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

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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
    Yea, but my wife wouldn't appreciate me not listening to her.
    current projects

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    • #3
      I'm thinking about it now!

      http://www.andreaelectronics.com/pdf...Audio2spec.pdf
      Fabricator

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      • #4
        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.

        http://www.mp3car.com/vbulletin/showthread.php?t=22132

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        • #5
          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

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          • #6
            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.

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            • #7
              There is another thread very similar to this one going around. Sorry I don't have a link.
              http://www.arizonasportcompacts.com

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