Filter
Top Products
Section 8 – Advanced operations
8-8 – 1.00 – 06/97
8.10 Digital recording
The DA-98 is able to accept (and output) digital
signals at the
DIGITAL I/O
connector [45] in TDIF-
1 format. The IF-88AE and IF-88SD interface
units provide conversion to and from AES/EBU
(and SP-DIF) and SDIF-2 formats.
The DA-98 should be connected to other TDIF-1
equipment using a PW-88D or PW-88DL connec-
tor cable.
The DA-98 should be set to be either a word clock
master or a word clock slave when connected to
other digital equipment. There can only be one
word clock master in a setup.
Since the TDIF-1 format carries a word clock as
part of the interface, there is no need to make a
word clock connection when recording through
the
DIGITAL I/O
connector.
8.10.1 Changing between digital and
analog inputs
To change between digital and analog inputs, sim-
ply press the
DIGITAL IN
switch [15]. The
DIGITAL
IN
indicator will light.
8.10.2 Selecting word length
When data is accepted through the
DIGITAL I/O
connector, the word length of the incoming data
must be set. This can be selected from between
16-bit, 20-bit or 24-bit. To set the word length:
1) Select menu 2, move the cursor to
,
and press
ENTER
:
2) Use the
UP
and
DOWN
keys to change the value
between
, and bits.
We suggest that you experiment with the dither
settings (see 8.13, “Dither”) if you find you are
recording quantization noise at low levels when
the input word length is set to 20 or 24 bits.
Though you will lose a little in the signal-to-noise
ratio, total harmonic distortion figures will be
improved.
8.11 Routing digital inputs
When recording analog signals, it’s usual to route
them through a console’s sub-grouping system or
if the number of groups is not sufficient, through
an external patchbay.
Neither of these is an easy option with digital sig-
nals, and so the DA-98 provides a kind of internal
patchbay in the form of the Track Copy function
(see 8.11.1, “Track Copy (channel-to-track rout-
ing)”).
The default setting for this feature is “straight
through”, as shown below.
WARNING
Only use a TASCAM digital cable when making digital
audio connections to the DA-98. Other types of cable
may cause damage to the system, and the warranty will
be voided if such damage is caused by use of the wrong
cables.
NOTE
If you attempt to record digitally from a digital source
which has a different frequency from that previously
recorded as the DA-98’s tape format, the Fs indicator
corresponding to the tapes sampling frequency will start
to flash. This indicates a frequency mismatch.
Recording with different sampling frequencies is not
recommended – problems will certainly occur on replay
of such a recording.
NOTE
If you are dubbing tracks from a DA-88, this value must
always be set to 16 bits.
3 4 5 6 7 821
1 2 3 4 5 6 7 8
3 4 5 6 7 821
1 2 3 4
5 6 7 8
Track Copy
Input 12345678 (Dig)
Tape
Track 12345678 on
Inputs
Tape
tracks