Electrical audio signal processing systems and devices – Monitoring of sound – Amplification control responsive to ambient sound
Patent
1990-08-27
1991-12-31
Isen, Forester W.
Electrical audio signal processing systems and devices
Monitoring of sound
Amplification control responsive to ambient sound
387107, H03G 320
Patent
active
050777998
ABSTRACT:
An electronic circuit for automatically adjusting the volume of an audio program in accordance with changes in the magnitude of ambient noise is disclosed. A voltage signal is generated which is proportional to the magnitude of the ambient noise. The voltage signal is applied to the cathode of a diode. The anode of the diode is connected through a capacitor to ground potential. The anode of the diode is also connected to a variable resistance device, which controls the volume of the audio program in accordance with the voltage across the capacitor. When the magnitude of the ambient noise increases, the capacitor is slowly charged by the leakage current passing through the reversed biased diode. As a result, the volume of the audio program is slowly increased. When the magnitude of such noise decreases, the capacitor is rapidly discharged through the forward biased diode. Thus, the volume of the audio program is rapidly decreased.
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