US 12,230,240 B2
Method and device for controlling the propagation of acoustic waves on a wall
Morvan Ouisse, Besançon (FR); Manuel Collet, Tassin (FR); and Gaël Matten, Besançon (FR)
Assigned to CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR); ECOLE NATIONALE SUPERIEURE DE MECANIQUE ET DES MICROTECHNIQUES (ENSMM), Besançon (FR); and UNIVERSITE DE FRANCHE-COMTE, Besançon (FR)
Appl. No. 17/757,057
Filed by CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR); ECOLE NATIONALE SUPERIEURE DE MECANIQUE ET DES MICROTECHNIQUES (ENSMM), Besançon (FR); and UNIVERSITE DE FRANCHE-COMTE, Besançon (FR)
PCT Filed Dec. 11, 2020, PCT No. PCT/EP2020/085832
§ 371(c)(1), (2) Date Jun. 8, 2022,
PCT Pub. No. WO2021/122394, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 1914484 (FR), filed on Dec. 16, 2019.
Prior Publication US 2023/0026230 A1, Jan. 26, 2023
Int. Cl. G10K 11/175 (2006.01); G10K 11/02 (2006.01); H04R 1/40 (2006.01); H04R 3/00 (2006.01); H04R 3/12 (2006.01); H04R 29/00 (2006.01)
CPC G10K 11/02 (2013.01) [H04R 1/403 (2013.01); H04R 1/406 (2013.01); H04R 3/002 (2013.01); H04R 3/005 (2013.01); H04R 3/12 (2013.01); H04R 29/002 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for controlling the propagation of acoustic waves in the vicinity of a wall, the method comprising:
a step a) in which a number Nc of cells, Nc>1, is affixed on the wall, each cell including a set of Nm microphones, a control unit, a power supply, and a speaker linked to said set of Nm microphones, said set of Nm microphones and speaker for each said cell being driven by said control unit, a power supply;
a step b) in which each said Nm microphone of each cell measures the acoustic pressure of the acoustic waves, each measurement being returned to the cell control unit;
a step c) in which the control unit estimates the acoustic pressure and/or its tangential spatial derivatives at the speaker, then applies a control law that sets the amperage of an electrical signal that must be sent to the speaker so as to obtain a determined generalized acoustic impedance Zdet for the speaker; and
a step d) in which the control unit sends the electrical signal to the speaker, so that a fraction of the acoustic waves is absorbed by a membrane of the speaker, a main control device (C) driving each said control unit in each said cell, using a learning loop so as to adjust the determined generalized acoustic impedance Zdet for each cell, said loop including the following steps:
BEGIN: start
A1: loading a generic acoustic model
A2: assigning a control law to at least one of the cells
A3: calculating parameters associated with the control law
A4: applying the control law of step A2 to each said cell
A5: generating a reference signal
A6: acquiring the reference signal by the microphones
A7: calculating an insertion loss denoted IL
A8: comparing the calculated insertion loss denoted IL with a predetermined insertion loss value IL0 corresponding to obtaining a determined generalized acoustic impedance Zdet
A9: return to A3 for adaptation of the parameters of the control law in order to minimize an error on a measured impedance, in the event that IL is less than IL0, otherwise, the loop finishes with END.