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Thread: auto mobile phone mute

  1. #1
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    Question auto mobile phone mute

    hi ppl !!

    it's been quite some time since my last posting, but that doesnt mean I stopped visiting this great forum!!

    anyways, I have just installed my new sound system which includes a Cerwin Vega Stealth 12" sub with box .... i love it

    Now, my head unit is an Aiwa CDC-R917M which i find great for my needs - it has a nice simple display, no skipping, and it hides face when turned off. Now it also has a wire at the rear - a brown one - which is called telephone mute. On the instructions it says that it is used to automatically mute the sound when the phone (in its hands free car kit) rings. I think that this wire obviously accepts some sort of voltage signal in, just as the (blue) power on of the amp.

    My question is: Does anyone know what this voltage is? And does anyone has any idea of how to make this possible with out installing a hands free kit ??



    Ed ....

  2. #2
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    it vasries from system to system, you need to check the instruction book. mine has to be grounded to be activated, which my nokia car kit does so I have just connected the two and it works fine, my headunit also has a phone speaker input so now the phone goes through the car speakers.

  3. #3
    Constant Bitrate
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    just use a fuse in the middle and ground it for muting. Generally all car phones give out a -ve, ie 0 volt signal.

    It works very well with my bose and I300 car kit.
    ALIBABA - I30 99
    Nemiah M10000, C134
    DVD, 40Gig, 256MB DDR
    GPS, OBD 2, Reverse Cam
    Mute on stereo w I300 car kit
    Liliput 7in w usb touch screen
    Direct connect with BOSE-CD changer

  4. #4
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    ok, i will try and see what happens, i hope that the fuse works well if needed !!

  5. #5
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    Quote Originally Posted by armoured !!
    ok, i will try and see what happens, i hope that the fuse works well if needed !!
    The audio mute input on your radio has a weak internal pull up resistor, and the radio will mute when this line is pulled to ground. The cellular mute wire on your hands free device is high impedance or 'open circuit' when the phone is NOT in a call. When the phone rings or is in a call the hands free device will ground the cellular mute wire which will easily overdrive the weak pullup resistor on the radio and the radio will mute.

    My setup is headunitless so I had to use a relay...I used the cellular mute from my cellport as the ground for the relay hence the relay only activates (wired to turn off remote signal to eq) when my cellport grounds the cellular mute wire. This works very well

  6. #6
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    hello again -

    just to tell you that I tried your suggestions and the method of grounding the wire worked well. As usual, this forum with its helpful members helped me once more with my in car entertainment setup !!! thanks

    My next step is now to get one of those things that are battery operated and flash when they detect radiation from a mobile phone, to make it activate a relay which grounds that wire ...

    if anyone has any suggestions, i'd be happy to hear from you!


    Ed...

  7. #7
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    I used to have one of those flashy things that detect when the phone's giving off a signal- basically they don't work! Well, ok- they do, but because you're using a cellular network the phone will always be roaming between masts and checking for signals and the device will always be going off. It'll do this every so often even if you're not moving... What were you hoping to hook the relay up to anyway?

  8. #8
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    um well i really dont know - i was thinking that some sort of relay could be used to ground the mute signal wire from the head unit whenever that 'thing' flashes off.

    about those random flashing you're right, however i am willing to try it - it's not something expensive and i really need it cos i never hear my mobile phone when the sound is REALLY on !!!!!

    unfortunately im not very electronics oriented, im more into software and any ideas will prove to be useful ....

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  10. #10
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    Quote Originally Posted by Enforcer
    Get a car kit

    my intention is to have ANY mobile ANYWHERE in the car. And I hate to have the mobile phone sticking up my my dash. Plus my car has a place where to place it and i would like to keep it there Plus I like the challenge of doing things myself - like most people here, I think

    Ed ...

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