Superdirective microphone arrays

H - Electricity – 04 – R

Patent

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Details

H04R 1/40 (2006.01) H04R 3/00 (2006.01)

Patent

CA 2256485

An end fire microphone array having reduced analog-to-digital converter requirements is disclosed. Analog filters (112, 113, 114) are used to band-limit at least two secondary microphone elements (102, 103, 104) which are spaced from a primary microphone element (101) a distance respective of their band limited outputs. The band-limited secondary microphone signals are digitized by an analog-to-digital converter (120). A signal processor (130) performs a superdirective analysis of the primary microphone (101) signal and the combined secondary microphone signals (115). A steerable superdirective microphone array is also disclosed in which a plurality of microphones are arranged in a ring. Their outputs are digitized, split into frequency bands, and weighted sums are formed for each of a plurality of directions. A steering control circuit evaluates the relative energy of each directional signal in each band and selects a microphone direction for further processing and output.

L'invention porte sur un réseau de microphones à rayonnement longitudinal présentant des exigences réduites en matière de conversion A/N. Des filtres analogiques (112, 113, 114) servant à limiter la bande d'au moins deux microphones secondaires (102, 103, 104) lesquels sont séparés d'un microphone primaire (101) pas une distance correspondant à leurs signaux de sortie limités en bande. Les signaux des microphones secondaires limités en bande sont numérisés par un convertisseur A/N (120). Un processeur de signaux (130) effectue une analyse superdirective du signal du microphone primaire (101) et des signaux (115) des microphones secondaires combinés. L'invention porte également sur un réseau de microphones superdirectifs de plusieurs microphones disposés en cercle. Leurs signaux de sortie sont numérisés, découpés en bandes de fréquences, et des totaux pondérés sont établis pour chacune des directions d'un ensemble. Un circuit de commande d'orientation évalue l'énergie relative de chacun des signaux directionnels dans chacune des bandes, et sélectionne une direction de microphone en vue d'un traitement ultérieur et d'une émission.

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