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Signal in through the headphone port?

Discussion in 'Android Devices' started by zcacogp, Oct 21, 2010.

  1. zcacogp

    zcacogp Well-Known Member
    Thread Starter
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    Oct 1, 2010
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    Lahndahn Tahn
    Chaps,

    I'm new here. Please be kind.

    I have a slightly odd question abouy my HTC Desire. Is it it possible to record using the headphone port as a signal input? As in, plug a signal out (from a recording desk or similar) into the headphone port and record the signal?

    I can find no reference to such a thing in the manual, or anywhere on the internet, so I am assuming it is not readily possible, but is it possible at all?


    Oli.
     

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  2. Rastaman-FB

    Rastaman-FB Well-Known Member
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    Sep 11, 2009
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    no its not
     
    zcacogp likes this.
  3. zcacogp

    zcacogp Well-Known Member
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    Lahndahn Tahn
    Short, clear and to the point ... thanks Rastaman!


    Oli.
     
  4. Cougar

    Cougar Well-Known Member
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    Lancashire, England
    It could be possible theoretically as the headphone socket is also a microphone socket (think integrated headsets). You'd need a custom plug as the connections won't be in standard positions on the 3.5mm jack - it'll have be a four-position connector with (I think) the Line In moved from tip to the highest ring - and you'd need some form of software which was capable of recording from Line In (does Voice Recorder work with a headset?)

    This is, as I said, theoretical (ie, I've just made it up), so usual disclaimers apply.
     
  5. zcacogp

    zcacogp Well-Known Member
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    Lahndahn Tahn
    Thanks Cougar. Sounds like a project for a dull weekend.

    I'd need to source a 4-ring plug, and make up a custom lead. However, it may prove to be too much of a faff to be worthwhile.

    Not easy, for sure. And it sounds like there isn't a ready solution out there.

    Thanks again.


    Oli.
     
  6. Cougar

    Cougar Well-Known Member
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    You know, I was thinking much the same (-:
     
  7. Cougar

    Cougar Well-Known Member
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    Thinking about it, it might also need sort of potential divider circuitry. My GCSE Electronics is a bit rusty, but a Line signal is higher voltage than a Mic signal.
     
  8. zcacogp

    zcacogp Well-Known Member
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    Oct 1, 2010
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    Lahndahn Tahn
    Line level / mic level - it doesn't much matter; if you have one you can produce the other. The question was more about whether it was possible to use the headphone jack 'backwards', so to speak, which you have now answered - thanks!

    (Dull weekend. Hmmm. We're heading for winter, the racing season is long gone and there is never anything good on TV. I think we're thinking the same thing here!)


    Oli.
     
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