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Originally Posted by ChrisW6ATV
Most people have said it is/was about equal to VHS, which would be 240 lines.
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I used to work for RCA at the Smirnoff Labs back in the CED days, and we knew the resolution was almost 3MHz, vs VHS was about 2MHz. So CED would be about 300 lines. Which means CED was somewhat sharper.
The color subcarrier on the discs was around 1.5MHz, and the players used a 5.11 MHz crystal to upconvert it to the standard 3.58MHz NTSC color subcarrier. There was a phased lock loop sort of circuit to vary the 5.11 MHz oscillator to compensate for wow and flutter of the disc turntable to keep the output a consistent 3.58MHz. The error signal I think was also used to push or pull the needle in a direction parallel to the grooves in the neighborhood, as a way to counteract the wow and flutter. The players used a comb filter set to the 1.5MHz subcarrier freq to separate it from the luma signal. Otherwise, a notch filter would wipe out all the sharpness of the video, making it worse than VHS.
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Biggest problem I had w/the damthing was the "Skipping"... Even with a brand-new, out of the cellophane movie, it was subject to that.
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That was because of impurities in the plastic used to make the discs. They never did solve it.