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1. (WO1997018550) METHOD AND DEVICE FOR RECOVERING A WANTED ACOUSTIC SIGNAL FROM A COMPOSITE ACOUSTIC SIGNAL INCLUDING INTERFERENCE COMPONENTS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/018550 International Application No.: PCT/FR1996/001781
Publication Date: 22.05.1997 International Filing Date: 12.11.1996
Chapter 2 Demand Filed: 03.05.1997
IPC:
G01V 1/28 (2006.01) ,G10K 11/178 (2006.01)
G PHYSICS
01
MEASURING; TESTING
V
GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
1
Seismology; Seismic or acoustic prospecting or detecting
28
Processing seismic data, e.g. analysis, for interpretation, for correction
G PHYSICS
10
MUSICAL INSTRUMENTS; ACOUSTICS
K
SOUND-PRODUCING DEVICES;  METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
11
Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16
Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
175
using interference effects; Masking sound
178
by electro-acoustically regenerating the original acoustic waves in anti-phase
Applicants:
TECHNOFIRST [FR/FR]; 399, avenue des Templiers F-13400 Aubagne, FR (AllExceptUS)
CARME, Christian [FR/FR]; FR (UsOnly)
ROURE, Alain [FR/FR]; FR (UsOnly)
Inventors:
CARME, Christian; FR
ROURE, Alain; FR
Agent:
NICOLLE, Olivier; Cabinet Netter 40, rue Vignon F-75009 Paris, FR
Priority Data:
95/1340713.11.1995FR
Title (EN) METHOD AND DEVICE FOR RECOVERING A WANTED ACOUSTIC SIGNAL FROM A COMPOSITE ACOUSTIC SIGNAL INCLUDING INTERFERENCE COMPONENTS
(FR) PROCEDE ET DISPOSITIF D'EXTRACTION D'UN SIGNAL ACOUSTIQUE UTILE A PARTIR D'UN SIGNAL ACOUSTIQUE COMPOSITE COMPRENANT DES COMPOSANTES PARASITES
Abstract:
(EN) A device for recovering a wanted acoustic signal (Un) from a composite acoustic signal (Mn) including interference components. The device comprises first sensor means (2) for sensing the composite acoustic signal (Mn), second sensor means (16) for sensing, in real time, an acoustic reference signal (Rn) substantially correlated with the interference components (Pn) of the composite acoustic signal (Mn), adaptive filter means (12), and recovery means (6). The coefficients of the filter means (12) are adapted in real time according to an algorithm selected so that the energy of the composite acoustic signal (Mn) is minimised according to the energy of the acoustic reference signal (Rn), until the signal (Sn) from the output (10) of the recovery means (6) substantially corresponds to the wanted acoustic signal (Un) from which the interfering components (Pn) have been selectively removed.
(FR) Le dispositif d'extraction d'un signal acoustique utile (Un) à partir d'un signal acoustique composite (Mn) comprenant des composantes parasites comprend: des premiers moyens capteurs (2) du signal acoustique composite (Mn), des seconds moyens capteurs (16), en temps réel, du signal acoustique de référence (Rn), sensiblement corrélé avec les composantes parasites (Pn) du signal acoustique composite (Mn), des moyens de filtrage adaptatif (12), et des moyens d'extraction (6). Les coefficients des moyens de filtrage (12) sont adaptés en temps réel selon un algorithme choisi pour minimiser l'énergie du signal acoustique composite (Mn) en fonction de l'énergie du signal acoustique de référence (Rn), jusqu'à ce que le signal (Sn) issu de la sortie (10) des moyens d'extraction (6) corresponde sensiblement au signal acoustique utile (Un) dépourvu sélectivement des composantes parasites (Pn).
Designated States: AU, CA, JP, NO, US
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: French (FR)
Filing Language: French (FR)
Also published as:
EP0861486US5943641AU1996075769