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Frequency and Sync Mode
This rotary switch selects the Synchronisation Mode and the frequency of the
digital output when using the on-board clock generator. There are 4 modes of
operation:
■
Master Sync Mode (Switch positions 0–5)
The digital output sample rate is set by and locked to the internal clock
generator. No sync signal is used.
■
Auto Sync Mode (Switch positions 6–B)
The digital output sample rate follows the digital input. When a digital
input signal is not present, the output sample rate is set by and locked to
the internal clock generator at the frequency determined by the switch
position.
■
Auto-Lock Sync Mode (Switch position C)
No output is generated until lock with a digital input signal is achieved.
The digital output sample rate then 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 frequency closest to
the previous digital input.
■
Slave Sync Mode (Switch position D)
The digital output sample rate follows the digital input. When a digital
input signal is not present the digital output is turned off.
The following table summarises this. It shows the sample rate generated by the
internal clock in Master and Auto Sync modes.
Test/Calibration Mode
The calibration cycle calibrates the gain and the zero reference of the A/D
converter. For optimum performance, the ADA should be calibrated after you
change the Gain settings, ideally after a 10-15 minute settling period.
To calibrate the unit, 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.
Rear Panel Controls
Status Select Switches
These switches determine the channel status of the digital signals. The channel
status bits of the digital audio signal can be Professional or Consumer, as
determined by switch 1.
Note: At sample rates higher than 48kHz, Consumer mode is not available, so
Professional mode is used and this switch is ignored.
If de-emphasis is selected (switch 2) the ADA will decode 50/15µs emphasis
when the incoming channel status indicates that this is appropriate.
The wordlength for the A/D conversion can be set to 24, 20 or 16 bits (switches 3
and 4). When the signal is truncated from 24 bits, a psychoacoustic filter is
applied to maintain optimum signal quality. These settings are summarised by the
following tables:
Note: All current CEDAR digital processors are 24-bit, so we advise you to leave
the wordlength at 24 bits.
Digital Select Buttons
These buttons allow you to switch between AES/EBU (button out) and SPDIF
(button in) for each of the digital input and output.
Analogue Select Button
This button switches the analogue input between the balanced (button out) and
the unbalanced (button in) connectors.
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