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Solid State Video Recording Device

Discussion in 'Electronic Design' started by David Harper, Sep 16, 2004.

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  1. David Harper

    David Harper Guest

    Is anyone aware of a solid state video recording device (chip?) that
    will record analog video input and is easily configured and
    controlled? Digital cameras with this capability are nice, but won't
    cut it for this application. It needs to accept video from an
    external source and have 2 minutes of record time or more.

    Thanks in advance for any advice!
  2. Ian Stirling

    Ian Stirling Guest

    Are you looking for b+w security camera, or broadcast quality?
    There isn't going to be a single chip that will do this, it'll be at
    least several, or a module.
    Do you want it to store the video without power?
    One or ten thousand?
    A laptop with a compactflash drive replacing the main disk, would be
    one way.
    Maybe not what you want though.
  3. The last time I had a look at uncompressed Video, was when
    30 seconds used 2GBytes. Therefore I assume you'd choose
    compressed video. I recently saw a TV/Video grabber device
    with MPEG2 for 150$ or so. It was with a USB2 interface.
    So a PC with a Flashdrive and some sensible OS should do it.
    Unfortunately MS Window does a fair amount of writing some
    state information and therefore is not Flash-able. But
    perhaps a Win XP embedded or a realtime Linux.

  4. I think the answer is 'no way'...
    What you want can easily be done digitally, and if the sample rate is well
    over that required for the analog bandwidth, and the output has good
    filtration, there is no reason not to go digital. All the solutions so far
    mentioned are digital, and there are some chips around, that will grab,
    digitise to a data stream, and compress, in only a couple of chips. Add a
    suitable memory device, and a chip to reconstruct the data, and you have
    the simplest solution. A chip like the SAA5284, might be the starting
    point for the acquisition circuit.
    The problem with analog, is that storage devices to store analog data, and
    allow it to be clocked out, are either not solid state (tape etc.), or are
    non static (devices like the bucket-brigade delay line). In either case,
    the amount of data involved, even assuming quite low quality, involves a
    lot of parts...

    Best Wishes
  5. Joerg

    Joerg Guest

    Hi David,

    A while ago a company called Coatue wanted to develop this technology,
    or at least the memory chips that enable it. But as far as I remember it
    got sold at least once and I don't know what became of it. Might be
    worth a Google search though.

    Regards, Joerg
  6. David Harper

    David Harper Guest

    Hopefully high quality. Not like DTV quality, but more than a
    security camera. This will be used on a high altitude application.
    A module is cool too.
    Power can be provided in this application.
    You mean pricewise? How about one hundred? :) JK, but the cheaper
    the better.
    That might be a viable option, but it'd have to be a lightweight
    single board computer, not a labtop. Since it's a high altitude
    application, ideally I'd like to get it under the 1 lb range.

    Does this bring any items into mind?

    Thanks for the response!

  7. David Harper

    David Harper Guest

    Did you mean something like this?

    That might be an option.

  8. David Harper

    David Harper Guest

    I may have been unclear, but my only requirement is that it needed to
    accept an analog 'input'. I was looking for a digital storage

    Thanks for the help. I'll check out the SAA5284.

  9. Joerg

    Joerg Guest

  10. Ian Stirling

    Ian Stirling Guest

    I was actually meaning one item, or ten thousand.
    If it's ten thousand, then designing one specially is an option, and
    getting to 100g is going to be almost trivial.
    If it's one, then you want something that'll just slot together, and
    it's going to be substantially harder.
    Motherboards of laptops, minus the screen/keyboard/... in a polysytene/carbon
    case might get you to 2lb, 1lb is going to be harder.

    Few "single board" computers have the ability to digitise video.
    You may also want to consider a conventional micro-mini camcorder,
    in a sealed air-tight case, which could almost hit your weight limit.
  11. Rich Grise

    Rich Grise Guest

    ISTR reading something not too long ago, mentioned in one of these NGs,
    about some unbelievable memory that was something like a crystal and two
    lasers, and one chip stored some ridiculous amount, like gigabytes. Or
    was that a gag, or was I hallucinating?

  12. Rich Grise

    Rich Grise Guest

    So all you really need is a video ADC and some bulk memory. That's
    almost trivial. I'd even surmise someone here could come up with an
    FPGA to do compression in one chip. So you've got one, maybe two
    chips for input (buffer(opt) and ADC), possibly one for compression,
    one for timing, and as much memory as you can afford.

    Nothin' to it!

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