Looking to put together a small device that produces a standard analog (NTSC) composite video output signal of an image stored as a high resolution .jpg or other format (from an SD card or whatever). Bar/Dot/Crosshatch/SMPTE bar generators are easy to buy as commercial gear, but what I want is to produce the old-time “Indian Head” RCA monochrome test pattern from the early days of TV. Looking for a functional replacement for a 40s era RCA TK-1 monoscope pattern generator as seen here:
http://www.pharis-video.com/p2794.htm
Looking for the simplest/cheapest embedded platform and graphics card that can quickly boot up and output a single fixed video image. Need old time composite analog video output, not HDMI, VGA, etc. Not crucial but on the wish list would be also generating an audio tone, and the ability to optionally output a video signal appropriate to the vintage of the displayed test pattern. That means no colorburst or chrominance signals and scan rates at the original 15.75 Khz/ 30 Hz rather than the later NTSC color standard of 15.734 and 29.97. Imagining something like a Raspberry Pi with an SD reader and some kind of media player software? Any ideas?