Clear-Com HX System Frames - Manual (Page 91)

5.21.8 Voice operated switch
Four settings are available under Port Properties > Voice Operated Switch. These
settings determine how the audio gate operates.
• Audio Gating Delay determines how quickly the audio gate closes when the
operator stops speaking. Adjust this value so that the audio gate does not close
too early and cut off words at the end of sentences or during small gaps.
• Audio Gating turns the audio gate function on or off. By default, this setting is off.
This function gates (performs a logical AND) on the crosspoint and the Vox
detection threshold. If the crosspoint is made from the port and the input Vox level
exceeds the detection threshold then audio is passed to the port.
• Audio Presence Tally (also known as Vox tally) causes a panel’s listen key to
flash on a panel whenever audio above the set threshold level is detected.
• Audio Detection Threshold sets the audio level at which the audio gate opens and
closes. Typically the threshold value is set at the level of a human voice, so that
when a person speaks into the microphone, the audio gate switches open to allow
audio onto the intercom line. When the person stops speaking, the gate closes,
regardless of the fact that background noise may be present.
Recommended levels are -3dB for panels and -20dB for interfaces.
If the VOX control option is configured, VOX activates when the gate opens.
Audio gating delay
This option determines the length of delay in seconds before the audio gate closes after
the audio level falls below the preset threshold.
To set the Audio Gating Delay:
1) In Port Properties > Voice Operated Switch, click Audio Gating Delay. A level
adjustment slider is displayed on screen.
2) Drag the level adjust slider to the desired setting from 0 to 4 seconds. The greater
the value the longer the delay before the audio is cut. This can be used to ensure
that the audio is not cut during short pauses.
3) Click outside the Voice Operated Switch section to close the virtual slider box.
The new delay value is displayed.
Audio gating
An audio gate allows EHX to restrict or gate background noise at a panel microphone or
interface’s input so that the background noise does not transmit to the intercom line. When
the audio gate is activated the panel or interface operates as a flexible voice operated
switch, which only transmits audio when it detects an audio signal characteristic level.
To enable Audio Gating
1) In the Audio Detection Threshold section of a port’s Advanced Settings, click
Audio Gating.
A drop-down arrow appears on the screen.
2) Click the drop-down arrow to turn the audio gating feature on or off.
91 Eclipse EHX Software User Guide