In SX Microcontrollers, SX/B Compiler and SX-Key Tool, James Newton wrote:

Forgot to mention:

http://www.piclist.com/techref/microchip/fft/picspect.htm PIC'Spectrum: A spectrum analyser with bit banged video display. Done with a PIC.

You know... If you turn the TV on its side, and each O-Scope value is loaded, at the start of each video line, into a count down timer which then produces a "blip" of white video when it expires...

Then you just normalize all your samples into 262 points or two sets of 262 (even then odd). So if you capture 4096 points in ram you can see the parts of that in a 262 or 524 point window with the starting point controlled by the horizontal offset control. If you capture at 75Mhz, or 1Hz, the display is the same: Really simple.

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