Automatic gain control

Details Automatic gain control Automatic gain control

2002-09-24

2008-10-07

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Including amplitude or volume control

Automatic

Reexamination Certificate

active

07433476

ABSTRACT:
In an automatic gain control unit, the gain of a voltage-controlled amplifier (VCA) (25) is regulated with a closed-loop control circuit. The time constant of the control circuit is varied dependent on the magnitude (31) of the VCA output signal. As long as the magnitude (31) of the VCA output signal is small, the gain is slowly adjusted. In case the magnitude (31) of the VCA becomes so large that saturation of the analog-digital converter (28) might occur, the time constant of the control circuit is decreased, in order to allow for a quick adjustment of the amplifier's gain.

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K. Mclaning et al., “Radio Receiver Design”, Noble Publishing Corporation, Atlanta, 2000, pp. 691-695.

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