Patent · US Active

Coding of spectral coefficients of a spectrum of an audio signal

US10115401B2 · kind B2 · utility

9Cited by

3References

19Claims

0Family size

Inventors

Guillaume Fuchs · Erlangen, DE
Matthias Neusinger · Meiningen, DE
Markus Multrus · Nuremberg, DE
Stefan Doehla · Erlangen, DE

Key dates

Filing date	Jan 2, 2018
Grant date	Oct 30, 2018
Priority date	—
Expiry date	Jan 2, 2038

Classification

Technology area (CPC G)Physics
CPC primaryG10L19/02
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

A coding efficiency of coding spectral coefficients of a spectrum of an audio signal is increased by en/decoding a currently to be en/decoded spectral coefficient by entropy en/decoding and, in doing so, performing the entropy en/decoding depending, in a context-adaptive manner, on a previously en/decoded spectral coefficient, while adjusting a relative spectral distance between the previously en/decoded spectral coefficient and the currently en/decoded spectral coefficient depending on an information concerning a shape of the spectrum. The information concerning the shape of the spectrum may have a measure of a pitch or periodicity of the audio signal, a measure of an inter-harmonic distance of the audio signal's spectrum and/or relative locations of formants and/or valleys of a spectral envelope of the spectrum, and on the basis of this knowledge, the spectral neighborhood which is exploited in order to form the context of the currently to be en/decoded spectral coefficients may be adapted to the thus determined shape of the spectrum, thereby enhancing the entropy coding efficiency.

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