DCS dCS 974, Digital to Digital Converter Definitions of Units, Tables, INDEXES AND SOFTWARE VERSION NUMBERS, dB0, dBu, kS/s, SQNR, dB0DSD

dCS 974 User Manual	Manual for Software Version 1.0x
dCS Ltd	May 2001

INDEXES AND SOFTWARE VERSION NUMBERS

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.
dB0DSD	Level in decibels, referred to the defined full scale
	sine wave in a DSD system. So, 0 dB0DSD 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

Manual part no: DOC1241121A1 Page 124 Document No: OS-MA-A0124-112.1A1

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