Operating Manual for Digital Sound Processor (DSP) V3.0
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T
he limiter only has one key task: make sure that the signal will not exceed the threshold level in any
case. By adjusting the compressor's control parameters, its working modes will be very similar to
those of the limiter. The core working principle of a limiter is that it really focuses on the signal below
the threshold level as well as how the gain attenuation is produced before the occurrence of
overshoot signal. The limit period consists of two processing stages: during the first stage, there is a
minor limit, but the overshoot signal will not be processed; during the second stage, if there is
overshoot signal, it will attenuate in a very fierce way.
The limiter only provides two parameters: Threshold and Release Time. In terms of signal processing,
occasional clipping will be solved via limiter, while the signal level shall be attenuated in terms of
frequent clipping.
3.4.4 Auto Gain Control
Auto gain control (AGC) is an exception of compressor. Its threshold is set at a very low level with
middle-to-slow starting time, long release time and low ratio. The purpose is to improve the signal
with uncertain level to a target level, while maintaining the dynamic range at the same time. Most of
the auto gain control includes silent detection to prevent the gain attenuation loss during the silent
period. This is the only function that distinguishes auto gain control from ordinary compressor/limiter.
Auto gain control may be adopted to normalize the level of CD players that play background
music, frontground music and music on hold, so as to eliminate the changes in the level of some
paging microphones.
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