A device for the active reduction in noise level of a periodically operating noise source

摘要

Microphones (1, 2), for detecting noise in a device for the active reduction in noise level at the head of a motor vehicle occupant are disposed at locations in the motor vehicle remote from the head. Controllable amplifiers (3, 4, 8, 11) are connected downstream of the microphones (1, 2) to assess the signals emitted from the microphones (1, 2) to the computer (9) in such a way that a plurality of microphones (1, 2) respectively define a virtual microphone location at the head of the motor vehicle occupant. IMAGE