Dirac Research Ab

Adrian Bahne

Anders Ahlen

Lars-Johan Brännmark

Disclosed is a method for determining filter coefficients of an audio precompensation controller for the compensation of an associated sound system, including N&#x2265;2 loudspeakers, including estimating, for each one of at least a pair of the loudspeakers, a model transfer function at each of M control points distributed in Z&#x2265;2 spatially separated listening zones in a listening environment of the sound system. The method also includes determining, for each of the M control points, a zone-dependent target transfer function at least based on the zone affiliation of the control point; and determining the filter coefficients of the audio precompensation controller at least based on the model transfer functions and the target transfer functions of the M control points. Consequently, an audio precompensation controller for an associated sound system can be obtained that enables improved and/or customized sound reproduction in two or more listening zones simultaneously.

Personal multichannel audio controller design

Disclosed is a method and a system to determine an audio precompensation controller for an associated sound generating system including a total of N&#x2267;2 loudspeakers, each having a loudspeaker input. The audio precompensation controller has a number L&#x2267;1 inputs for L input signals and N outputs for N controller output signals, one to each loudspeaker. For each one of at least a subset of the N loudspeaker inputs, an impulse response is estimated at each measurement position. For each one of the L input signal(s), a selected one of the N loudspeakers is specified as a primary loudspeaker and a selected subset S including at least one of the N loudspeakers as support loudspeaker(s).

Audio precompensation controller design using a variable set of support loudspeakers

A method for determining an audio precompensation controller for an associated sound generating system comprising a total of N&#x2267;2 loudspeakers, each having a loudspeaker input. The audio precompensation controller has a number L&#x2267;2 inputs for L input signal(s) and N outputs for N controller output signals, one to each loudspeaker. It is relevant to: estimate (S), for each one of at least a subset of the N loudspeaker inputs, an impulse response at each measurement position; specify (S), for each one of the L input signal(s), a selected one of the N loudspeakers as a primary loudspeaker and optionally a selected subset S including at least one of the N loudspeakers as support loudspeaker(s); select (S) at least one loudspeaker pair, that is required to be symmetrical with respect to the listing position; and specify (S), for each primary loudspeaker, a target impulse response at each measurement position.

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Uppsala, Sweden

Adrian Bahne