Patent · US Active

Selective bass post filter

US9224403B2 · kind B2 · utility

2Cited by

11References

16Claims

0Family size

Assignee

Dolby International AB · IE

Inventors

Barbara Resch · Solna, SE
Kristofer Kjorling · Solna, SE
Lars Villemoes · Stockholm, SE

Key dates

Filing date	Jun 23, 2011
Grant date	Dec 29, 2015
Priority date	—
Expiry date	Feb 4, 2032

Classification

Technology area (CPC G)Physics
CPC primaryG10L19/107
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

In one aspect, the invention provides an audio encoding method characterized by a decision being made as to whether the device which will decode the resulting bit stream should apply post filtering including attenuation of interharmonic noise. Hence, the decision whether to use the post filter, which is encoded in the bit stream, is taken separately from the decision as to the most suitable coding mode. In another aspect, there is provided an audio decoding method with a decoding step followed by a post-filtering step, including interharmonic noise attenuation, and being characterized in a step of disabling the post filter in accordance with post filtering information encoded in the bit stream signal. Such a method is well suited for mixed-origin audio signals by virtue of its capability to deactivate the post filter in dependence of the post filtering information only, hence independently of factors such as the current coding mode.

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