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AUTOMATIC MIC MIXING •
MICROPHONE PARAMETERS AND MODES
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The following parameters and modes are used on the XAP 800 to provide high
precision and reliability in microphone mixing:
Mixer Mode. The XAP 800 can be set in two different mixer modes to
accommodate a variety of installation needs: master or slave. When placed in the
master mode, the unit acts as a stand-alone eight channel automatic microphone
mixer. The master mode is also used for the master unit in a multiple-unit
configuration. Slave mode is used for slave units in a multiple-unit configuration.
Chairman Override: This provides gating priority for all microphones selected for
the chairman override group. When a mic in this group gates on, all microphones not
included in this group gate off.
PA Adaptive (On or Off). The problem: Speaker audio gates on microphones when it
shouldn’t. The solution: PA adaptive knows when speaker channels are activated and
prevents the speakers from gating the mics on. The reason the XAP 800 can
accurately determine when loudspeaker audio is present is because audio goes
through the XAP 800 a few milliseconds before it reaches the microphone.
Maximum Number of Microphones On (1-8 or Off). This mode allows you to
program how many microphones (maximum) can be activated simultaneously.
Generally, there isn’t a need for more than two or three people to speak at the same
time.
First Mic Priority Mode (On or Off). This feature increases the audio level required to
gate on additional microphones after the first mic gates on. This helps ensure that
only one mic gates on when a person speaks.
Last Mic On/Mic1-8/Off. Last Mic On leaves the last activated mic on until a new
one is activated. Mic 1-8 mode reverts back to the mic you’ve selected for Mic 1-8 On
when all other mics gate off. These features are useful to ensure the audio never goes
completely away. Without it, you might even think that you have lost connection to the
other room. You can set this parameter to Off, which disables this function.
The following are depicted in Figure 13:
Gate Ratio Adjust (0 to 50dB). This specifies how much louder the audio level must
be above the ambient level to gate on. If, for example, the gate threshold is set at
35dB, it will take more than 35dB of audio above the ambient level in the room to
activate the microphone. The ambient audio level can be specified or the adaptive
ambient mode can be turned on. In this case, the ambient room level changes or
adapts as the noise floor changes.
Off Attenuation (0 to 50dB). This sets how much a gated input is attenuated when it
is not on.
Hold Time (.1 to 8.0 seconds). This programs how long the mic stays gated on after
audio is no longer present.
Decay Rate (slow, medium, fast). This programs how quickly the audio level
attenuates to the Off Attenuation level after the hold time has expired.
Manual Ambient Level (0 to -80dB). This setting is relevant only if the adaptive
ambient mode is disabled on the individual gated inputs. This ambient level is then
used in conjunction with the gate threshold to determine whether or not the mic
should turn on.
Summary of Contents for XAP 800
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