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dCS 954 User Manual Manual for Standard Software Version 1.5x
dCS Ltd June 2000
Manual part no: DOC136954 iss 2B1
Page 40
file 135954ma2b1.pdf 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
DSD
DSD is a single bit very high sample rate (2.822 MS/s) format, where the single
bit words are heavily noise shaped to push noise energy above the audio band.
The frequency response is very high (well above 100kHz) although at these high
frequencies, much noise is also present.
The SACD format sets 0 dB0
DSD
to be 6 dB below the peak to peak level one
might expect a full scale sinewave to occupy. This ensures that artefacts that
begin to occur at the limits of the DSD range at the production stage do not
move down into the audio band.
DSD Format, showing Full Scale Signal
dCS 972 SW v1.54
-1.5
-1
-0.5
0
0.5
1
1.5
0 50 100 150 200 250 300 350 400 450 500
Time (usecs)
Figure 18 – DSD, showing DSD full scale
DSD has only two levels – printer artefacts make it look like more.
Electrically, TTL levels are used. There is no framing or block structure, and
each channel uses one BNC connector. The Word Clock uses the third
connector. See “DSD on SDIF-2” on page 54.