Setting Up The Srp-X500P Using Manager Software; Automatic Gain Control (Agc) - Sony SRP-X500P System Integration Manual

Audio/video matrix mixer
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SRP-X500P System Integration Guide
5
Setting up the SRP-X500P Using
Manager Software

5-1. Automatic Gain Control (AGC)

It is often difficult to appropriately adjust microphone
volumes when picking up voice. This is because speaking
volumes differ from person to person, and depend on the
distance between each presenter's mouth and the
microphone. The Automatic Gain Control (AGC) function
is convenient for maintaining an optimum audio level by
reducing speech volume differences. AGC can be set using
the supplied SRP-X500P Manager software. For more
details on AGC, refer to the appendix.
AUTO GAIN CONTROL Setting Screen
I Setting
1. Set the overall audio volume. The speaker output
level should be adjusted beforehand so that the audio
can be heard evenly anywhere in the room.
2. Set the AGC to ON. Left click the AGC button on the
OVERVIEW screen to display the AUTO GAIN
CONTROL setting screen. Click the ON button to turn
on the AGC function.
3. Initially set the GATE THRESHOLD level to -50 dB.
4. Adjust the COMPRESSOR THRESHOLD level so that
the GAIN CONTROL meter reads between -5 and
-10 dB when talking on a microphone in a loud voice.
At the same time, adjust the RATIO so that the voice
can be clearly heard. As a rough guideline, set it
between 3:1 and 10:1.
5. Adjust the MAKE GAIN
so that the compressor
characteristics line is at
0 dB IN/0 dB OUT.
14
6. Adjust the GATE THRESHOLD level so that the gate
does not open with the ambient noise level present
during a presentation.
7. Adjust the RANGE level so that the ambient noise is
not completely muted. At the same time, confirm
that the gate opens when you talk into the
microphone. If you lower the volume too much, the
timing to open the gate will be delayed when you
talk on the microphone. This may cause a
momentary microphone off when starting to speak.
8. Adjust the ATTACK, HOLD, and RELEASE times.
ATTACK time means the response time when the gate
opens or the compressor works. As a rough
guideline, set it to 50 ms or less.
HOLD time suppresses the rapid change of gain by
maintaining the condition of the gate and
compressor. 10 ms to 100 ms may be a suitable
value. If you want to eliminate any unnatural sound
that may occur for a short duration just after talking,
set a short HOLD time value. If the gate closes
between words while speaking, set a longer value.
RELEASE time is the response time it takes from the
gate opening and closing, the compressor stopping,
and the gain returning to normal. 100 ms to 300 ms
may be an appropriate value. If the level rapidly
changes and the voice is interrupted, set a longer
RELEASE time. If you are worried about the noise
made by the gate closing, set a shorter time.
9. Setting is now complete, so close the AGC screen.

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