3 ms·
This is basically correct but the I and Q signals need to be filtered much more drastically (down to a bandwidth of about 1.5 mhz) to avoid artifacts, and more
by grapeshot 11y ago
This is basically correct but the I and Q signals need to be filtered much more drastically (down to a bandwidth of about 1.5 mhz) to avoid artifacts, and more luma detail can be obtained by using a comb filter (summing adjacent lines to cancel the color signal since the phase on each line is shifted by 180 degrees from the previous).
- ajenner 11y agoThis is true for proper standards-compliant NTSC signals, but a comb filter won't help you for CGA since the CGA card generates an integer number of color carrier cycles per scanline (228, not 227.5). So the phase isn't reversed each line and there's no way to get any extra detail.