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1. WO2020223094 - ENDPOINT DEVICE USING THE PRECEDENCE EFFECT TO IMPROVE ECHO CANCELLATION PERFORMANCE

Publication Number WO/2020/223094
Publication Date 05.11.2020
International Application No. PCT/US2020/029458
International Filing Date 23.04.2020
IPC
H04R 3/02 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
3Circuits for transducers
02for preventing acoustic reaction
H04R 3/12 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
3Circuits for transducers
12for distributing signals to two or more loudspeakers
H04R 5/04 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
5Stereophonic arrangements
04Circuit arrangements
H04M 9/08 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
9Arrangements for interconnection not involving centralised switching
08Two-way loud-speaking telephone systems with means for conditioning the signal, e.g.  for suppressing echoes for one or both directions of traffic
H04R 3/00 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
3Circuits for transducers
H04R 5/02 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
5Stereophonic arrangements
02Spatial or constructional arrangements of loudspeakers
CPC
H04M 9/08
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
9Interconnection arrangements not involving centralised switching
08Two-way loud-speaking telephone systems with means for suppressing echoes or otherwise conditioning for one or other direction of traffic
H04R 1/406
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
1Details of transducers, ; loudspeakers or microphones
20Arrangements for obtaining desired frequency or directional characteristics
32for obtaining desired directional characteristic only
40by combining a number of identical transducers
406microphones
H04R 2430/01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
2430Signal processing covered by H04R, not provided for in its groups
01Aspects of volume control, not necessarily automatic, in sound systems
H04R 2430/23
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
2430Signal processing covered by H04R, not provided for in its groups
20Processing of the output signals of the acoustic transducers of an array for obtaining a desired directivity characteristic
23Direction finding using a sum-delay beam-former
H04R 3/005
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
3Circuits for transducers ; , loudspeakers or microphones
005for combining the signals of two or more microphones
H04R 3/02
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
3Circuits for transducers ; , loudspeakers or microphones
02for preventing acoustic reaction ; , i.e. acoustic oscillatory feedback
Applicants
  • CISCO TECHNOLOGY, INC. [US]/[US]
Inventors
  • BURENIUS, Lennart
Agents
  • FLOAM, D., Andrew
  • ALDAG, Andrew, J.
  • CROSLAND, David, W.
  • DEBOY, Mark
  • EDELL, Ira, C.
Priority Data
16/398,80930.04.2019US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) ENDPOINT DEVICE USING THE PRECEDENCE EFFECT TO IMPROVE ECHO CANCELLATION PERFORMANCE
(FR) DISPOSITIF DE POINT D'EXTRÉMITÉ UTILISANT L'EFFET DE PRÉCÉDENCE POUR AMÉLIORER LES PERFORMANCES D'ANNULATION D'ÉCHO
Abstract
(EN)
An endpoint device includes a microphone array and spaced-apart loudspeakers including an active loudspeaker among the loudspeakers that is closest to the microphone array. The endpoint device forms at the microphone array an audio receive beam having a main lobe pointed in a direction from which audio is to be received, and determines which of the loudspeakers are not in the main lobe. The endpoint device identifies at least one additional loudspeaker among the loudspeakers determined not to be in the main lobe and that is farther away from the microphone array than the active loudspeaker. The endpoint device spreads audio energy of input audio associated with, and intended for, the active loudspeaker across the active loudspeaker and the at least one additional loudspeaker, and no other ones of the loudspeakers, using a precedence effect.
(FR)
La présente invention concerne un dispositif de point d'extrémité comprenant un réseau de microphones et des haut-parleurs espacés comprenant un haut-parleur actif parmi les haut-parleurs qui est le plus proche du réseau de microphones. Le dispositif de point d'extrémité forme au niveau du réseau de microphones un faisceau de réception audio ayant un lobe principal pointé dans une direction à partir de laquelle un élément audio doit être reçu et détermine lequel des haut-parleurs ne sont pas dans le lobe principal. Le dispositif de point d'extrémité identifie au moins un haut-parleur supplémentaire parmi les haut-parleurs déterminés comme n'étant pas dans le lobe principal et qui est plus éloigné du réseau de microphones que le haut-parleur actif. Le dispositif de point d'extrémité étale l'énergie audio d'un élément audio d'entrée associé au, et destiné au, haut-parleur actif à travers le haut-parleur actif et le ou les haut-parleurs supplémentaires et aucun autre haut-parleur des haut-parleurs, à l'aide d'un effet de précédence.
Latest bibliographic data on file with the International Bureau