Dave asked in Consumer ElectronicsTVs · 1 month ago

I need an unswitched HDMI splitter, 2 in 1 out. All I can find is 1 in 2 out. How does a HDMI cable know which way the signal is travelling?

6 Answers

  • 1 month ago

    Not true at all

  • lare
    Lv 7
    1 month ago

    The HDMI carries a 5volt dc current on one connector. the 5 volts originates at the video source and terminates at the video destination. that is how the cable knows which way the video travels. more importantly it tells connected devices that information.

  • 1 month ago

    A "cable" does not - but each HDMI connector on a device has electronics behind it, which pass or amplify signals in one direction only.

    A splitter has one input from another device output, and two outputs to feed other device inputs.

    It's like you can talk and two people both hear the same thing, completely clearly.

    The reverse is just not possible as the the two HDMI outputs are both "talking" and the input device would not be able to make sense of two completely different signals, like two people continuously shouting different instructions in your ear at the same time..

    You need a switch box or selector of some sort - an HDMI selector or HDMI KVM switch, that allow one OR the the other signal to be selected and fed to the switch output and display input.

    If you want to be able to see both inputs at the same time, like a CCTV multi-panel display grid, it's a very different and vastly more complex unit that has to decode and (internally) "display" the different image signals, then re-code the combined signal and send that out.

  • 1 month ago

    A "splitter" allows sending one signal to more than one destination. 

    An HDMI splitter Can Not be used in reverse.  


    A "switch(er)" allows selection of one of two or more signals for one input. 

    It can be used in reverse if that is desired. 


    What you seem to be asking for is an "automatic switch(er)". 

    I haven't seen one for HDMI, but they do exist for other signals, 

    so there's a chance. 

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  • P
    Lv 7
    1 month ago

    All "Split" HDMI connections need to be on a switch (manual or electronic) otherwise they will not work.  It's a digital 2 way connection for both devices to exchange information.  It's nothing like the old analogue RCA connections you might be used to.

  • opurt
    Lv 7
    1 month ago

    It's part of the HDMI spec, devices communicate with each other to synchronize their capabilities and requirements, and part of that would be which end has the source and which one is the display.

    What do you actually want to do, because you can't split two images into one as that's the complete opposite of what "split" means. A splitter will take one image and send it to multiple devices that all show the same one image, a switch will take input from multiple devices and select one of them to go to a display. Maybe you want a multiplexer to show two images on one screen, but those are more expensive since the device has to do more processing.

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