MFJ hamProAudio MFJ-654, Инструкция по эксплуатации

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J-654 hamProAudio
TM
Microphone Equalizer/Conditioner Instruction & Technical Manual
-18-
THEORY OF OPERATION
The SSM2166 is a complete microphone signal condition system on a single IC.
It provides amplification, RMS detection, limiting, variable Compression and
Downward Expansion.
Figure 13: Functional Diagram
Figure 13 shows the functional diagram of the SSM2166. Input signals below
Vde set by The Downward Expansion control on the front panel are downward
expanded, that is a -1dB change in the input signal level causes a -3dB change
in the output level. The average time for this feature is set by the Delay control
on the front panel. Overall gain of the MFJ-654 is set by controlling the Vca
through the front panel control. Gains of up to 20 dB are available. Compression
is set by the front panel control and ratios of 1:1 up to 15:1 are possible.