Manual

Chapter 4 - RB-ADDA Combined A/D and D/A Converter
Redbox User Handbook 4-5
4.4.3. Rear Panel Controls
4.4.3.1. Full Scale dB Settings
The full-scale dB settings can be set for signals of +12, +18, +24 dBu to give full-
scale digits in the digital domain.
Fig 4-4: RB-ADDA Full Scale dB Settings
4.4.3.2. Status Select Switches
These switches are used to determine the status or content of the digital signals. The
type of information encoded in the channel status bits of a digital audio signal can be
professional or consumer and is determined by switch 1. However at bit rates higher
than 48kHz, consumer mode is not available, so professional mode is used and this
switch will be ignored.
If de-emphasis is selected (switch 2) the RB-ADDA will decode 50/15µs emphasis
when indicated by certain channel status bits in the incoming digital audio data.
The sample size for the analog to digital conversion can be set to 24, 20 or 16 bits
(switch 3 & 4). When the signal is truncated from 24 bits, a psycho-acoustic filter is
applied to maintain optimum signal quality. These settings are summarised by the
table in Fig 4-5, which is also shown on the top panel of the unit.
Fig 4-5: RB-ADDA Status Select Switches