dCS 974 User Manual
Manual for Software Version 1.0x
dCS Ltd
May 2001
Figure 1 – Audio Input Selection .......................................................................
11
Figure 2 – Sync Source Selection .....................................................................
13
Figure 3 – Pure Format Conversion ..................................................................
15
Figure 4 – Sample Rate Conversion .................................................................
16
Figure 5 – Setting Wordlength, Noise Shaping and Dither ...............................
19
Figure 6 – Double Speed 24/96 to CD format...................................................
22
Figure 7 – Converting dual AES 24/96 to a single wire double speed one.......
23
Figure 8 – Upsampling a CD to 24/96 (or 24/192) ............................................
24
Figure 9 – General Sample Rate Conversion ...................................................
25
Figure 10 – PCM to DSD conversion ................................................................
26
Figure 11 – Using a Master Clock .....................................................................
27
Figure 12 – Converting Quad AES to CD format ..............................................
28
Figure 13 – Multi-channel Sample Rate Conversion with bit aligned source....
29
Figure 14 – Multi-channel Sample Rate Conversion with Master Clock ...........
30
Figure 15 – Multi-channel Sample Rate Conversion with more alignment
tolerance.............................................................................................
31
Figure 16 – Multi-channel Sample Rate Conversion with multiple sample rates
out ......................................................................................................
33
Figure 17– Rear Panel ......................................................................................
66
Figure 18 – Front Panel.....................................................................................
68
Figure 19 – Transient Performance of 44.1 kS/s Filter Options ........................
73
Figure 20 – Transient Performance of 96 kS/s Filter Options ...........................
74
Figure 21 – Wordclock and AES3 outputs, 96 kS/s ..........................................
77
Figure 22 – Wordclock and AES3 outputs, 44.1 kS/s .......................................
Figure 23 – Wordclock in to Wordclock out, 96 kS/s.........................................
78
Figure 24 – Wordclock in to Wordclock out, 44.1 kS/s......................................
Figure 25 – AES3 in to AES3 out, 96 kS/s ........................................................
79
Figure 26 – AES3 in to AES3 out, 44.1 kS/s .....................................................
Figure 27 – DSD data and Wordclock out.........................................................
80
Figure 28 – 44.1 kS/s to 96 kS/s PCM, showing AES3 alignment....................
82
Figure 29 – 96 kS/s to 44.1 kS/s PCM, showing AES3 alignment....................
Figure 30 – 44.1 kS/s to DSD, showing DSD bit alignment ..............................
83
Figure 31 – Dither PDFs....................................................................................
94
Figure 32 – Dither Spectra (FFTs) ....................................................................
95
Figure 33 – Small Signal Raw Data with Dithers...............................................
Figure 34 – Truncated small signal FFT, with and without dither......................
96
Figure 35 – Truncated small signal FFT, showing noise shaping with and
without dither......................................................................................
Figure 36 – DSD output, spot Q Noise for the various Filter options ................
97
Figure 37 – DSD Output, integrated Q Noise for the various Filter options ......
Figure 38 – DSD Output, F weighted Q Noise for the various Filter options ....
98
Figure 39 – DSD showing 0 dB0 (full scale)......................................................
Figure 40 – 48 kS/s to 44.1 kS/s conversion, Filter responses .........................
99
Figure 41 – 96 kS/s to 44.1 kS/s conversion, Filter responses .........................
Figure 42 – 32 kS/s noise shaper curves ........................................................
100
Figure 43 – 44.1 kS/s noise shaper curves .....................................................
Figure 44 – 48 kS/s noise shaper curves ........................................................
101
Figure 45 – 88.2 kS/s noise shaper curves .....................................................
Figure 46 – 96 kS/s noise shaper curves ........................................................
102
Figure 47 – Noise shaper noise and weighted noise vs order ........................
Figure 48 – Noise Shaping and Dither Spectra...............................................
107
Figure 49 – Truncation Only Spectra...............................................................
Figure 50 – Noise Gain and Weighted Noise Gain by Shaper Order and Sample
Rate..................................................................................................
108
Figure 51 – Changing the Mains Fuse ............................................................
116
Manual part no: DOC1241121A1
Page 125
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
