Patent ID: 6891954
Filing Date: 2005-05-10
Classification: G10K,H04B

Abstract:
1. A vehicle-mounted noise control apparatus comprising an active noise control unit for generating a noise control signal which reduces noises from outside and for outputting the noise control signal after amplification by a first power amplifier; and a replaceable audio head unit for outputting an audio signal from an audio system after amplification by a second power amplifier, wherein said active noise control unit further comprises: a buffer amplifier for adjusting a gain of the audio signal, when an amplified audio signal outputted from said audio head unit is inputted into said active noise control unit, such that a level of an audio signal outputted after amplification by said first amplifier becomes substantially equal to a level of the audio signal outputted from said audio head unit; and a mixing means for adding the noise control signal before amplification to a gain-adjusted audio signal outputted from said buffer amplifier for further outputting to said first amplifier, wherein said first power amplifier, said buffer amplifier, and said mixing means are disposed within said active noise control unit.