Patent · US Active

System and method for non-destructively normalizing loudness of audio signals within portable devices

US8903729B2 · kind B2 · utility

34Cited by

0References

24Claims

0Family size

Assignees

Dolby Laboratories Licensing Corporation · US
Dolby International AB · IE

Inventors

Jeffrey Riedmiller · Penngrove, US
Harald Mundt · Fürth, DE
Michael Schug · Erlangen, DE
Martin Wolters · Wuppertal, DE

Key dates

Filing date	Feb 3, 2011
Grant date	Dec 2, 2014
Priority date	—
Expiry date	Feb 19, 2032

Classification

Technology area (CPC H)Electricity
CPC primaryH03G7/007
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

Many portable playback devices cannot decode and playback encoded audio content having wide bandwidth and wide dynamic range with consistent loudness and intelligibility unless the encoded audio content has been prepared specially for these devices. This problem can be overcome by including with the encoded content some metadata that specifies a suitable dynamic range compression profile by either absolute values or differential values relative to another known compression profile. A playback device may also adaptively apply gain and limiting to the playback audio. Implementations in encoders, in transcoders and in decoders are disclosed.

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