THREE DIMENSIONAL SOUND CONTROL WITH ACTIVE NOISE CANCELLATION

摘要

A three dimension localized quiet zone (3) suitable for a workplace (1) of an operator. An active noise cancelling signal is projected into the zone (3) where monitoring microphones (6, 7) are present. Input sound is acoustically sensed at the sources of a plurality of sound sources and normalized. The active noise cancellation is adjusted through an adaptive Filtered X Algorithm with modification for multiple monitoring microphones (6, 7) and multiple speakers (4, 5).