True dat.
My wife is CONSTANTLY watching the SD signals on our HD set because the channel numbers are easier to remember (the ones she grew up with).
Furthermore, you need to understand the concept of a "VALID" signal instead of just a "LEGAL" signal. A legal signal is legal in its current form/color space. But a "VALID" signal is a signal that is ALSO legal when it is CONVERTED to some other color space. The usual issue with LEGAL AND INVALID signals is gamut errors that you don't see unless they're converted first. Tek has a bunch of specialized displays that allow you to check both at the same time. Using most other scopes you have to have TWO sets of scopes AND an HD to analog converter so you can look at the HD THEN the HD-converted-to-SD. This is a pain AND expensive.
Disclaimer: I am occasionally paid by Tektronix to represent them (as I was at Editor's Lounge), but not now.
Steve Hullfish
contributor: www.provideocoalition.com
author: "The Art and Technique of Digital Color Correction"
On Jul 2, 2012, at 10:14 PM, johnrobmoore wrote:
> Along those lines at the Incredibly Awesome Editor's Lounge with Tektronix engineer Steve Holmes and Mr. Hullfish it was pointed out at the scope presentation that even if you deliver 100% HD shows 80% of the viewers are still watching NTSC. Either through the Sat or Cable provider or with DTV converter boxes. It was also pointed out that usually to save Satellite space everything is uplinked HD and then the Cable Head ends etc.... commonly use I.R.D.s (Intergrated Receiver Decoders) that do the downconvert to SD and Mpeg and or H.264 that have absolutely no controls for the Head Ends to adjust anything. This was tied to the importance of still keeping the SD downconvert and composite conversions legal within the HD signal. Even with video and audio outputs on the set top boxes it is astonishing how many still view on ch. 3/4 through the RF modulator output.
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