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Program audio mute
To mute the program audio output, press the Program Audio Mute button. The
indicator LED to the right of the button lights when the program audio is muted.
Press the Program Audio Mute button again to unmute the output. Program audio
mute does not mute the microphone.
Talk-over (program ducking)
When the MPS detects a voice (an audio signal at a level above the "talk-over"
threshold) at the mic input, the MPS immediately lowers ("ducks") the program
audio volume. The default level (amount) of ducking is set to 6 dB. For MPS units
with firmware revision 1.10 and up, the ducking level can be set between 0 dB and
30 dB via RS-232 control.
When voice input via the mic input stops for 5 seconds or longer, the MPS program
volume slowly ramps up to the original volume over a period of about 1 second.
Microphone controls
Turn mic or phantom power on/off
To turn on the microphone power (15 V on the MPS 112, 48 V phantom power on
the MPS 112CS), press and hold the Mode button for more than 2 seconds until the
front panel LEDs change to view mode, then press and release the Mic Power On/
Off button. On both switchers, while the Mode button is pressed, the fourth LED of
the Video/Audio group is lit when the mic power is on. On the MPS 112CS, the
Phantom Power LED on the rear panel is also lit when the phantom power is on.
Release the Mode button when the power has been turned on or off (the LED
resumes input indication).
Mic mix
To mix the microphone input with the program audio output ("talk-over" mode),
press the Mic Mix button. The indicator LED to the right of the button lights when
the Mic Mix is on. Press the Mic Mix button again to unmix the output.
Talk-over (program ducking)
When the MPS detects a voice (an audio signal at a level above the "talk-over"
threshold) at the mic input, the MPS immediately lowers ("ducks") the program
audio volume. The default level (amount) of ducking is set to 6 dB. For MPS units
with firmware revision 1.10 and up, the ducking level can be set between 0 dB and
30 dB via RS-232 control.
When voice input via the mic input stops for 5 seconds or longer, the MPS program
volume slowly ramps up to the original volume over a period of about 1 second.
Mic volume
After turning on the mic mix, use the Mic Volume control knob to adjust the
volume of the microphone output. When the volume control knob is turned, the
volume increases at a rate of 1 dB per step of the digital potentiometer.
Reset mic volume
To reset the mic volume to the default level (0 dB), press and hold the Mode button,
then press and release the third button (labeled Mic Vol. Reset) of the Video/Audio
group within two seconds. Release the Mode button when the volume has been reset.
Setting mic "talk-over" threshold
1.
Finish installation wiring and setup as described in the previous sections.
2.
Turn on the microphone by pressing the Mix button.
MPS 112 Series • Operation
3-7
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