Toa M-9000M2 v.2.00 - Manual (Page 41)

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8.3. Glossary
(1) Scene
A "Scene" is a unit of broadcast patterns when the M-9000M2 amplifier is used as a mixer pre-amplifier.
Up to 32 types of patterns where various parameters are set can be saved into a Scene memory.
The saved Scene memory can be recalled, allowing operation by switching the broadcast patterns.
The following items describe the functions regarding the Scene.
(1-1) Gate function
Passes or cuts input signals depending on the input signal level. The gate opens when the input signal
level exceeds the set gate threshold level, allowing the signal to pass through. When the input signal
level falls below the gate threshold level, the gate closes after the set gate release time has passed.
This function helps to prevent unused microphone inputs from picking up noises.
The setting conditions are defined among the Gate function, NOM function, and VOX function. (Refer to
p. 43 .)
(1-2) NOM (Number of Open Microphones) attenuation function
The number of open microphones (NOM) is defined as the number of open-gate input channels.
The NOM attenuation function automatically adjusts an output gain depending on the number of open
(active) microphones whose input signal level exceeds the set gate threshold level.
The output gain is attenuated by the value set on the Utility function setting screen (
p. 79-C3 ) each time
the number of open microphones doubles.
This function prevents acoustic feedback from easily occurring when 2 or more microphones' signals
are simultaneously input.
The number of open microphones is obtained by counting all the NOM function-enabled input channels
regardless of whether the paging settings have been performed or not for these input channels.
(1-3) ANC (Ambient Noise Control) function
Adjusts the amplifier's output volume in response to the change in ambient noise level. The output
volume automatically changes as the ambient noise level goes above or below the set reference level.
This function allows the optimum output volume to be gained depending on the ambient noise level
when broadcasts are made to places where the ambient noise level changes significantly.
(2) Paging function
Allows paging calls from the input with paging priority to go through to the designated output by means of
the set paging trigger. Up to 32 paging patterns can be saved into the M-9000M2's internal memory, and
retained even if the scene is switched.
Terminating the paging calls restores the original broadcast in a fade-in manner.
(2-1) Paging settings
A combination of outputs through which paging calls are made is referred to as "Paging group."
Each paging setting can contain one input, one paging trigger, a paging group comprised of up to 8
output channels, and a combination of up to 12 interlocked contact outputs.
(2-2) Paging trigger
An event to activate paging calls.
Four types of paging triggers by means of the followings can be set: control input terminals, telephone
paging, remote activation (ZM-9001/9002, ZM-9011/9012/9013/9014), and VOX (Voice Operated
Exchange).
(2-3) VOX (Voice Operated Exchange) function
A paging trigger using the level detection function. Setting the VOX function to ON for an input channel
allows paging calls to be broadcast when the input signal level exceeds the set VOX threshold level.
If the input signal level keeps dropped below the set VOX threshold level, the paging calls are
terminated after the set VOX release time has elapsed. This function enables paging calls to be made
by use of a microphone or other input sources having no control function.
The gate and NOM functions cannot be used for the VOX-enabled input channels.