Patent ID: 7254240

Claim:
An active noise control system comprising: a reference signal microphone for generating a reference signal highly correlated to noise sound from a noise source in a passenger compartment of the vehicle; feed-forward control means for being supplied with the reference signal highly correlated to noise sound from the noise source and generating a noise cancellation signal which is out of phase to the noise sound in the passenger compartment of a vehicle; canceling sound generating means disposed in the passenger compartment for generating a noise canceling sound in response to the noise cancellation signal from said feed-forward control means; and a confirmation microphone for confirming cancellation of the noise sound in the passenger compartment and for generating a feed-back output signal; said feed-forward control means comprising means for lowering the level of the feed-back output signal from said confirmation microphone with the noise cancellation signal; said confirmation microphone being positioned substantially centrally between laterally spaced roof rails of the vehicle in a width direction of the vehicle in the passenger compartment, wherein said noise control system is used in the passenger compartment of the vehicle with a fixed roof or with a sunroof closed.