Townshend Computer Tools DAT-Link User Manual page 88

84
dlmrec -N 4 -I -i SPDIF -p20 test
stores 8 channels (4 stereo pairs) of 20 bit/sample data recorded from
datlink1 datlink2
, , and
leaved, sample-by-sample, and stored in the le
only the start-time synchronization is performed in this case.
Although can used with any model
dlmrec
sion 1.6 or later provides the facility to guarantee that the signals acquired by the
multiple units are correctly time-aligned. Prior models will delay the individual
stereo-pairs by a variable amount.
DAT-Link
When +'s are used, the Sync connectors of each unit should be wired to
an external clock as described in section 9.1.1.
to guarantee that recording begins simultaneously for all units. If the data sources
for the units are phase-locked to each other and are aligned to an accuracy of at
least one-quarter of a sample, then this will result in the multiple channels being
exactly aligned. Otherwise, the recording from each channel will begin at the same
time within +/- one sample.
If one or more units connected to the external clock are not needed in a particular
command, they have to be forced ready. For example, if six
to the external clock, and you want to record on the three rst units only, then
datlink3 datlink4
, and
command :
dlmkrdy
dlmkrdy -u3
dlmkrdy -u4
dlmkrdy -u5
Then, the command
dlmrec -N3 test
datlink0 datlink1
waits until ,
stereo pairs), block-interleaved, at 16 bits/sample. Afterwards, to release the forced
, you use the commands:
READY
dlmkrdy -u3 -c
dlmkrdy -u4 -c
dlmkrdy -u5 -c
The way the channels are recorded to the le can be reordered using the
of . Its argument is a comma-separated list of
dlmrec
lowed by one of the letters:
The order of the list determines the mapping of channels to
datlink3
using their SPDIF inputs. The data is inter-
test
DAT-Link
dlmrec
datlink5
should have their
datlink2
and are
, , or . These signify left, right or stereo respectively.
L R S
Using Multiple DAT-Links
datlink0
. The data is self-clocking, so
DAT-Link
, only the +, ver-
then uses the
READY
DAT-Link
+'s are wired
signal forced using the
READY
and stores 6 channels (3
READY
-u
DAT-Link
+ unit numbers fol-
DAT-Link
+ units. For
,
signal
option