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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
Manual part no: DOC1241121A1
Page 98
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
Spot Q Noise for DSD Filters, F Weighted
in 400 Hz bandwidth
-280
-260
-240
-220
-200
-180
-160
-140
-120
-100
-80
0.1 1 10 100 1000
Frequency (kHz)
Q Noise rel Full Scale DSD (dB)
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
20
F weighting (dB)
F1
F2
F3
F4
F5
F6
F7
F weighting curve
(
ri
g
ht hand scale
)
Figure 38 – DSD Output, F weighted Q Noise for the various Filter options
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 39 – DSD showing 0 dB0 (full scale)
DSD has only two levels – printer artefacts make it look like more