Why does this cable work???

Discussion in 'Audio/Video & Home Theater' started by MadScientist, Dec 11, 2012.

  1. MadScientist

    MadScientist Platinum Member

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    I am giving my old Canon camera to my son. He still has an old 27" CRT TV, that has composite but no HDMI connections. The camera came with a stereo AV cable that has a mini HDMI connector on one end and RCA composite; 2 stereo audio, 1 video, connectors on the other. http://www.adorama.com/ICAAVCDC400S.html

    I nor he has tried it out yet, but since it came with the camera I'm assuming it works. But without a DAC how????
     
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  3. sdifox

    sdifox No Lifer

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    err, I doubt it is a hdmi end.
     
  4. Zorander

    Zorander Golden Member

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    Doubt the camera sends out a digital signal (HDMI). It's probably sending out analog signals (composite) out of the mini-HDMI plug to the composite RCA ends. There are more than enough pins in the mini-HDMI plug to accomodate a composite video+audio signal.
     
  5. Matt1970

    Matt1970 Lifer

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    It's more than likely this.
     
  6. MadScientist

    MadScientist Platinum Member

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    This was my first thought, but there is also an optional cable you can use, a mini HDMI to an HDMI to hook the camera up from the same port on the camera to an HD TV. See page 38 of manual http://gdlp01.c-wss.com/gds/7/0300004757/01/PSSX230HS_SX220HS_CUG_EN.pdf

    http://www.bhphotovideo.com/c/product/516706-REG/Canon_2384B001_HTC_100_HDMI_Male_to.html

    Of course you can get this same cable from Monoprice for $3.20.

    So does the camera put out an analog signal when the composite cable is hooked up and then somehow switch to a digital signal when the HDMI cable is hooked up???
     
  7. Zorander

    Zorander Golden Member

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    I'm no expert on this but my next guess is the camera can detect if it is connected to a HDMI-capable or analog-only device (by checking for an open/closed circuit on one of its pin pairs, for example).
     
  8. MadScientist

    MadScientist Platinum Member

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    This sounds plausible. It has to be the camera detecting which signal to put out. You can not do it with just a cable; as these unhappy, scammed, customers at Amazon will attest to. http://www.amazon.com/HDMI-RCA-VGA-Cable-1-8m/dp/B002ZUI68G/ref=pd_sim_e_7
     
  9. Railgun

    Railgun Golden Member

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    That`s not mini HDMI. That`s a mini USB connection.
     
  10. MadScientist

    MadScientist Platinum Member

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  11. Railgun

    Railgun Golden Member

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    I'm referring to the cable you linked in the op.
     
  12. MadScientist

    MadScientist Platinum Member

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    Question answered. You are absolutely correct. I just spoke with my son who received the camera in the mail yesterday. The cable in my OP has a mini usb male connector that connects to the mini usb interface connector.

    Bad assumption on my part that it was a mini HDMI.
     
  13. Zorander

    Zorander Golden Member

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    I found this info in this thread which you may find interesting. It does not matter whether the cable is mini-HDMI or -USB. Both have enough pins to output composite audio+video signals.

    From what I gathered, all RCA plugs share one common ground, with the positive end of each of the three plugs connected on one of the pins on the other end (that's 4 pins used out of 5 available - I'm guessing the remaining pin is used for the above-mentioned detection purpose). The cable manufacturer either knows the pin layout of the device or there is a standard layout for this kind of cable.
     
  14. MadScientist

    MadScientist Platinum Member

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    Thanks for the info. My son's guess is that it's the camera's firmware that makes it possible to use the same mini USB port for the mini USB/USB cable to download pics/movies to your PC and also connect the camera to a TV with the mini USB/RCA composite cable.