dCS 904 User Manual

Manual for Software Version 1.5x and 1.36

dCS Ltd

June 2000

 

 

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

 

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