DCS Digital to Digital Converter 사용자 설명서
dCS 974 User Manual
Manual for Software Version 1.0x
dCS Ltd
May 2001
Manual part no: DOC1241121A1
Page 45
Document No: OS-MA-A0124-112.1A1
Contact
dCS
on + 44 1799 531 999
email to: more@dcsltd.co.uk
(inside the UK replace + 44 with 0)
web site: www.dcsltd.co.uk
For a 2 Pass conversion, convert the input to an intermediate sample rate and
either feed it direct into another dCS 974 or record the result, then convert from
the intermediate sample rate to the required sample rate. You can always
choose one of 44.1 kS/s or 48 kS/s as the intermediate sample rate, so you can
record the intermediate pass on most recording devices.
either feed it direct into another dCS 974 or record the result, then convert from
the intermediate sample rate to the required sample rate. You can always
choose one of 44.1 kS/s or 48 kS/s as the intermediate sample rate, so you can
record the intermediate pass on most recording devices.
However, it is best to use the highest possible sample rate for the intermediate
pass, if your recording device can take it. For example, to convert from 192 kS/s
to 12 kS/s, first convert from 192 kS/s to 96 kS/s, and then convert from
96 kS/s to 12 kS/s. Use of two dCS 974’s avoids intermediate storage.
pass, if your recording device can take it. For example, to convert from 192 kS/s
to 12 kS/s, first convert from 192 kS/s to 96 kS/s, and then convert from
96 kS/s to 12 kS/s. Use of two dCS 974’s avoids intermediate storage.
Output Mode
For DSD output, select
DSD SDIF-2
or
DSD SDIF-3
, and the unit will make the
appropriate changes. The unit supports DSD out with either DSD or PCM in.
DSD output includes a DSD DC blocking filter. All signals in DSD or PCM will
have their DC filtered out. When set to either DSD output mode, a DSD Quad
signal appears on four output cables –
DSD output includes a DSD DC blocking filter. All signals in DSD or PCM will
have their DC filtered out. When set to either DSD output mode, a DSD Quad
signal appears on four output cables –
AES 1, AES 2, AES 3
and
AES 4
. The 3
SPDIF outputs all carry identical AES streams with no data – they may be used
for synchronisation.
for synchronisation.
For PCM output, select
Dual AES
to output a 192kS/s, 176.4kS/s, 96 kS/s or
88.2 kS/s AES3 signal on two output cables –
AES 1
and
AES 2
(or
AES 3
and
AES 4
). In this mode, the
AES Clk Output
and 3 SPDIF outputs all carry
identical AES streams with no data – they may be used for synchronisation. The
SDIF Clk Output
sends Wordclock at the same rate as on
AES 1
, do not use
the SDIF data outputs while in
Dual AES
mode.
For PCM output, select
Quad AES
to output a 192kS/s or 176.4kS/s AES3
signal on four output cables –
AES 1, AES 2, AES 3
and
AES 4
. In this mode,
the
AES Clk Output
and 3 SPDIF outputs all carry identical AES streams with
no data – they may be used for synchronisation. The
SDIF Clk Output
sends
Wordclock at the same rate as on
AES 1
, do not use the SDIF data outputs
while in
Quad AES
mode.
Otherwise, set to
Normal
for single wire outputs on
AES 1, AES 2, AES 3
&
AES 4
, the three SPDIF outputs and the SDIF-2 output.
For PCM out, the unit can have PCM or DSD in.
Filter
The dCS 974 offers a choice of filter for use on some of the more popular in/out
combinations. The filters offer differing responses. For PCM outputs,
combinations. The filters offer differing responses. For PCM outputs,
Filter 1
in
each case offers the sharpest cut-off and no or least aliasing, but longest
energy smear.
energy smear.
Filter 4
gives the gentlest roll-off (usually with significant aliasing)
but the shortest transient response with least smear. For
DSD
output, the
differences are not so great – the responses are given in the section
. The conversions that offer multiple filters are
as follows: