Patent · US Active

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

US8428941B2 · kind B2 · utility

4Cited by

14References

13Claims

0Family size

Assignee

Thomson Licensing · FR

Inventors

Johannes Boehm · Göttingen, DE
Peter Jax · Hannover, DE
Florian Keiler · Hannover, DE
Oliver Wuebbolt · Hannover, DE
Sven Kordon · Wunstorf, DE

Key dates

Filing date	Apr 18, 2007
Grant date	Apr 23, 2013
Priority date	—
Expiry date	Aug 5, 2030

Classification

Technology area (CPC G)Physics
CPC primaryG10L19/0017
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

In lossy based lossless coding a PCM audio signal passes through a lossy encoder to a lossy decoder. The lossy encoder provides a lossy bit stream. The difference signal between the PCM signal and the lossy decoder output is lossless encoded, providing an extension bit stream. The invention facilitates enhancing a lossy perceptual 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/de-coding.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.