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dCS 904 User Manual Manual for Software Version 1.5x and 1.36
dCS Ltd June 2000
Manual part no: DOC135904 iss 2B2
Page 43
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
9th Order Noise Shape Plots
-84
-78
-72
-66
-60
-54
-48
-42
-36
-30
-24
-18
-12
-6
0
6
12
18
24
30
36
1 10 100
Frequency (kHz)
Noise Amplitude (dB)
32 kS/s
44.1 kS/s
48 kS/s
88.2 kS/s
96 kS/s
176.4 kS/s
192 kS/s
Figure 26 – 9
th
Order Noise Shapers implemented on dCS 904
The noise shaper plots above are all on the same vertical scales for easy
comparison, and the vertical grid is approximately 1 bit per grid line. Note that
for the audio band, 9
th
order noise shaping at 176.4 kS/s or 192 kS/s gives huge
gains (8 bits or more).
This means that recording these formats on 8 channel 44.1 kS/s or 48 kS/s
recording machines that store only 16 bits is quite practical, and there is, in
practice, very little quality loss.