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Crestron QM-FTSC
Operations & Installation Guide – DOC. 6269
Programming with VisionTools Pro-e
Touchpanel screens can be created in VT Pro-e to allow configuration of
phantom power, gain levels, gating levels, attack times, and decay times. Digital
Media Tools software already has these controls built in. Refer to the following
section "Adjusting the QM-FTSC Microphone Inputs" for additional
information.
Example Program
An example program for the QM-FTSC is available from the Crestron FTP site
(ftp://ftp.crestron.com/Examples). Search for the file named QM-FTSC.ZIP.
Adjusting the QM-FTSC Microphone Inputs
Once a QM-FTSC is installed and configured, settings for gain, gating level,
attack time, and decay time should be set using the Realtime Mode in Digital
Media Tools (version 3.00.00 or later). Digital Media Tools software can be
started from the SystemBuilder application.
NOTE: Crestron recommends that you use the latest software to take advantage
of the most recently released features. The latest software is available from the
Downloads | Software Updates section of the Crestron website
(www.crestron.com).
Definitions
The QM-FTSC allows for adjustments to be made to microphone input signals.
The following are definitions of terms that are commonly used when making
adjustments.
Attack Time
The time it takes (in milliseconds) from when an input signal rises above the
gating level until the microphone output signal is enabled.
Clipping
A condition in which a signal level exceeds the maximum level (the clipping
level) a circuit can handle. This is usually caused by improper gating parameters
and gain settings.
Decay Time
The time (in milliseconds) from when an input signal falls below the gating
level until the microphone output signal is muted.
Gain
An adjustable amplification to accommodate varying input signal levels.
Gating
Gating is a function that mutes a microphone signal when the input sound level
is below a user-set threshold (gating level).
The following diagram demonstrates clipping, attack time, decay time, and
gating level.
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FlipTop Storage Center: QM-FTSC • 31
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