6
Redbox User Handbook No 1
DIGIT
AL A
UDIO C
ONVERTERS - RB
-ADD
A
DIGITAL AUDIO CONVERTERS
DIGITAL AUDIO CON-
VERTERS
In
Slave Sync Mode
, switch position D, the digital output sample rate follows the digital
input. When the digital input signal is not present the digital output is turned off.
The following table, also printed on the top of the unit, summarises the above settings
and shows the sample rate generated by the internal clock generator in master and auto
sync modes.
Frequencies and Sync Modes
Rotary
Switch
Number
Mode
Sample
Frequency
(kHz)
0
Master
32
1
Master
44.1
2
Master
48
3
Master
64
4
Master
88.2
5
Master
96
6
Auto
32
7
Auto
44.1
8
Auto
48
9
Auto
64
A
Auto
88.2
B
Auto
96
C
Auto Lock
-
D
Slave
-
Fig 1-6: RB-ADDA Frequency and Sync Rotary Switch
Test/Calibration Mode
For optimum performance of the RB-ADDA, the unit should be calibrated when it has been
powered up for approximately 10-15 minutes. The circuitry and chipsets contained in the
unit will warm up during this time and the performance will deteriorate unless calibrated
(the noise floor and dynamic range will be 1-2dB down on their best). The calibration cycle
calibrates the gain and the zero reference of the A/D converter.
To calibrate the RB-ADDA, set the rotary FREQUENCIES AND SYNC MODES switch to position
“F”. The power LED on the front panel will flash quickly for 2 – 3 seconds and will illuminate
fully when the unit is calibrated. Once calibration is complete, reset the rotary switch to the
position that you require.
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