ACTIVE NOISE CONTROL SYSTEM USING PHASED-ARRAY SENSORS

摘要

An active noise control system is provided with a plurality of error sensor arrays (50, 77) which provide signals on lines (64-74, 90-100) to beam forming and beam steering logic (76) which cause the arrays (50, 77) to exhibit acoustic response profiles (104, 106), respectively. The profiles (104, 106) intersect in a predefined region (116) to be quieted. The logic (76) provides signals on lines (118), one for each region to be quieted, to active noise control (ANC) logic (20) which also receives inputs from feedforward sensing microphones (10) and provides output signals to acoustic speakers (24) which generate anti-noise (26) to cancel the noise in the quiet region (116). The quiet region (116) may be selectively positioned to any region in the room by steering the beams (104, 108). Alternatively, the system may have a plurality of distributed sensors which, when taken together, have an overall maximum (main lobe) acoustic response at a predetermined selectable quiet region.