Volume Control; Balance Control; De-Emphasis; Analogue Outputs - DCS Elgar Plus User Manual

dCS Elgar Plus User Manual
dCS Ltd

Volume Control

Balance Control

De-Emphasis

Analogue Outputs

Clocking

Synchronising to source

Manual filename: Elgar Manual v4.4x.doc
English version
•
Digitally implemented, 0 to –60dB in 0.5dB steps
•
Digitally implemented, 0 to –40dB in variable steps, each side.
•
Mutes one channel at minimum settings.
•
Auto-selected, 50/15µs, CCITT J17 or none, available at 32, 44.1 or 48kS/s.
Type
Source impedance
(20Hz-20kHz)
Maximum load
Noise, unweighted
(20Hz-20kHz)
Spurious responses
(20Hz-20kHz)
Signal balance @ 1kHz
L-R crosstalk,
(20Hz-20kHz)
Level for full scale
(set by the switch)
Level
Connectors
Connections
Table 6 – Analogue Output Electrical Characteristics
The sample clock quality significantly determines the output performance of the
converter. The highest quality clocks that are available are crystals, so we use
these. Elgar Plus uses two on-board voltage controlled crystal oscillators
(VCXO's) as clock sources - one for the 44.1kS/s related outputs and one for
the 48kS/s related outputs.
Only one VCXO is active at a time. In slave mode, the active VCXO is
synchronised to the clock signal extracted from the input by a phase locked loop
(PLL). This PLL is of a special narrow bandwidth type, that provides a
significant degree of "clock cleaning". The PLL is also very robust, and will lock
to very poor signals if necessary. Data is decoded using a much wider band
(faster) PLL, so AES3 type low frequency jitter on the input clock can be
handled, and will be cleaned.
Pull-in range
Lock-in time
Balanced
Balanced,
semi-floating
< 3
600
< -110
< -100
> 40
< -80
6 or 2
XLR male (2)
+Signal on pin 2
-Signal on pin 3
x
± 300 ppm about nominal frequency
< 6 seconds for most situations
Page 46
Manual for Software Issue 4.3x
August 2005
Unbalanced
Single ended,
ground referred
Ω
52
Ω
600
< -110 dB0
< -100 dB0
- dB
< -80 dB
6 or 2 V rms
RCA Phono (2)
-
email: more@dcsltd.co.uk
web-site: www.dcsltd.co.uk