Lexicon PCM 80 - Manual (Page 25)

2-7
Basic Operation
If digital audio is interrupted by lock or range errors, or by transmission of non-
audio data, the digital input will be muted. Whenever this occurs, the PCM 80
remains functional, while an error message, such as those shown below, is
displayed.
Error : Out Of Range
(Press any button)
Error : Lock
(Press any button)
Error : Non Audio
(Press any button)
Any such message will remain on the display until you dismiss it by pressing any
front panel button. If the condition causing the error is corrected, and the digital
input is unmuted, the message will still remain until you dismiss it to ensure that
you are informed of a condition that has muted digital audio, even if only for a brief
period of time. Once the message is dismissed, the display will return to its
previous state.
Some errors detected in an incoming digital
audio signal will cause the PCM 80 to mute the
digital input. When this happens, the Dig In Lvl
display will show both the level you selected,
and the fact that the signal is muted.
Audio Dig In Lvl
0.2 30% (Muted)
If you select the Dig In Lvl parameter while there is a lock, range, or non-audio
error, the display will continue to show the level you have selected, and
parenthetically show that the signal has been muted.
Note, if Word Clock is set to Int, Dig In Lvl is disabled. You must select Ext to
process digital audio.
0.3 Auto Lock
When Word Clock is set to Ext, and the PCM 80 loses lock with an incoming
digital audio signal, it will immediately switch to Internal Clock at the sample rate
of the digital signal last detected. The Auto Lock control allows you to choose
whether or not the PCM 80 will continuously try to re-establish lock. Use
ADJUST to select On (continuous retry), or Off (continue to use Internal Clock
as a timing reference until Ext is reselected).
0.4 SCMS
Digital audio signals, in order to comply with copyright standards, are encoded
with control information which can limit the ability to copy audio data. This control
information is generally known as SCMS (Serial Copy Management System).
Under this system, you can choose to have the audio material processed by the
PCM 80 encoded to allow one of three levels of copy restriction. To make your
selection, use ADJUST to select No Copy, One Copy, or Multi Copy.