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Checking waveforms

A project log for 32 Shades of Grey

Portable NTSC test pattern generator

danjovicdanjovic 05/03/2018 at 01:220 Comments

First captured waveforms showed good results. It seems that everything is OK with the code.

The vertical retrace interval seems to be OK, with the Horizontal Equalization lines as well as the vertical serration.

Vertical Sync Interval
Vertical Sync Interval
Serration Pulses
Serration Pulses

The video content contains alongside with the grayscale a series of (black and white) line pairs with progressive spacing so it is possible to estimate the vertical resolution of the monitor. The thinnest pair of lines is only one clock cycle apart which means an equivalent resolution of about 800 pixels.

Horizontal resolution test content (line pairs)
Detail of the resolution test content

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