I/O CALIBRATION AND SYSTEM SETUP
ENG
Page 49
The Phase Rotator stage performs 1 msec Group Delay at low frequencies in respect of medium
frequencies. This results in a phase rotation centered on 600 Hz frequency.
19.5 AGC SPEED
One of the most important processor function is the Automatic Gain Control (AGC) system, which
compensates for variations in the input level to keep the signal at 0 dB.
The following parameters regulate the AGC function and may be modified:
0
AGC Speed: sets the signal compensation speed
1
AGC Mode: sets the maximum amplification level (MaxG), correction pause time (Hold) and
the freeze threshold (GATE)
DEFAULT SCREEN
INPUT CALIBRATION menu
AGC Speed
The AGC speed value is expressed in dB/sec - i.e. the number of dB amplified or attenuated in one second.
The AGC operates at its full speed value only when the input signal level is less than - 3dB and greater than
3 dB compared to the internal 0 dB reference level. Within this interval, the AGC speed is reduced to one
quarter of the set value, as high compression and high amplification speed on the whole band can engender
unpleasant pumping effects.
For example, with AGC speed = + 5 dB, an input signal of - 15 dBm will be amplified to - 5 dBm in exactly
two seconds (the approach to the 0 threshold is slower, as explained).
High AGC Speed values obviously make it possible to quickly recover strong level differences, but they can
also lead to unpleasant ‘pumping’ effects.
We suggest using medium speed levels of around 2 to 3 dB, and especially that you concentrate on the
audio sources connected to the processor, to obtain the most even sound possible.
AGC Speed acts on both the digital and analog inputs and sets the compensation speed of the input
channel signal level variation.
Summary of Contents for Falcon 35
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