Re: Getting around automatic gain control -- Eyecon Video Productions

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Subject: Re: Getting around automatic gain control

Author:
Bob Bennett

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Date Posted: 07:21:12 11/15/01 Thu
In reply to: Ian Lewis 's message, "Getting around automatic gain control" on 18:35:53 10/14/01 Sun

>I have a Panasonic "Prosumer" AG-456U camcorder. It
>has a mic input with Automatic Gain Control. My
>problem is when I attach a mic to it and there is not
>any speaking or a pause in the action it blows out the
>audio and any minimal background noise is really
>amplified. Is there anyway around the auto gain?
>
>Thanks for the input,
>
>Ian

You can get around the auto-gain control by mixing an inaudible signal (under 10Hz or over 18KHz) with the camera's input. The circuitry will clamp down the signal, leveling it at the inaudible frequency's volume. Using a mixer, the volume control for the channel of the "ghost" signal actually acts as a reverse volume control -- push it up and the auto-gain will lower the volume ... bring it down and the auto-gain will raise the volume.

I hope this helps...

bob

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