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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
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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)
Amplitude (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
Amplitude (lsb 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