![]() ![]() ![]() There's already an analog TV demodulator for SDRs - it's a plugin for SDR# called TVSharp. And sure enough, when the NES RF channel selector is at position "3", a strong signal indeed appears on VHF television channel 3, at around 55 MHz. I happen to have an Airspy R2 SDR receiver that can listen to VHF and take 10 million samples per second - could it be possible? I made a cable that can take the signal from the NES RCA connector to the Airspy SMA connector. I got rid of this by setting the camera on manual focus and defocusing the lense just a bit. ![]() This is due to intererence between two regular 2D arrays, the shadow mask in the TV and the CCD array in the camera. ![]() The camera will miss every other frame of the original 50 fps video, but on the other hand, will get an evenly lit screen every time.Ī Moiré pattern will also appear if the camera is focused on the CRT shadow mask. This is why I used a DSLR camera with a full manual mode (Canon EOS 550D in this case).įor the 50 Hz PAL television screen I used a camera frame rate of 25 fps and an exposure time of 1/50 seconds (set by camera limitations). This posed interesting problems: The camera must be timed appropriately so that a full scan is captured in every frame, to prevent temporal aliasing (stripes). The cathode-ray tube television that I use for gaming could be filmed with a digital camera. Even when they do work, a downside to many cheap capture devices is that they can only capture at half the true framerate (that is, at 25 or 30 fps). ![]()
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