DCS Computer Hardware dCS 974 User Manual
dCS 974 User Manual
Manual for Software Version 1.0x
dCS Ltd
May 2001
Manual part no: DOC1241121A1
Page 95
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
Dither Only Spectra, no Signal
dCS 972 SW v1.54
-150
-140
-130
-120
-110
0
2
4
6
8
10
12
14
16
18
20
22
Frequency (kHz)
A
m
pl
itu
de (
dB
)
Top Hat dither, actual
theoretical
Triangular dither, actual
theoretical
Noise Shaped Triangular dither, actual
theoretical
44.1 kS/s sampling, 16 bit dither, 1024 point FFTs, H6 window
Figure 32 – Dither Spectra (FFTs)
Raw Data for Source and Truncated Small Signal
dCS 972 SW v1.54
-2048
-1024
0
1024
2048
0
128
256
384
512
Sample Number
A
m
pl
itude (
ls
b
24)
24 bit source data
16 bit truncation
16 bit truncation with Top Hat dither
16 bit truncation with Triangular dither
16 bit truncation with Noise Shaped Triangular dither
Figure 33 – Small Signal Raw Data with Dithers