spectral whitening can be performed. The lossy encoded bit stream together with the lossless encoded extension bit stream form a lossless encoded bitstream. The invention facilitates enhancing a lossy perceptual audio encoding/decoding by an extension that enables mathematically exact reproduction of the original waveform, 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.
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申请公布号 |
EP1852849(A1) |
申请公布日期 |
2007.11.07 |
申请号 |
EP20060113596 |
申请日期 |
2006.05.05 |
申请人 |
DEUTSCHE THOMSON-BRANDT GMBH |
发明人 |
JAX, PETER;KEILER, FLORIAN;NIEMEYER, OLIVER;KORDON, SVEN;BOEHM, JOHANNES |
分类号 |
G10L19/00;G10L19/04;G10L19/14 |
主分类号 |
G10L19/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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