Patent Document ID: 9613613
Application ID: 14767211
Patent Flag: 1

Claim One:
1. An active acoustic control method for attenuating in frequency one/several narrow-band disturbing noises in a configuration of a space, said space including: at least one source of narrow-band disturbing noise, at least one counter-noise loudspeaker intended to produce a counter-noise in said space as a function of a loudspeaker control signal U(k), and at least one error microphone intended to measure the sounds in said space and producing a measurement signal Y(k), the attenuation occurring essentially in the vicinity of the error microphone(s), said space with its loudspeaker(s) and its microphone(s) forming a physical electroacoustic system, said method including a calculation in real time, in a calculator, of the control signal U(k) as a function of the measurement signal according to a control law with internal model and disturbance observer, said control law implementing a model of the electroacoustic system, wherein said model of the electroacoustic system has been previously obtained by a model identification method, wherein the current configuration of the physical electroacoustic system is varied over time, which leads to a modification of the current model {tilde over (M)}(q −1 ) or {tilde over (M)}(k) of the physical electroacoustic system with respect to the previously identified model, a nominal configuration of said physical electroacoustic system is previously determined and a so-called nominal model M o (q −1 ) or M o (k) corresponding to said nominal configuration of said physical electroacoustic system is previously identified, and the internal-model and disturbance-observer control law in which a modifier block Δ(q −1 ) or Δ(k) is associated with the nominal model is implemented in real time, said modifier block being interconnected/applying to said nominal mode, and the nominal model is left unchanged during the variations of the current configuration of the physical electroacoustic system and the modifier block is varied in real time during the variations of the current configuration of the physical electroacoustic system so as to adapt in real time the internal-model control law to the current configuration of the physical electroacoustic system, the current model {tilde over (M)}(q −1 ) or {tilde over (M)}(k) of the current configuration of the physical electroacoustic system being considered as being equal to the nominal model M o (q −1 ) or M o (k) interconnected to the modifier block Δ(q −1 ) or Δ(k).