Model VR240 Audio Logging Recorder
3-28
January 2000
NOTE
There are two different sets of
RecEnable
options available with
the VR240. One set is used when the unit is equipped with a
telephone board. A different set is used with an audio board. The
differences are as follows:
3-27.1 Telephone Board - RecEnable Modes.
VOX (Voice Activated)
, the factory default mode, records on a given channel when an audio
signal is present on that channel. VOX options are described in detail in paragraph 3-28.
Off Hook:
Records on a channel only when the DC voltage level drops below the off hook
threshold (such as a decrease in voltage caused when the receiver is lifted from its cradle).
Should be used to record pure analog
or “central-office” type phone lines.
Automatic (VOX and Off Hook):
Records on a given channel when an audio signal is above
the VOX threshold level and there is a decrease in voltage detected. Inputs set on Automatic
Mode will record continuously when there is no audio source connected to the input port.
On Trigger:
Records on a channel only when the channel set as a “trigger channel” is
recording. (Refer to the Installation section for information on the input signal requirements.)
Instructions for setting a “trigger channel” are located in paragraph 3-22.
Disabled
, prevents recording on the channel under any circumstances.
By proper selection of
Mode
, you can easily control when a channel records its input. The
VOX
mode is most effective when you are recording the output of a scanner or other piece of
equipment that provides no indication (other than the audio signal itself) that there is a signal to
record. This is ideal for non-critical applications in which, for instance, you are only interested in
the content of a message and not interested in the timing, since the recording will shut off
automatically during long pauses or interruptions. The
Off Hook
mode is most appropriate for
recording telephone lines and assures that the recorder will continue operating even during
periods of almost-silence, such as when a party to a call may be speaking very softly. The
Automatic (VOX and Off Hook)
mode records when both the
VOX
circuitry detects a signal
and there is a sufficient voltage drop indicating an
Off Hook
condition. Note that you cannot
change the individual channel modes while the VR240 is recording since the
Setup
functions
are only available when the unit is in a
Ready
mode.
NOTE
Check with your local telephone provider to see what type of audio
is available. Some digital systems may require special adapters.
3-27.2 Audio Board - RecEnable Modes.
Automatic
, the factory default mode, records on a given channel when an audio signal is
present on that channel. VOX options are described in detail in paragraph 3-28.
