Quote:
Originally Posted by old_tv_nut
In the case of the B&K, the transparency was as big as the CRT face and was held close to it, eliminating the need for a lens at that point. In the EVR player, there was a 3-inch CRT and a lens to scan the tiny film frames - it was like a low power flying spot microscope. Nevertheless, it could produce full 4 MHz bandwidth luminance.
The recording and playback of the color subcarrier was on a separate film frame next to the lumininance and was much more complex electronically (but used identical optics). It involved recording a sine wave brightness pattern of color subcarrier at 1.8 MHz (one half NTSC subcarrier frequency, making vertical stripes of varying phase and amplitude), with an added constant amplitude and phase pilot carrier stripe pattern at 900 kHz. The resulting recovered chroma bandwidth was +/- 600 kHz, better than any consumer VCR.
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I figured there was a lense, pretty sure my slide theater has one as well, but didn't want to overcomplicate the basic concept explaining a flying spot scanner.
The color specs of the system are quite interesting.
11-08-2023, 01:50 PM
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