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RLC-4 V1.79 Copyright © 1998 Link Communications Inc. 9/18/98
The Digital Voice Recorder
What the DVR is:
The optional DVR is a device that allows you to record sounds, store them in memory and play
them at any time. It can be used to personalize your controller by recording any message or sounds
that you want and playing them back for IDs or other messages.
Interfacing:
The DVR plugs into the “options” connector on the RLC-4. It will fit inside the optional rack
mount cabinet.
Recording Time:
The voice storage chip on the DVR is capable of storing 75 seconds of audio. Many short
messages or several longer messages can be stored as long as the total time of all of the messages is
not more than 75 seconds.
Adjusting the DVR:
There are only two adjustments on the DVR: record level and playback level. Both are preset
before the DVRs are shipped, and should not need to be changed, at least for initial testing.
When/if you do decide to adjust the levels, the playback level should be set so that the audio is
played back at the same volume it was when it was "live". If you decide to change the record level,
the playback level should be adjusted again before any judgement is made as to whether the new
record level is better or worse. The record level is important because it affects the quality of the
recording. If it is set too low, the full resolution of the storage chip will not be utilized and there
will be more background noise in the audio than is necessary. If the record level is set too high, the
audio peaks will be clipped off and the audio will sound distorted, especially the loudest parts.
There are many factors that determine the best level, so experiment and adjust the record level until
it sounds the best. Looking at the audio with a scope as it is played back will help identify if the
record level is set too loud, as the top and bottom of the waves will be flattened (a little bit of
clipping on the louder parts is normal and expected).
Recording DVR Tracks:
To record a track using COR to start and stop the recording, you should enter the record command
followed the track number, "025 TT" (where TT is the track number), then unkey (to tell the
controller to execute that command and get ready to record). Then key up and start speaking your
message. When you are finished, simply unkey. The DVR will automatically delete a fraction of a
second of the beginning and end of your message to get rid of any noise caused by keying or
unkeying.
If you wish to record a track without using COR, such as from the reverse autopatch in
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