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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
Manual part no: DOC1241121A1
Page 124
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
I
NDEXES AND
S
OFTWARE
V
ERSION
N
UMBERS
This manual is for software version 1.0x. v1.0x versions differ only in a few
minor bug fixes.
Definitions of Units
dB0 Level in decibels, referred to a full scale sine wave
in a sampled system. So, 0 dB0 is full scale.
dB0
DSD
Level in decibels, referred to the defined full scale
sine wave in a DSD system. So, 0 dB0
DSD
is the
zero dB audio reference level.
dBu Level in decibels, referred to a 0.775V rms sine
wave, with no external loading (u = unloaded).
The level of 0.775V is derived from the older dBm,
for which the reference level is 1mW of signal
power into a 600Ω termination from an output with
600Ω source impedance.
kS/s Sample rate in kilo-samples per second. This
replaces kHz which is technically incorrect when
referring to sample rates.
SQNR Signal to Q noise ratio
Tables
Table 1 – Menu Tree ......................................................................................... 35
Table 2 – One Pass and Two Pass Conversions.............................................. 44
Table 3 – Conversions with Multiple Filter Options ........................................... 46
Table 4 – DSD Filter Summary.......................................................................... 71
Table 5 – DSD Filter Performance .................................................................... 72
Table 6 – Typical Spurious Level vs Conversion .............................................. 74
Table 7 – Group Delays, PCM to PCM transitions............................................ 75
Table 8 – Multiple Channel Sync mode – allowable input misalignment .......... 81
Table 9 – Noise Shape Orders by Output Sample Rate ................................... 84
Table 10 – Noise Added by Dither Types.......................................................... 85
Table 11 – AES/EBU Interface Electrical Characteristics. ................................ 86
Table 12 – DSD/SDIF Interface Electrical Characteristics. ............................... 86
Table 13 – SPDIF Interface Electrical Characteristics. ..................................... 86
Table 14 – SPDIF Optical Interface Characteristics.......................................... 87
Table 15 - SDIF-2 Message Table .................................................................... 90
Table 16 – Dither and Noise Shaping Noise Powers ...................................... 105
Table 17 - Options available............................................................................ 114
Table 18 – dCS Phone Numbers ..................................................................... 123