Extron electronic MPS 112CS Microphone controls, Program audio mute, Talk-over program ducking

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