Audio precompensation controller design with pairwise loudspeaker channel similarity

摘要

A method for determining an audio precompensation controller for an associated sound generating system comprising a total of N≧2 loudspeakers, each having a loudspeaker input. The audio precompensation controller has a number L≧2 inputs for L input signal(s) and N outputs for N controller output signals, one to each loudspeaker. It is relevant to: estimate (S1), for each one of at least a subset of the N loudspeaker inputs, an impulse response at each measurement position; specify (S2), 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 (S2) at least one loudspeaker pair, that is required to be symmetrical with respect to the listing position; and specify (S3), for each primary loudspeaker, a target impulse response at each measurement position.

主权项

1. A method for determining an audio precompensation controller for an associated sound generating system comprising a total of N≧2 loudspeakers, each of said loudspeakers having a loudspeaker input, said audio precompensation controller having a number L≧2 inputs for L input signals and N outputs for N controller output signals, one to each loudspeaker of said sound generating system, said audio precompensation controller having a number of adjustable filter parameters, said method comprising the steps of:
estimating, for each one of at least a subset of said N loudspeaker inputs, an impulse response at each of a plurality M≧2 of measurement positions, distributed in a region of interest in a listening environment, based on sound measurements at said M measurement positions; specifying, for each one of said L input signals, a selected one of said N loudspeakers as a primary loudspeaker; specifying, for each of the L input signals, a loudspeaker pair, if feasible, where said loudspeaker pair is required to be symmetric, or similar, with respect to the listening position; specifying, for each primary loudspeaker, a target impulse response at each of said M measurement positions; and determining, for each one of said L input signals, based on the selected primary loudspeaker and the selected loudspeaker pair, filter parameters of said audio precompensation controller so that a criterion function is optimized under the constraint of stability of the dynamics of said audio precompensation controller, with said criterion function including a weighted summation of powers of differences between the compensated estimated impulse responses and the target impulse responses over said M, or a subset of said M, measurement positions, and a weighted and permuted summation of powers of differences between at least one pair of equalized symmetrical room transfer functions.