User Guide

dCS Purcell User Manual Manual for Software Issue 2.2x
dCS Ltd September 2004
Manual filename: Purcell Manual v2.2x.doc Page 25 email: [e-mail]
English version web-site: www.dcsltd.co.uk
WClk
WClkWClk
WClk - Wordclock
This setting allows Purcell to be synchronised to a Wordclock connected to the
Wordclock In socket while taking data from the selected digital input. This
helps reduce jitter. The Wordclock may be generated either by a master clock
or by the source equipment.
IMPORTANT! The source equipment MUST also be synchronised to the Wordclock.
do this: Select the input you want to synchronise to the Wordclock using the Input
button.
do this: Open the Menu and step through until the display shows WClk:Off or WClk: In.
do this: Press the
Select button to switch between these two options.
do this: When you have the option you want, wait for the Menu to time-out and the
display to revert to its normal mode.
Set to WClk:Off, Purcell ignores clock signals on the Wordclock In socket.
Set to WClk: In, Purcell remains locked to the selected input. If a Wordclock is
connected to the Wordclock In socket, Purcell automatically slaves to it. If the
Wordclock is not at a standard frequency, is out of capture range or is a
“superclock”, the unit will display Locking…, Fs=??? for 1 minute, then Revert
to Slave for 10 seconds and reset itself to WClk:Off.
This menu must be set separately for each selected input, allowing you to
synchronise some of your source equipment (for example a CD player running
at 44.1kS/s connected to the RCA input) to a 44.1kS/s master clock, while
synchronising equipment running at other sample rates (for example a DVD
player running at 48kS/s connected to the BNC input) to the data stream
instead.
Out Mode
Out ModeOut Mode
Out Mode - Output Mode
This menu page allows the AES output data to be formatted in one of two ways:
Single Use this mode if your DAC will not accept Dual
AES or DSD. In Single wire mode, PCM data is
available from all of the AES 1, AES 2, RCA and
BNC outputs at sample rates up to 96kS/s.
Dual AES Use this mode if your DAC will accept Dual AES.
This setting disappears if the output sample rate is
less than 88.2kS/s or set to DSD. If the output
sample rate is 88.2 or 96kS/s, setting Dual AES
mode formats the data as two 44.1 or 48kS/s data
streams on the AES 1 and AES 2 outputs. Dual
AES mode is automatically selected if the output
sample rate is 176.4 or 192kS/s. The DUAL
indicator in the Input Indicator block lights when
Dual AES is selected. Do not use the RCA, BNC
or 1394 outputs in this mode.
Setting the Output Mode x
do this: Open the Menu and step through until the display shows Out Mode.
do this: Press the
Select button. Assuming for the purpose of this illustration the
Output Mode is set to Single and the input sample rate is 96kS/s, the display
will change to Single.
do this: Press the
Select button slowly twice.
The display will cycle through Dual AES and Single.