Network Electronics ADC-SDI User Manual page 13

ADC-SDI
5.2.5 Switch 6 & 7
These two switches determine which Luma / Chroma separation filter that are in selected,
according to Table 5. The factory settings are switch 6 set to on and switch 7 set to off.
Switch #
6 7
Default adaptive 3-line comb filter selection.
0 0 NTSC adaptive comb with filter coefficients (¼, ½, ¼)
PAL adaptive comb with filter coefficients (½, 0, ½)
Adaptive 3-line comb filter selection with optional filter coefficients
1 0 NTSC adaptive comb with filter coefficients (½, 0, ½)
PAL adaptive comb with filter coefficients (¼, ½, ¼)
0 1 Fixed 2-line comb filter
No comb filter
1 1 Luma filtered with chroma trap
Chroma low pass filtered
5.2.6 Switch 8 - Reset to factory default
ADC-SDI contains EEPROM that is affected by your choices. Switch 8 is implemented to
reset the EEPROM to factory default. Its use is shown in Table 5.
Action
Power down
Turn switch 8 on
Power up
Power down
Turn switch 8 off
Power up
Table 5: A method to restore the ADC-SDI card to the factory settings. Remember to let some
seconds pass by each time you power down, to allow capacitors to be fully discharged.
5.2.7 Switch 9 –Chroma Blanking for Teletext
Switch 9 is enabling Chroma Blanking within the vertical blanking area. When on, the chroma
information in lines 1-23 / 313-335 (PAL) or 1-21 / 263-284 (NTSC) will be erased (replaced
with 0x200). This is an important setting when using ADC-SDI with teletext information in line
23 (like for PAL+). When switch 9 is off, the vertical blanking area will be optimised for video
information.
When using ADC-SDI with S-Video (Y/C), it is recommended to leave switch 9 in off position
Factory setting is switch 9 in off position.
5.2.8 Switch 10 - Programming mode
Switch 10 is purely used for service upgrade of the ADC-SDI card. It should always be in the
on position. If switch 10 is in the off position, the CardState LED will light up red, and the
ADC-SDI card will enter programming mode. This causes no harm, but the card will not work
in this mode.
Factory setting is switch 10 in on position.
Table 4: Luma / Chroma separation filter.
ADC-SDI enters a special state where the EEPROM is restored to
factory default values. This is flagged by the LEDs, they are all yellow.
If you want the DIP switches to be placed in the factory default
position, this is the time to do so: Turn switches 1 through 9 to the off
position. Switch 10 should, as always, be turned to the on position.
The card EEPROM is now reset to factory settings.
Function description
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