ASD24 Reference Generator
4
SOURCE:
INTERNAL: The unit runs on the internal oven crystal clock oscillator.
44.1 kHz to 10 MHz (see list below) : Enabling external synchronization at the selected frequency.
CLOCK OUT:
44.1 kHz to 6.144 MHz (see list below): It shows the selected word clock output frequency. It also shows the sampling
frequency for AES and SPDIF outputs. However, the sampling frequency for AES and SPDIF is limited to a maximum of
192 kHz. (see details in the list below.
VIDEO OUTPUT:
SD and HD Video formats (see list below): It shows the selected video format.
STATUS:
Shows the status of the unit: When the unit runs on INTERNAL, the status is shown as LOCK. When a change of video
format or clock frequency is made, the unit will briefly display WAIT until all phase locked loops have settled. Typically this
will last for less than 1 second.
When any external sync is selected (44.1 etc.) and no input sync is present at the BNC connector at the back, the unit will
display - - - - to indicate that no external sync is present. When the incoming sync is at a valid frequency, the unit will
perform a phase lock and display LOCK.
OBS: When the incoming sync is invalid, for example if it is at a different frequency than the SOURCE setting, the unit will
not lock, and the display will show ERROR.
There is a hidden setting in the STATUS position (the only one in the unit): Press the menu button until the arrows cursor
is at the STATUS position, and then press the up- or down arrow. You will then be presented with the choice TS OFF or
TS ON. This setting controls the Test Signal embedded in the video output: Color bar for PAL and NTSC formats, hatch
pattern (grid) for all other formats.
This feature is meant as a test tool for tracking down problems in installations. It is irrelevant for synchronization purposes.
Sync references (SOURCE on the front display)
1. INTERNAL internal oven crystal oscillator
2. 44.1 kHz standard audio sampling frequency
3. 48 kHz standard audio sampling frequency
4. 88.2 kHz standard audio sampling frequency
5. 96 kHz standard audio sampling frequency
6. 176.4 kHz standard audio sampling frequency
7. 192 kHz standard audio sampling frequency
8. 352.8 kHz audio sampling frequency from future audio equipment
9. 384 kHz audio sampling frequency from future audio equipment
10. 705.6 kHz audio sampling frequency from future audio equipment
11. 768 kHz audio sampling frequency from future audio equipment
12. 1.544 MHz clock from T1 Telecom systems
13. 2.048 MHz clock from E1 Telecom systems
14. 10 MHz clock from GPS receivers, rubidium oscillators, cesium oscillators (aka atomic clocks)
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