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FERNSEH · 27th May 2006, 12:16 pm

I've found the information of the Baird 240 line system.

The sync pulses are actually 40% of the video waveform.

The frame broad pulse duration is 12 lines. The frame blanking period is 20 lines. Therefore, the frame pulse is 2milliseconds and the frame blanking is 3.333milliseconds.

The line pulse width is 8% of the 166.6 microsecond line period = 13.33 microseconds. The line blanking is 10% of the line period = 16.6 microseconds. The is no front porch. The leading edges of the line pulse and blanking are coincident.
It's the same for the frame blanking and sync.

DFWB.

27th May 2006, 12:16 pm	#6
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Baird 240 line standard details wanted I've found the information of the Baird 240 line system. The sync pulses are actually 40% of the video waveform. The frame broad pulse duration is 12 lines. The frame blanking period is 20 lines. Therefore, the frame pulse is 2milliseconds and the frame blanking is 3.333milliseconds. The line pulse width is 8% of the 166.6 microsecond line period = 13.33 microseconds. The line blanking is 10% of the line period = 16.6 microseconds. The is no front porch. The leading edges of the line pulse and blanking are coincident. It's the same for the frame blanking and sync. DFWB.