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AGC Disable
For cameras which do not have any manual override of their AGC (Automatic
Gain Control), the DT454 offers 2 methods to defeat the AGC.
Signal-to-noise is improved when noisy camera amplifiers are throttled back, and
the noisy camera gain is replaced by clean gain in the juicedLink low-noise
preamplifiers. This is easily accomplished with cameras having manual control of
audio gain (see the “Low Noise Performance” section).
However, some cameras do not have manual control. The DT454 AGC Disable
feature forces the camera’s AGC to throttle back its noisy gain by sending a signal
(either NOISE or TONE) into the camera’s right channel (as illustrated by the
Block Diagram), to improve signal-to-noise performance. The camera senses the
presence of a strong signal in the right track, and the camera’s AGC function then
throttles back its noisy gain.