Acoustic-device cooling unit

Details Acoustic-device cooling unit Acoustic-device cooling unit

1988-09-02

1989-08-22

Isen, Forester W.

Electrical audio signal processing systems and devices

Audio transducer protection circuitry

381 59, H03G 1100

Patent

active

048603619

ABSTRACT:
A cooling unit for cooling an acoustic device installed on the vehicle by using a cooling fan comprises a cooling fan drive circuit which outputs a DC voltage proportional to the input or output signal level of the acoustic device to control the speed of rotation of the cooling fan motor, whereby the noise of the cooling fan is suppressed in a sense of hearing when no signal is provided by the acoustic device.

REFERENCES:
patent: 3195034 (1965-07-01), Bensema
patent: 4267500 (1981-05-01), Bourke et al.

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