USER
MANUAL
MPD-1611291-A
EXACT-V2 High End Rack Modulator / Exciter
3/10/2017
MPD-1611291-A
Page 24/94
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CONTINUOUS DAP: The DAP works continuously until the user exits continuous
mode.
Figure 9: Continuous DAP mode operation
2.6.1.2
Linear Adaptive Precorrection
The purpose of Linear precorrection is to correct the distortion in amplitude and in
group delay of the output filter. The precorrector is based on a complex FIR filter which
can correct up to 3dB (range -3dB to 3dB) in amplitude and up to 3µs (range 0 to 3µs)
in group delay.
With the feedback after the output filter, an adaptive linear precorrection should
automatically find the correct precorrection curve in a few minutes.
Two operating modes are possible:
•
STATIC (MANUAL EDIT) mode: The DAP is disabled. The user can load a
previous DAP configuration to be applied to the modulator or can edit the
precorrection curves manually.
•
SINGLE mode: The user starts the adaptive precorrection manually. The
adaptive precorrection process is stopped if the timeout value has been reached
or if the user stops the process manually.
