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dCS 904 User Manual Manual for Software Version 1.5x and 1.36
dCS Ltd June 2000
Manual part no: DOC135904 iss 2B2
Page 20
135904ma2b2.pdf file available from website
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
Menu Items
Issue -
Displays the software issue when
Set is pressed.
Filt -
Selects one of several anti-alias filter responses. The filters should be evaluated
by ear. Filt1 gives the sharpest cut off, just below half the sampling frequency.
This is the normal setting. Filt2, Filt3, Filt4 give progressively more relaxed
responses, degrading the alias performance but sharpening the impulse
response. This affects the stereo or multi-channel image. Different filters may
be appropriate for different material.
DSD -
Turns on DSD mode
and in P3D units cycles through the DSD format options
available (Off, On, P3D, DSD 4). When on, the unit displays “dSd”. The mode
takes about 15 seconds to load, during which time the menu cannot be used.
This mode is so different from PCM that most of the PCM related front panel
buttons are no longer appropriate. DSD is output on the BNC connectors, and
the following other changes occur:
- XLR outputs are clock only unless DSD 4
(or AES O on P3D units)
is on (see below).
- the BNC O options change to CL 1 (bit clock) or CL 64 (word clock)
- ADC/Data allows the SDIF connectors to be turned into inputs, so
that DSD data can be fed in and formatted
- Sample Rate, Multiplier, Mute, Word Length, Noise Shaping,
Overload Level, and Output Format buttons do not work
- the Tone Generator does not work
The Master/Slave button works and the Auto Slave function (see later in Menu
Items) works. Filt works – there are 7 filter options in DSD mode. See the
section on “DSD” starting on page 32 for more details – they trade-off in-band
and out-of-band noise.
DSD 4
(or AES O for P3D units) -
This function controls the use of the XLR connectors on DSD mode. There are
two options, whose behaviour depends on whether the unit is a P3D unit or not.
Standard (non P3D) units:
Off The XLRs carry AES clock only
On The XLRs carry DSD data packed into 4 AES3
links for storage on 16 bit 8 channel 44.1 kS/s PCM
machines (non P3D units)
P3D units:
Off XLRs carry AES clock only