3 - System setup—CLOCK setup
3–3
3
Select the clock source by pressing
ENTER
.
The popup panel provides information about
the potential clock source. Press
ENTER
to
select this source, or any one of the cursor
keys to dismiss the popup panel, and select
another source.
In the case of an IF-AE4000 (AES/EBU
interface card), there are four different
sources (the four AES/EBU inputs) which
may be selected as the word clock source for
the TM-D4000.
If the TM-D4000 has been cascaded from
another unit, the clock source is set as
CASCADE
and cannot be changed. The
“head” of the cascade chain can select the
clock from any source.
In the case of an IF-TD4000 (TDIF-1 inter-
face card), the device attached to the card
source is shown as either a
DA88
( DA-88
DTRS recorder) or
OTHER
(another type
of recorder connected through the TDIF-1
interface). If the indicator shows DA88, then
I/O data is truncated to 16 bits, otherwise I/O
is carried out at 24 bits.
In the case of an IF-LP4000 (ADAT “light-
pipe” interface card), there are three
options:
INT
,
SYNC
or
DIGI
. If more
than one IF-LP4000 is fitted, changing the
setting for one card will change the settings
for all the rest. The
INT
setting allows the
ADAT to act as the clock master (this is not a
recommended setting). If
SYNC
is selected,
the ADAT receives its clock through the
SYNC
cable, and if
DIGI
is selected, the
optical connection is used as the clock source
to the ADAT. We strongly suggest that
SYNC
is used, rather than
DIGI
, if the
ADAT is to be a word clock slave, especially
if more than one ADAT is connected. See also
9.4.4, “ADAT devices”.
If more than one IF-LP4000 card is fitted,
there are three choices for each card, regard-
less of the actual connection of the ADAT
units to the TM-D4000. The last on-screen
button pressed (on any of the IF-LP4000
options) then determines the status of the
first ADAT in the chain.
1
4
If the clock source has been selected as
INT
,
the clock rate (sampling frequency) can be
selected. In all other cases, the sampling fre-
quency is fixed and cannot be changed.
3.2.1 Selecting clock frequencies
Word clock sources, except for
WORD
and
ADAT
sources, include information regarding their sam-
pling frequencies. If either
WORD
or
ADAT
is
selected as a clock source, the procedure below
should be followed:
1
Decide what sampling frequency the project
will use.
2
Select
INT
as the clock source (this is a
temporary measure), and select the fre-
quency.
3
Select the final clock source (
WORD
or
ADAT
). The TM-D4000 sampling fre-
quency will now match the incoming word
clock.
1. Note that the other ADAT units, “daisy-
chained” to the first ADAT unit in the chain
with SYNC connections, will be automatically
set to take their clock from the SYNC connec-
tor, and their IDs will also be set automati-
cally, regardless of setting made here.
