[opendtv] Re: News: CEA FORECASTS CONSUMER ELECTRONICS REVENUE WILL SURPASS $155 BILLION IN 2007
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 11 Jan 2007 12:15:48 -0800
Nitpicking: why use 30 fps as the frame rate (non-existent) instead of
29.97, then compare it to 24.976. Either its 30/24 or 29.97/23.976.
Only matters less than a mb/sec, but you said 31.1, so its outside of your
stated accuracy.
John Willkie
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]
> On Behalf Of Manfredi, Albert E
> Sent: Thursday, January 11, 2007 11:33 AM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: News: CEA FORECASTS CONSUMER ELECTRONICS REVENUE
> WILL SURPASS $155 BILLION IN 2007
>
> Dale Kelly wrote:
>
> > Thanks. To summarize our NTSC/PAL discussion:
> >
> > There is little qualitative difference between the
> > NTSC and PAL color transmission systems; the perceived
> > differences are simply related to implementation
> > rather than to system capabilities. I.E;
> >
> > If, in the U.S., the power line frequency was 50Hz
> > rather than 60 Hz, the channel bandwidth was 8 MHz
> > rather than 6 MHz and the TV set manufacturers
> > actually passed all color information contained in
> > the NTSC transmission, there would be very little
> > difference between the image quality of the two
> > systems.
> >
> > Conversely, if England began broadcasting NTSC
> > tomorrow, assuming TV set design was correct, there
> > would again very little difference in displayed image
> > - assuming post 1970 receiver design is used.
> > Question, how long has it been since you NTSC users
> > adjusted a hue control (which is now buried in a
> > menu)?
>
> The other topic was a comparison between PAL, specifically the UK
> variety, and HDTV. The assertion being that there wasn't much
> difference.
>
> When all else fails, use math. The UK version of PAL, PAL-I, supports a
> video bandwidth 5.5 MHz. The best PAL out there, PAL-D, supports 6.0 MHz
> video bandwidth. Both of these are close to what NTSC can do with DVDs,
> using the baseband video outputs. So that is (should be) what they are
> most comparable to.
>
> Other versions of PAL are 5.0 MHz or 4.2 MHz, the latter identical to
> NTSC in a 6 MHz channel.
>
> But HDTV is considerably sharper than any of these. Whether or not
> actual receivers can make complete use of what's available, HDTV video
> bandwidths are out in the 20-30 MHz region.
>
> 1080 at 60i or 1080 at 30p is 960 cycles/line * 1080 lines/frame * 30
> frames/sec = 31.1 MHz.
>
> 720 at 60p is 640 cycles/line * 720 lines/frame * 60 frames/sec = 27.6
> MHz.
>
> I submit, a major difference between any analog scheme and HDTV.
>
> Bert
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