Manual

Chapter 8 - RB-DMA2 Dual Digital Microphone Amplifier
8-2 Redbox User Handbook
Auto Lock Mode - This operates like the auto mode except that if no sync-input
signal is detected, it will use the internal master clock to sync to the sample rate
which was last clocked to. When operating in sync modes, the front panel power LED
flashes whenever the unit is not synchronised to the incoming digital signal, or when
the unit is being calibrated. The unit should be calibrated once it has been powered up
for more than 10 minutes.
For the digital output, there is a switch available to define the content of the channel
status bits embedded within the digital audio stream. The channel status bits will be
forced to Professional Mode for sample rates above 48kHz, as they are not supported
by the Consumer Mode. For sample rates of 32kHz, 44.1kHz and 48kHz, the status
bits can be either set to Professional or Consumer Mode.
The bit depth of the digital output can be set to 16, 20 or 24 bits, with a psycho
acoustic noise filter used to dither signals below 24 bit.
8.2. System Block Diagram
AES
Receiver
Balanced
Mic Inputs
Digital Sync
Select
AES/EBU
S/PDIF
Word
Clock
Master Clock
Generator
Frequency
Select
Reco vered
Clock
48V Phantom
Power
Digital
Send Select
A
ES
Transmitter
ADC
LF Filter
LF Filter
Gain Control
AES/EBU
S/PDIF
Gain Control
1
2
1
2
Digital Sync Inputs
XLR
Balanced
Line Outputs
Fig 8-2: RB-DMA2 System Block Diagram