GUIDE TO INSTALLATION AND OPERATION
26
| HCO-1822
Clean Switch Option
– allows the HCO-1822 to make a glitch-free switch between its two inputs under certain
circumstances:
1.
The two inputs MUST have the same format.
2.
An external reference or URS is recommended to
run the CSO. In this mode, the reference presence
is always reported, regardless of the user’s setting.
3.
The CSO allows us to do a clean video switch
between two synchronized sources. For timing
requirements between the video sources and the
reference source, refer to the Genlock section.
Switching is executed on the proper vertical
blanking interval video line according to the format
of the reference source. (refer to SMPTE RP 168-
2002: Switching point for synchronous video switching) .
4.
The switch is free of any glitches, assuming the
switch is not due to loss of video or CRC errors
and format or reference mismatch are detected.
5.
During a switch, the CSO performs a fade out/fade
in audio switch on 200 samples to prevent any
pops or clicks (only applicable to PCM audio)
6.
The following parameters and functions are not
supported without the CSO.
•
Timing measurements.
•
Output timing adjustment.
•
Glitch-free switching.
•
Reclocked outputs.
7.
If there are no errors on input 1 but a reference
mismatch is detected on input 2, the CSO keeps
working.
The Options panel gives some information about obtaining
the Clean Switch option, and provides a data entry box
“Enter Key” where the activation key supplied when the
option is purchased can be entered.
•
Enter the Key in the data box, and click the
Enable
Option
button to activate the Clean Switch feature.
Supported input signals
Reference
525 (SMPTE-259M-C)
NTSC (SMPTE-170M)
625 (SMPTE-259M-C)
PAL (ITU 624-4)
1080i50 (SMPTE-274M)
1080i50, PAL
1080i59.94 (SMPTE-274M)
1080i59.94, NTSC
720p50 (SMPTE-296M)
720p50, PAL
720p59.94 (SMPTE-296M)
720p59.94, NTSC
ASI (EN50083-9)
-------
Figure 3.33 Options Panel – Clean Switch Option
