video over phone line?

FlyingFishFinger

Is it possible to transmit video over a phone line with a basic stamp?
I know that it is possible in general (...google...), but can it be done with a CM8880 chip ans Stamp?
I'm not trying to do this, was just interested for future possibilites.
Rafael

steve_b

The stamp can't do any "proper" audio or video sampling.
what it can do is control devices that would do audio/video.
You could also use the stamp to sample for audio or audio level (just to see if audio was present...not to actually mix)...same with video (blanking freq's and such).

At least that's my gist on it!

You could use one of those little flashdrive modules that the stamp can work with. Have the stamp connect to a modem and then MAYBE have the flashdrive doo-hicky send it's image data thru the modem....Talking out my bum on this one! [noparse];)[/noparse]

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Steve

"Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."

Forrest

video and phone lline - those terms don't go together. You simply don't have the bandwidth necessary to transmit video over phone lines. You'll need a broadband connection for video.

steve_b

True...there's streaming video and there's single images.
You could send some pretty rough stills at 5fps (haha) and a dumbed down resolution...but then again, why would ya want to!
[noparse];)[/noparse]

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Steve

"Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."

Paul Baker

Video over phone lines have been claimed by many people, one of the most notable is Adam Clark of Australia. He claimed to invent a 1000:1 video compression suitable for sending DVD quality video over a standard telephone line that he dubbed the Adam Platform. He garnered $81 million in investments from various groups and individuals to develop a product based on the technology, in part based on an "independent" evaluator, the Tolly Group. Turns out it was a huge scam that stung the main investor, MWC, pretty badly.

Heres a couple articles: http://www.smh.com.au/articles/2003/10/13/1065917330240.html?oneclick=true

http://www.talkaboutcomputing.com/group/comp.compression/messages/81617.html

Quality video over phone lines is a pipe dream (its 8kHz sample rate for pete's sake, it isn't even fast enough to sample voices well, our minds fill in sibilence and other higher frequency audio through cues, we understand phone audio because of our minds ability to "fill in the blanks").


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Post Edited (Paul Baker) : 11/12/2005 5:46:21 PM GMT

SteveW

Err, there's a large industry dedicated to the art of sticking video over phone lines.
http://www.homechoice.co.uk/ , for instance.
Video on demand, over ADSL. Works a treat.

However, the cunning inside that set-top is a bit more elaborate than a Stamp, and the compression boxes even more so. However, video over phone lines is not necessarily a scam...

Steve

(Yes, I do have a link to Homechoice. There are other providers of similar services)

Paul Baker

POTS != ADSL (plain old telephone system is not the same as asymmetric digital subscriber lines), one is voice only, the other is data and voice. Video over telephone lines, interpreted in it's broadest possible sense was present on ISDN systems back in the 80's, sure a telephone wire itself is capable of carrying enough data to do video, but if the system its connected to doesn't accept the bandwidth nessesary, it's not going to work. I suspect he would have said "Is video possible over DSL?", if he meant that.

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Post Edited (Paul Baker) : 11/14/2005 3:11:24 PM GMT

SteveW

Well, yes. I know this. The blanket statement that

"video and phone lline - those terms don't go together. You simply don't have the bandwidth necessary to transmit video over phone lines."

needed a bit of clarification, since it's something I do day in, day out, to thousands of customers...
And, while ADSL != POTS, the phone line is exactly the same. There's just a bit more silicon on the ends [noparse]:)[/noparse]
If our chap wants to shove video over phone lines using a Stamp to control what's being sent, then such things are entirely possible. Fun, even, in a warped sort of a way.

Steve

Bean

This probably isn't what you mean, but you could send serial data over the phone line and use something like the SX-Video modules to show video on the other end. Again I doubt this is what you meant.
Bean.

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Forrest

When I said video and phone lines don't go together - I was referring to POTS. There's no problem sending video over DSL. I'm very familiar with DSL - having subscribed to this service 3 years ago.