Operating Manual for Digital Sound Processor (DSP) V3.0
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G
roup Setting: Open the group setting interface swiftly.
Minimum and Maximum Gains: Limit the maximum and minimum of the gain of a channel. After it
is commissioned, if you do not wish that the system's stability is affected due to external factors, you
may set up a maximum gain.
3.4.2 Expander
The expander has a totally different principle from the compressor. It can expand the dynamic range
of a signal. The most fundamental difference in these two devices lies in that, the compressor works
on the signal higher than the threshold, while the expander works on the signal lower than the
threshold. The expander can turn small signal into smaller one. It can be seen from Fig.3.2 that, when
the expansion ratio reaches 1:2, the input signal 20dB lower than the threshold will generate an
output signal 40dB lower than the threshold. Thus, as shown below, the signal lower than the
threshold will extend downwards and cause smaller level. When an expansion ratio 1:20 is adopted.
The expander seems to be a noise gate in terms of the transmission features. In fact, a noise gate is
an expander with great expansion ratio.
F
ig.3.2 Expander
The expander has the following control parameters:
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