Toa M-633D - Manual (Page 22)

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11. SETTING THE AUTOMATIC MUTE FUNCTION
11.1. What is the Automatic Mute Function (AUTO MUTE)?
It is a function that attenuates the signal input to the STEREO 1 through 3 by detecting signals input to the
MONO 1 – 6.
AUTO MUTE is also called as Ducker.
This function helps to have paging announcements heard distinctly by attenuating the BGM volume when
initiating the announcement during BGM broadcast.
Stereo input signal
Monaural input signal
Mute
level
Level
Time
Release time
Announcement
ends.
Announcement
starts.
About 2 seconds
30 dB
–∞ dB
Tip
A release time is the period of time from the announcement end to the stereo signal mute release start.
11.2. Setting the Automatic Mute Function
Use the rear-mounted AUTO MUTE switch to set the Automatic Mute function.
Shifting the AUTO MUTE switch to the ON position turns on the AUTO MUTE function. Shifting it to the OFF
position turns off the AUTO MUTE function.
Tip
The input level indicators of the STEREO 1 – 3 light orange while these signals are being attenuated.
The attenuation level is 30 dB.