Patent · US Expired

Apparatus and method for encoding an audio signal and apparatus and method for decoding an encoded audio signal

US7275031B2 · kind B2 · utility

22Cited by

14References

11Claims

0Family size

Assignee

Coding Technologies AB · SE

Inventors

Holger Hoerich · Bad Mergentheim, DE
Michael Schug · Erlangen, DE
Matthias Neusinger · Meiningen, DE

Key dates

Filing date	Dec 22, 2005
Grant date	Sep 25, 2007
Priority date	—
Expiry date	Apr 26, 2026

Classification

Technology area (CPC G)Physics
CPC primaryG10L19/0212
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

When encoding an audio signal, the audio signal is first encoded with the first encoder to obtain a first encoder output signal. This first encoder output signal is written into a bit stream. It is further decoded by a decoder to provide a decoded audio signal. The decoded audio signal is compared with the original audio signal to obtain a residual signal. The residual signal is then encoded via a second encoder to provide a second encoder output signal which is also written into a bit stream. The first encoder has a first time or frequency resolution. The second encoder has a second time or frequency resolution. The first resolution differs from the second resolution, so that in a respective decoder, an audio signal with both a high time resolution as well as a high frequency resolution can be retrieved.

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