Operating Manual for Digital Sound Processor (DSP) V3.0
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Threshold: The expander can be started only when the signal exceeds this threshold (allowing the
transmission of the signal). As a matter of fact, the signal is often set as the ambient noise.
Ratio: It refers to the slope below the threshold point on the gain curve. When the slope is set at a
high level, the gate movement will start.
Starting time: It refers to the time required to start the expander when the duration of the input
signal exceeds the threshold. Shorter starting time allows us to start the expander more quickly.
Release time: It refers to the time required for the gain to be restored to a value lower than the
threshold when the input signal is lower than the threshold.
No matter the starting time or the release time, it just helps to reduce the changing speed of gain
attenuation. That is to say, the speed of the gain from -40dB to 0dB is slowed down due to the
influence of starting time. The starting time or release time is unrelated to the threshold. If the signal
changes below the threshold, the starting time and the release time will have their own respective
influence on gain attenuation; when the signal level rises above the threshold, the gain attenuation
produced by the expander will disappear in accordance with the speed controlled by the starting
time. When the gain attenuation is reduced to 0dB, the expander will stop expansion. Later, when the
signal reduces to below the threshold, the expander will start again and the release time will begin
to work.
3.4.3 Compressor & Limiter
Compressor
The compressor is used to reduce the dynamic range of the signal higher than the threshold set by
the users, and to maintain the dynamic range of the signal lower than the threshold. The compressor
has the following control parameters:
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