[opendtv] Re: Getting From 59.94 to 60
- From: "Stessen, Jeroen" <jeroen.stessen@xxxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 11 Apr 2011 13:54:13 +0200
Hello,
Mark Schubin wrote:
Ø It's convenient, but it's not strictly necessary.
(...)
Ø The TVs had no trouble switching between 25.00 and 29.97 frames,
Ø let alone between 29.97 and 30.00, and ALL of them used RF inputs.
The issue is not whether the TVs would sync on 60.00 versus 59.94 Hz,
the issue is whether the visible amount of cross-color and cross-luma
would be acceptable. Assuming that neither the color carrier nor the
audio carrier _can_ be moved from their standard values, then if ATSC
changes the line frequency then (a lot) more crosstalk will be visible.
It's also quite likely that the comb filters that could repair that will stop
working. (But a TV good enough to have comb filters would also have
better inputs that don't need comb filters.) A cheap converter box
must work also with a RF connection (luma + chroma + audio over a
single cable) to an antique NTSC TV. So, that's why you have 59.94.
Because you don't want to have to answer the phone on millions of
angry viewers. It's just a minor numerical inconvenience to you...
Groeten,
-- Jeroen
Jeroen H. Stessen
Specialist Picture Quality
Philips Consumer Lifestyle
High Impact Innovation Center
High Tech Campus 37 - Office 8.042
NL 5656 AE Eindhoven - Nederland
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