Bring NTSC receiver to UK

Posted by Allan on September 29, 1998 at 12:41:10:

In Reply to: Bring NTSC receiver to UK posted by Steve on September 28, 1998 at 10:53:07:

Suggest that you have a chance to view the picture and verify the quality before buying NTSC to SECAM (or similar) converters, or multi-standard TV's, VCR's, etc.

When buying a multi-standard TV, be sure it actually displays each standard as opposed to convert everything to one standard.

It appears that converting from one standard to another should be done only as a last resort, better to purchase equipment that will play each standard you want to view.

If the output of a standards converter is S-video (NTSC, PAL, SECAM each has its own non-interchangeable version) and you don't go back to composite, you will likely get a much better picture.

Is the following really true?

Analysis of the NTSC to PAL/SECAM (and vice versa) conversion suggests there must be a lot of picture quality loss.

(1) A double dose of dot crawl from having to comb filter the signal twice, Y/C separation is needed during the conversion process and also done in the TV set, or loss of horizontal resolution if the converter uses a notch filter instead.

(2) Distortion caused by interpolation, adding lines, or dropping lines during converting to a different number of scan lines,

(3) Distortion and/or vertical resolution loss from even-odd field role switching as fields are added or deleted in the 25/30 frame per second conversion, or jerky motion if whole frames are so added or deleted.

Additions, corrections, comments wanted; the web page referred to below will be corrected quickly.

• NTSC-PAL and similar conversion problem(?)

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