Manual

Chapter 4 - RB-ADDA Combined A/D and D/A Converter
4-6 Redbox User Handbook
4.4.3.3. Digital Select Buttons
These buttons are used to switch the digital connection between the AES/EBU XLR
connector (button out) and the S/PDIF phono connector (button in) for the digital
input and the digital output.
4.4.3.4. Analogue Select Button
This button is used to switch the Analogue input between the balanced XLR connector
(button out) and the unbalanced phono connector (button in).
4.4.3.5. Frequency and Sync Mode Rotary Switch
This rotary switch is used to select the Synchronisation Mode and to select the
frequency of the digital output when using the on-board clock generator. There are 4
modes of operation: - Master Mode, Auto Sync Mode, Auto Lock Sync Mode & Slave
Mode.
• In Master Sync Mode, switch positions 0 – 5, the digital output sample rate is
simply set by, and locked to, the internal on-board clock generator. No sync
signal is used or required.
• In Auto Sync Mode, switch positions 6– B, the digital output sample rate follows
the digital input. When the digital input signal is not present the output sample
rate will be set by, and locked to, the internal on-board clock generator at a
frequency determined by the switch position.
• In Auto-Lock Sync Mode, switch position C, No output will be generated until
lock is achieved with a digital input signal. The digital output sample rate now
follows the digital input. If the digital input signal is removed then the output
sample rate will be set by, and locked to, the internal on-board clock generator at
the closest frequency available to the previous digital input.
• 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.
Fig 4-6: RB-ADDA Frequency and Sync Rotary Switch
Selections
kHz
32 44.1 48 64 88.2 96
MASTER 0 1 2 3 4 5
AUTO 6 7 8 9 A B
AUTO LOCK = C
FREQUENCIES AND SYNC MODES
SLAVEMODE=D