The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 2005
Filed:
Mar. 29, 2001
Akira Takahashi, Tochigi-ken, JP;
Toshio Inoue, Tochigi-ken, JP;
Tsuyoshi Yamashita, Tochigi-ken, JP;
Hisashi Sano, Tochigi-ken, JP;
Kenichi Terai, Osaka-fu, JP;
Hiroyuki Hashimoto, Osaka-fu, JP;
Isao Kakuhari, Nara-ken, JP;
Yoshio Nakamura, Osaka-fu, JP;
Akira Takahashi, Tochigi-ken, JP;
Toshio Inoue, Tochigi-ken, JP;
Tsuyoshi Yamashita, Tochigi-ken, JP;
Hisashi Sano, Tochigi-ken, JP;
Kenichi Terai, Osaka-fu, JP;
Hiroyuki Hashimoto, Osaka-fu, JP;
Isao Kakuhari, Nara-ken, JP;
Yoshio Nakamura, Osaka-fu, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Matsushita Denkisangyo Kabushiki Kaisha, Osaka, JP;
Abstract
In an active noise control apparatus in which an audio signal and a noise control signal are mixed to thereby sound a loudspeaker inside a motor vehicle, a general-purpose audio head unit cannot conventionally be freely changed for the one already mounted on the motor vehicle. As a solution, an active noise control unit is provided with a buffer amplifier and a mixer. An audio signal amplified by a power amplifier in an audio head unit is adjusted in level by the buffer amplifier such that a level of an audio signal outputted after amplification by the first amplifier becomes substantially equal to a level of the audio signal outputted from the audio head unit. Then, at the mixer, a noise control signal outputted from an active noise controller is added to an audio signal outputted from the buffer amplifier. Therefore, any audio head unit can be freely changed for the one already mounted on the vehicle as long as the audio head unit contains therein a power amplifier.