EP 2257083 B1 20111214 - Sound field control in multiple listening regions
Title (en)
Sound field control in multiple listening regions
Title (de)
Schallfeldsteuerung mit mehreren Hörbereichen
Title (fr)
Contrôle de champ sonore dans plusieurs régions d'écoute
Publication
Application
Priority
EP 09007142 A 20090528
Abstract (en)
[origin: EP2257083A1] The invention provides a scheme to design an audio precompensation controller for a multichannel audio system, with a prescribed number N of loudspeakers in prescribed positions so that listeners positioned in any of P>1 spatially extended listening regions should be given the illusion of being in another acoustic environments that has L sound sources (virtual loudspeakers) located at prescribed positions in a prescribed room acoustics. The invention provides a unified joint solution to the problems of equalizer design, crossover design, delay and level calibration, sum-response optimization and up-mixing. A multi-input multi-output audio precompensation controller is designed for an associated sound generating system comprising a limited number of loudspeaker inputs for emulating a number of virtual sound sources. The scheme for designing is based on: (S1) estimating, for each loudspeaker input signals, an impulse response at each of a set of measurement positions that cover the P listening regions; (S2) specifying a target impulse response (target stages) for each virtual sound source at each measurement position; and (S3) determining adjustable filter parameters of the audio precompensation controller so that a criterion function is optimized. The criterion function includes a weighted summation of powers of differences between the compensated estimated impulse responses and the target impulse responses over a discrete grid of said M measurement positions. This optimization can furthermore be iterated with a tuning of adjustable parameters in the target stages to improve the attainable criterion value and the accuracy of the compensation.
IPC 8 full level
H04S 7/00 (2006.01)
CPC (source: EP)
H04S 7/301 (2013.01); H04R 2499/13 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 2257083 A1 20101201; EP 2257083 B1 20111214; AT E537667 T1 20111215
DOCDB simple family (application)
EP 09007142 A 20090528; AT 09007142 T 20090528