Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Within cabin or compartment of vehicle
Reexamination Certificate
2005-05-10
2005-05-10
Isen, Forester W. (Department: 2644)
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Within cabin or compartment of vehicle
C381S086000, C381S056000, C381S057000
Reexamination Certificate
active
06891954
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.
REFERENCES:
patent: 5371802 (1994-12-01), McDonald et al.
patent: 5469510 (1995-11-01), Blind et al.
patent: 6675232 (2004-01-01), Sato et al.
patent: 05-011779 (1993-01-01), None
Hashimoto Hiroyuki
Inoue Toshio
Kakuhari Isao
Nakamura Yoshio
Sano Hisashi
Grier Laura A.
Isen Forester W.
Matsushita Denkisangyo Kabushiki Kaisha
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