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Thread: has anyone thought of adding noise cancellation to the car stero?

  1. #1
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    has anyone thought of adding noise cancellation to the car stero?

    i bought a pair of noise cancellation headphones and they are pretty neat

    i was wondering if any one ever has or thougth about applying the same concept to the car stero

    you would probably need 2-4 tiny mic's and then and out put for the stero but i mean even though its a bigger area it should work right?

  2. #2
    FLAC DodgeCummins's Avatar
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    Yea, but my wife wouldn't appreciate me not listening to her.

  3. #3
    Maximum Bitrate Altimat's Avatar
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    Fabricator

  4. #4
    Constant Bitrate cafn8's Avatar
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    Quote Originally Posted by crash893
    i bought a pair of noise cancellation headphones and they are pretty neat

    i was wondering if any one ever has or thougth about applying the same concept to the car stero
    Yes. About 3 weeks ago, in fact.

    Phase Reverse?

  5. #5
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    my post on the other thread.

    "guys none of this can work. In an automotive enviroment it is not a case of simply playing an inverted signal through the car speakers. Oh if only it was!!! (my 4th yr project would be so much simpler )

    Basically if you are interested google-> filtered X-LMS algorithm.

    she's not too robust, but she'll get you started. Basically you have to make an approximation of your mic -> speaker transfter function first (system identificaiton), and then run a FX-LMS algoritm on this assumption. The algorithm uses a least squares routine to estimate correct filter weights to apply to the microphone signal to output to the car speakers.

    Youll be a lot better off running bose speakers on your head - unless you like playing with these things

    HTH

    Stu"



    Altimat - that looks interesting, do you have any other info on it?

    Stu

  6. #6
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    The source Altimat has linked to is a system for noise cancellation and reduction in recording for playback in a noisy environment. Not for playing back prerecorded sound in a noisy environment.

    Its the kind of stuff that telephones and the like use to cancel out background noise. The stuff talked about here is a different beast altogether, and I'm not sure how viable it is.
    I once read an article about Audi/VW working with a car audio company to develop a system to cancel road noise using a microphone/speaker set up. I can't for the life of me find any links to it though. Was 4 or 5 years ago when I saw it.

  7. #7
    Variable Bitrate Cherub211's Avatar
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    There is another thread very similar to this one going around. Sorry I don't have a link.

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