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From: mm on 21 May 2010 14:46
On Thu, 20 May 2010 11:48:59 -0700, UCLAN <nomail(a)thanks.org> wrote:

>mm wrote:
>
>> Does there exist the opposite of an RF Modulator? Something that will
>> take RF and turn it into digital for a digital tv?
>
>Well, a RF *demodulator* takes analog RF and converts it to analog A/V. A
>A->D converter will convert that to digital.
>
>> Can I convert the analog back to digital for the digital tvs?
>
>A A->D converter will do the trick. $$ for video.
>
>Question: For the digital TVs, why not just use the original digital
>signal?

I don't know. I guess I can. I didnt' think of it. Thanks.

I guess I would have to use a couple spitters to make a route around
the RF modulator, and then I would be running analog and digital on
the same co-ax, right?


From: mm on 21 May 2010 14:48
On Thu, 20 May 2010 08:05:04 -0400, Rich Webb
<bbew.ar(a)mapson.nozirev.ten> wrote:

>On Thu, 20 May 2010 01:19:04 -0400, mm <NOPSAMmm2005(a)bigfoot.com> wrote:
>
>[snippety snip]
>>So what will I do when I have one or two digital tvs, but I'm sending
>>analog to all the tvs?
>
>Some (many? most? all?) current generation U.S. flat-screen television
>receivers include both NTST (analog) and ATSC (digital) tuners. The NTSC
>tuners work the same way on the flat-screens as they do for the older,
>CRC-based models, so you may not need to make any changes to your
>distribution system at all.

Well that would be great. I'll keep my eyes open for that.

>>Can I convert the analog back to digital for the digital tvs?
>
>Not easily or cheaply. The consumer-grade market for such a gizmo is
>very small. If you wanted to do the heavy lifting, the specs for each
>are available and it certainly could be done in principle. Some guy with
>a web page has probably already done it but you're not likely to find
>one on the shelf at WalMart.

Okay.

Thanks to you and to Bob, AZ, David, William (even though he thinks
I'm trolling!) Jim, David, Michael, and UCLAN.
From: William Sommerwerck on 21 May 2010 15:19
> Thanks to you and to Bob, AZ, David, William (even though
> he thinks I'm trolling!) Jim, David, Michael, and UCLAN.

There are some questions that -- to me, anyway -- have such obvious and
simple answers, that it's easy to believe some posts are trolls.


From: Jeroni Paul on 21 May 2010 16:15
On 20 Maig, 07:19, mm <NOPSAMmm2...(a)bigfoot.com> wrote:
> Can I convert the analog back to digital for the digital tvs?

Not easy, a quality real time MPEG coder takes a lot of computing
power and the mass market does not request such device, so for now it
is expensive. However I'm guessing you are thinking for the future
when TVs are no longer equipped with analog tuners. At least a
baseband video input is likely to be available in TVs for a long time
so an easy option would be an external analog tuner. Yes, they exist
and even have remote control just like digital tuners.

However chances are that MPEG coders and CODFM modulators become cheap
enough for domestic use in the future or even DVDs, etc output a
modulated digital RF signal just like old VCRs did with an analog RF
channel. Yet I belive it is (and will be) cheaper to buy a DVD or
other set top box for every TV than to distribute the signal from one.
From: UCLAN on 22 May 2010 00:51
mm wrote:

>>> Does there exist the opposite of an RF Modulator? Something that will
>>> take RF and turn it into digital for a digital tv?
>>
>> Well, a RF *demodulator* takes analog RF and converts it to analog A/V. A
>> A->D converter will convert that to digital.
>>
>>> Can I convert the analog back to digital for the digital tvs?
>>
>> A A->D converter will do the trick. $$ for video.
>>
>> Question: For the digital TVs, why not just use the original digital
>> signal?
>
> I don't know. I guess I can. I didnt' think of it. Thanks.
>
> I guess I would have to use a couple spitters to make a route around the RF
> modulator, and then I would be running analog and digital on the same
> co-ax, right?

If you split it off to the digital TVs *before* it goes into the D->A
converter box, then it would be only digital - right?
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