Operating Manual for Digital Sound Processor (DSP) V3.0
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Auto gain control includes the following control parameters and switches:
Threshold: When the signal level is lower than the threshold, the input-to-output ratio is 1:1.
When the signal level is higher than the threshold, the input-to-output ratio changes with the
ratio control settings. The threshold is set as the background noise just higher than the level of
input signal.
Ratio: It refers to the ratio of the changes in the level of the input signal higher than the threshold to
the changes in the level of the output signal.
Target Threshold: It refers to the level of output signal required. If the signal is higher than the
threshold, the controller will compress the signal in proportion.
Starting Time: It refers to the response time required to control the level higher than the threshold.
Release Time: It refers to the response time required to control the level lower than the threshold.
3.4.5 Equalizers
The equalizer is mainly used to correct the frequency range that is overemphasized or gets lost, no
matter it is wide or narrow. In addition, the equalizer can also help us to narrow or widen the
frequency range, or change the amount of a component in the frequency spectrum. To get it
simplified, the equalizer can be used to change the tone of the signal.
The equalizer has the following control parameters:
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