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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
Manual part no: DOC1241121A1
Page 46
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
In Out Number of Filters Available
DSD DSD 8
PCM DSD 8
192 96 4
176.4 88.2 4
176.4 44.1 4
96 48 4
96 44.1 4
88.2 44.1 4
48 44.1 4
44.1 96 4
Table 3 – Conversions with Multiple Filter Options
We encourage you to experiment with the filters, to find the one that sounds
best for your particular application. Do not assume that one filter is best for all
applications!
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The menu is dynamic - that is, it updates to show valid selections. For example,
Fs In = 96kHz, Fs Out = 44.1kHz has 4 options and shows:
While Fs In = 96kHz, Fs Out = 88.2kHz has only one option and shows:
The dCS 974 remembers the last filter selection for every conversion, so if you
choose Filter 4 for 96Ö44.1 and Filter 2 for 96Ö48, these separate settings will
be stored and loaded when you switch between them.
Output Word Length
Select the required Word Length from the list and press Set.
IMPORTANT!
The dCS 974 generates long word length (24 bit) data and truncating this
adds extra noise. It can also add highly undesirable behaviour at low signal
levels. We recommend that you use a high order noise shaping function, but
see the section Word Length Reduction, page 104 and try for yourself.
This is a seriously major topic, and you should experiment.
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The reports we receive from users suggest that for PCM work, Filter 2 is well suited to some classical music,
and that Filters 3 and sometimes 4 suit rock. However, views vary quite a lot.