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Thread: sound question

  1. #1 sound question 
    New Member
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    Hello all!

    i have a sound related question that has interested me the last couple of days..

    is it possible to use a normal loudspeaker and tune the electric info it gets (form a computer for example) so that people close to the speaker would here everything loud and clear and people a little further away would not or hear some kind of white noise?


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  3. #2 ... 
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    forgot to say:
    thanks in advance!


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  4. #3  
    Forum Ph.D.
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    I'd say NO , vibrations generated by the cone will propigate as normal sound waves
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  5. #4  
    Forum Radioactive Isotope MagiMaster's Avatar
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    It may be possible with multiple, specially designed speakers, similar to those that produce sound in a narrow line, but I'd bet that no matter how they're configured, there will always be places where the sound is audible outside the desired area. (For reasons similar to the impossibility of static magnetic bottles.)
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  6. #5  
    Forum Isotope (In)Sanity's Avatar
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    I read an article that some advertising firm came up with a vending machine that would direct sound in such a tight "beam" as to only allow a very small area to be able to hear the machine. The idea was to have advertisements coming from the machine while not disrupting the entire area.

    Not sure if this is the same technology I read about

    http://www.aes.org/e-lib/browse.cfm?elib=14770
    Pleased to meet you. Hope you guess my name
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  7. #6  
    Forum Bachelors Degree
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    Sure , you could use computer generated phased signals to speakers so that destructive interference cancels the sound signals in the unwanted directions, leaving only a narrow beamed sound.
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  8. #7  
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    Ok thanks alot everybody!
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