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1. WO2012064929 - DOWNMIX LIMITING

Publication Number WO/2012/064929
Publication Date 18.05.2012
International Application No. PCT/US2011/060128
International Filing Date 10.11.2011
Chapter 2 Demand Filed 12.06.2012
IPC
G10L 19/008 2013.01
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
19Speech or audio signal analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
008Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
CPC
G10L 19/008
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
19Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
008Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
H04S 2400/03
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS 
2400Details of stereophonic systems covered by H04S but not provided for in its groups
03Aspects of down-mixing multi-channel audio to configurations with lower numbers of playback channels, e.g. 7.1 -> 5.1
Applicants
  • DOLBY LABORATORIES LICENSING CORPORATION [US]/[US] (AllExceptUS)
  • WILSON, Rhonda [GB]/[US] (UsOnly)
  • WARD, Michael [GB]/[US] (UsOnly)
  • VENEZIA, Steven [US]/[US] (UsOnly)
  • DRESSLER, Roger [US]/[US] (UsOnly)
Inventors
  • WILSON, Rhonda
  • WARD, Michael
  • VENEZIA, Steven
  • DRESSLER, Roger
Agents
  • DOLBY LABORATORIES, INC.
  • DOLBY INTERNATIONAL AB PATENT GROUP EUROPE
Priority Data
61/413,23712.11.2010US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DOWNMIX LIMITING
(FR) LIMITATION DE MÉLANGE-ABAISSEMENT
Abstract
(EN)
The invention relates to downmixing techniques by which output audio signals are obtained from input audio signals partitioned into subgroups. A variable common gain limiting factor is applied to all downmix coefficients that govern the contributions from the input signals in a subgroup. While preserving the proportions between signal values within a subgroup, the invention makes it possible to limit the gain of different input signal subgroups to different extents, so that relatively more perceptible signals can be limited relatively less. It then becomes possible to achieve a consistent dialogue level while transitioning in a less perceptible fashion between signal portions with and without gain limiting. Embodiments of the invention include a method, a mixing system and a computer-program product.
(FR)
La présente invention concerne des techniques de mélange-abaissement grâce auxquelles des signaux de sortie audio sont obtenus à partir de signaux d'entrée audio partitionnés en sous-groupes. Un facteur de limitation de gain variable commun est appliqué à tous les coefficients de mélange-abaissement qui régissent les contributions des signaux d'entrée dans un sous-groupe. Tout en conservant les proportions entre les valeurs des signaux au sein d'un sous-groupe, l'invention permet de limiter le gain de différents sous-groupes de signaux d'entrée à des degrés différents, de sorte que les signaux relativement plus perceptibles peuvent être relativement moins limités. Il devient alors possible d'atteindre un niveau de dialogue constant lors de la transition, d'une façon moins perceptible entre des parties de signal avec ou sans limitation de gain. Des modes de réalisation de l'invention comprennent également un procédé, un système de mélange et un produit de programme d'ordinateur.
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