Patent · US Active

Apparatus and method for determining a quantizer step size

US7574355B2 · kind B2 · utility

3Cited by

18References

10Claims

0Family size

Assignee

Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

Bernhard Grill · Lautenbächle, DE
Michael Schug · Erlangen, DE
Bodo Teichmann · Ergolding, DE
Nikolaus Rettelbach · Nuremberg, DE

Key dates

Filing date	Aug 30, 2006
Grant date	Aug 11, 2009
Priority date	—
Expiry date	Jun 20, 2027

Classification

Technology area (CPC G)Physics
CPC primaryG10L2019/0005
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

For determining a quantizer step size for quantizing a signal including audio or video information, a first quantizer step size as well as an interference threshold are provided. Then, the actual interference introduced by the first quantizer step size is determined and compared with the interference threshold. Despite the fact that the comparison reveals that the actually introduced interference exceeds the threshold, a second, coarser quantizer step size is nevertheless used, which will then be used for quantization if it turns out that the interference introduced by the coarser, second quantizer step size falls below the threshold or falls below the interference introduced by the first quantizer step size. Thus, the quantization interference is reduced while the quantization is coarsened and, thus, the compression gain is increased.

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