Hi, I am currently investigating the TED analog signals which might be close to the C64. How do you turn off a comb filter? Is this filter in the RF modulator? As I can see TED uses the same saturation for all hues. Even the burst signal amplitude is the same as the actual color signal. I believe they made it quite simple. Btw does anyone know whether the NTSC color phases in the 264 system specification are reliable? I don't have NTSC monitor/motherboard to test it. Thanks Istvan On Sun, Jun 7, 2020 at 4:52 PM Michiel Boland <michiel_at_boland.org> wrote: > Hi. I noticed that if you capture analog C64 video with the comb filter > turned > off there is quite a difference in color saturation and/or hue between > even and > odd lines. > > I thought that the colors were generated by adding a weighted sum of sine > and > cosine signals, but inverting one of the inputs (which is done in odd > lines in > PAL systems) should not have any effect of the overall amplitute, unless I > am > very much mistaken. > > Has any more research been done into this? > > Cheers > Michiel > > FWIW I have taken some measurements here: > http://www.michiel.boland.org/c64_colors.html > >Received on 2020-06-08 12:00:02
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