Lexicon PCM 91, User Manual

Page: 26 / 163

Lexicon
2-4
PCM 91 User Guide
Control Mode
Selections of various system states and conditions are made in Control Mode.
Press Control to enter this mode. The Control button LED will light to indicate
that the mode is active. Note that Control Mode functions are not available when
the Compare function is active.
The Control Mode matrix is shown below, followed by descriptions of each
available selection.
0.0 Ext: XLR Prf 48
Audio
✱
Input Source
0.0 Ext: Cns 48kHz
Audio
✱
Input Source
Row 0
Audio
0.0 Input Source
The PCM 91 can use its own internal clock as a timing reference, or it can
reference an external clock source from the rear panel S/PDIF or AES jacks. Use
ADJUST to select Ext XLR (AES), Ext Coax (S/PDIF), Int: 48kHz or Int:
44.1kHz. When either analog rate is selected, the digital input is disabled. To
process audio from the digital input, you must select Ext.
When External clock is selected, and the PCM 91 detects valid digital audio, the
rate of the external word clock will be displayed with a label indicating the digital
audio format type: Prf (Professional) or Cns (Consumer, also called S/PDIF).
Simultaneously press Up
and Down to return to 0.0.
An asterisk (
✱
) accompanying a parameter name indicates that there are subparameters available
at that matrix location. The Load /
✱
LED will light whenever an asterisk appears in the display. Press
Load /
✱
to step to the next subparameter. From any point in the matrix, press Up or Down together
with Load /
✱
to backstep to the previous parameter.
When the PCM 91 is receiving valid digital audio, selecting Input Source
will display the input connector, audio format and the rate of the incoming
signal.