dCS 904 User Manual

Manual for Software Version 1.5x and 1.36

dCS Ltd

June 2000

 

 

9th Order Noise Shape Plots

Noise Amplitude (dB)

36

 

 

30

 

 

24

 

 

18

 

 

12

 

 

6

 

 

0

 

 

-6

 

 

-12

 

 

-18

 

 

-24

 

 

-30

 

 

-36

 

32 kS/s

 

44.1 kS/s

-42

 

 

48 kS/s

-48

 

 

88.2 kS/s

-54

 

 

96 kS/s

-60

 

 

176.4 kS/s

-66

 

 

192 kS/s

-72

 

 

 

-78

 

 

-84

 

 

1

10

100

 

Frequency (kHz)

 

Figure 26 – 9th 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, 9th 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.

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