Limiter - Datavideo AD-300 Instruction Manual

Ratio determines how much gain reduction the expander applies when the audio
signal falls below the threshold level. For example, a ratio of 4:1 means that if the
input signal falls below the threshold by 1 dB, the output signal from the expander will
be 4 dB lower than the threshold.
The available ratios on AD-300 are listed as follows:

1:1

1.6:1

2:1

4:1

8:1

16:1

32:1

64:1

100:1
The attack time (50 – 500 msec) sets how quickly the expander starts to reduce the
gain after the audio level drops below the threshold.
The decay time or release time (300 – 2000 msec) sets how quickly the expander
stops having an effect after the level crosses above the threshold.

Limiter

A limiter limits the audio signal to a certain threshold. While a compressor smoothly
reduces the gain above the threshold, a limiter completely prevents any additional
gain above the threshold. The graph below shows a limiting ratio of infinity to one.
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