[QuadList] DVD vs Blu-Ray

[Steve White]

Mike,

Thanks.  After sending that observation, I checked online.  Hz became 
official in 1960, with the formation of the International System of 
Units, but it sure was a long time before anyone I knew was referring to 
kilohertz instead of kilocycles.

Steve



On 12/24/13 11:31 AM, Mike wrote:
> Steve,
>
> That's right!  When was it, 60s or early 70s when we switched from cps 
> to Hz?
>
> -mike
>
> Steve White <Steve.White at 800CallNow.com> wrote:
> James,
>
> Thanks very much for the details.
>
> I'm certain the DVD originated as 16:9 and probably as HD because I've 
> seen a reference to the fact that they were recording for release in 
> both Blu-Ray and DVD.  I saw the show when it aired live on CBS a 
> couple of weeks ago in some flavor of high definition.
>
> I'm always impressed by the knowledge this group possesses, but 
> suppose this is what you guys do, after all.  I managed to keep an RCA 
> CT-100 alive for several years in the early to mid-60s using 
> components from the same chassis incarnated as a Conrac monitor.  The 
> two cost me $75.00 and provided some serious fun and challenges...not 
> the least of which was moving them from DC to Fitchburg, Mass and then 
> to Charlotte, NC.  Can't believe I didn't find a way to hold on to them.
>
> I suppose I can claim partial credit for my recollections from those 
> days regarding the color subcarrier?  To put a VERY fine point on 
> things, were we using the term hertz/Hz when stating a frequency back 
> then, or did that term work its way into common use sometime later?
>
> Regards,
> Steve
>
>
> On 12/23/13 1:24 PM, James Snyder wrote:
>> Steve,
>>
>> Strictly speaking, no DVD can be "NTSC" since NTSC was the 525 line 
>> analog television standard and DVDs are, by their nature, digital TV 
>> delivery media in the 480 line format in the former "NTSC" countries 
>> (using MPEG-2 video compression), and 576 format in the former PAL & 
>> SECAM countries.  However, "NTSC" has become a colloquialism for "480 
>> line video" and is thus misused constantly.
>>
>> The difference between NTSC and 480 being that, since digital signals 
>> don't need horizontal or vertical blanking intervals, the extra lines 
>> used for those timing signals for analog CRTs are not included in 
>> digital video.  There were 45 lines of blanking in NTSC.  Same with 
>> 576:  the H and V blanking lines in 625 line video aren't needed in 
>> digital TV and are thus not included in the digital signals.
>>
>> DVDs have the ability to reproduce 16:9 (1.78:1) aspect ratio video, 
>> so if the people on your Garth Brooks DVD don't look squished, most 
>> likely the video was orginated in 16:9 480 line digital video.  I 
>> can't imagine anybody creating anything in actual NTSC analog today. 
>> It would look like crap with all the analog artifacts.
>>
>> Hope this helps,
>>
>> James
>> ------------------------------------------------
>> James Snyder
>> Senior Systems Administrator
>> Library of Congress -
>>   National Audio Visual Conservation Center (NAVCC)
>> Motion Picture, Broadcasting & Recorded Sound Division (MBRS)
>> Packard Campus for Audio Visual Conservation
>> http://www.loc.gov/avconservation/packard/
>>
>>
>>
>>> Thanks for the opportunity to ask, can someone help me get a better 
>>> grasp of DVD vs Blu-Ray formats?
>>>
>>> I recently received a video disc labeled as an NTSC DVD of the Garth 
>>> Brooks "Blame It All On My Roots" performance in Las Vegas. Playback 
>>> on my Blu-Ray deck displays as full screen on a new Panasonic plasma 
>>> screen capable of 1080p without obvious aspect ratio distortions.
>>>
>>> Garth's performance is incredible; lighting, camera work, audio, 
>>> direction all are great.  Apparently, there is currently no Blu-Ray 
>>> disc available.
>>>
>>> - Is it technically correct to label the DVD as NTSC when the image 
>>> displayed is 16:9?
>>>
>>> - What's the likely resolution/format?  Any suggestions on how I 
>>> could have confirmed that without asking you?
>>>
>>> Many thanks,
>>> Steve
>>>
>>>
>

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