Circuit arrangement for adjusting the volume of an automobile ra

Amplifiers – Hum or noise or distortion bucking introduced into signal...

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Details

325406, 330141, 330281, H03F 126

Patent

active

041796675

ABSTRACT:
The invention relates to a circuit arrangement for adjusting the volume of an automobile radio receiver in dependence on road noise, comprising a microphone which picks up the noise and emits an electric signal which is conducted by way of an amplifier, a rectifier and a time-controlled circuit, to a control-adjustment member contained in the low frequency channel of the receiver.

REFERENCES:
patent: 2409058 (1946-10-01), Mitchell
patent: 2501327 (1950-03-01), Good
patent: 3021489 (1962-02-01), Nielsen

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