Improved MIMO control method; Associated control system and computer program.

Abstract

Improved MIMO control method; Associated control system and computer program.This method for controlling an acoustic field, which is generated by a sound reproduction system comprising a plurality of loudspeakers, is implemented by a control system connected to the loudspeakers and comprising a plurality of microphones positioned in the listening area, the method, implemented by a computer, consisting of: defining (111) first and second frequency bands in the operating range of the sound reproduction system; acquiring (113) a response matrix (H) of the loudspeakers; defining (115) a first target (d(1)) for the first band and a second target (d(2)) for the second band; determining (117) a first filter (g(1)) for the first band from the response matrix (H) and the first target and a second filter (g(2)) for the second band from the response matrix (H) and the second target; and combining (119) the first and second filters to obtain the overall filter.Figure for abstract: Figure 2.

Description

for the first band and a second target (^2D for the second band, and determining a global filter (8) consists of first combining (216) the first and second targets to obtain a global target (d), then determining (217) by optimization the global filter from the response matrix (#) and the global target (&). [Claim 4] MIMO control method according to claim 1, wherein, defining a first filter optimization strategy on the first frequency band and a second filter optimization strategy on the second frequency band consists of defining (315) a first target ( j(Û) for the first band and a second target Q / ®) for the second band, and determining a global filter (8) consists of: - filtering (316) the response matrix (H) on the first frequency band, respectively on the second frequency band, to obtain a first response matrix ( / / ^),respectively a second response matrix (h(2^; - determining (117) by optimization a first filter (^b) for the first band from the first response matrix and the first target and a second filter (g*2^) for the second band from the second response matrix and the second target; then, - combining (319) the first and second filters to obtain the global filter. [Claim 5] MIMO control method according to claim 1, wherein defining a first filter optimization strategy on the first frequency band and a second filter optimization strategy on the second frequency band consists of defining a first target Qd)) for a particular frequency of the first frequency band and a second target (jf2)) for a particular frequency of the second band, and determining (455) a global target (d) varying continuously with the frequency by interpolation of the first and second targets,then to determine (417) by optimization the global filter (8) from the response matrix (H) and the global target. [Claim 6] Control method according to any one of claims 2 to 5, in which the first target at a point P of positioning of a microphone is synthesized: - in a first form: yp where A) is the amplitude of the acoustic field and is a reference time, of emission of the test signal; - in a second form: / 1) y5 », w where hp is the dp = L^dp,^, v p' response of the s-th loudspeaker measured at a single reference point, Pref; - in a third form: / 1) _ 1 v (y5 \, where Pc is a dp — subset of the measurement points comprising Nc points, and hps is the response of the s-th loudspeaker measured at point P; or, - in a fourth form: jG) _ .[Claim 7] Control method according to any one of claims 2 to 6, in which the second target at a positioning point P of a microphone is synthesized: - in a first form: where 5 is the Dirac function, Ap is the Fonde amplitude at the measurement point P, and tp is the delay which depends on the measurement position relative to the or each loudspeaker emitting the test signal; - in a second form: ^2) _ hps( t) T(t)' °ù es a time window applied to the measured responses hpi( t), and SE is the subset of loudspeakers which are involved in the creation of the target, - in a third form: j(2) _ . ; or, ap - / Iq - in a fourth form: / 2) _ â ô( t-tP), where 1 ps is the distance dp ~ Æ0 rIM between the loudspeaker of index 5 and the measurement point P.[Claim 8] Control method according to any one of the preceding claims, wherein the part (20) defining a cut-off frequency between a pressurization regime and a propagation regime, the first frequency band is defined below the cut-off frequency, and the second band is defined above the cut-off frequency. [Claim 9] Control system (11) characterized in that the control system is adapted to implement, when associated with a sound reproduction system, a MIMO control method according to any one of the preceding claims for controlling. [Claim 10] Control system according to claim 9, wherein the control system comprises a first computer and a plurality of mi-.

Claims

microphones and the sound reproduction system comprises a second computer and a plurality of loudspeakers, the first and second computers being the same computer suitably programmed or two separate computers but connected for the implementation of the MIMO control method.

11. Computer program (36) comprising software instructions which, when executed by the computer of a control system according to claim 9 or claim 10 associated with a sound reproduction system, implement a MIMO control method according to any one of the preceding claims. [Fig. 1] [Fig. 2] [Fig. 3] [Fig. 4] (451) (453) (455) 416 (415) [Fig. 5] [Fig. 6] (m

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