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Car stereo frequency blocker

Discussion in 'Electronic Basics' started by [email protected], Apr 4, 2007.

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  1. Guest

    Hi, I have this problem:

    I live in a neighborg where some guys use to pass with car stereos
    playing music at such a high volume that my windows start
    shaking...seriously!....well what I'm looking (I hope it exists) for a
    device which can block their radio or car stereo just when they pass
    by in front of my house...not that I want to broke their stereos
    down...just some kind of "dead spot" for their car stereos to stop
    making noise!

    I need help and this group seemed to me that could help me...or maybe
    not, in any case please let me know if I'm at the wrong place or where
    can I find what I'm looking for ... if such a thing exists?

    Thanks to all
     
  2. Overlooking the fact that it's a crime, you'd have to jam the whole FM
    broadcast band, which would not go well with your neighbors. Even that
    wouldn't disable boom cars that were playing from CD, tape or MP3
    sources. If the boomers are annoying enough people, you might get
    together and agree to call in simultaneous complaints to the police,
    assuming that there is a local noise ordinance. Repeated complaints,
    from enough different people, will eventually draw some action. Don't
    try it alone, or you'll tag yourself as a troublemaker. I can't think of
    anything else that doesn't involve at least one felony.
     
  3. Bob

    Bob Guest

    What is a "neighborg"?

    Bob
     
  4. Old Mac User

    Old Mac User Guest

    Re: Audio Stimulus Dependency Disorder

    http://members.aol.com/mpwright9/oil.html

    http://members.aol.com/mpwright9/news.html

    See this one, where in a hate mail a 15-year-old girl in Australia
    gushes with


    enthusiasm over the
    "an energy flowing through our blood!"

    http://members.aol.com/mpwright9/boomgirl.html <--- some foul
    language

    She's talking about the powerful stimulus of boom car noise. It
    sounds exactly like the

    same kind of kick one expects from a narcotic.

    See also the article about vibroacoustic disease:

    http://www.citidep.pt/papers/articles/alvesper.htm


    http://www.omnisonic.com/bbillings.html
    "FEELING THE MUSIC CAN BE DANGEROUS TO YOUR HEALTH"©

    Assorted links...

    Loud Church Music
    http://www.churchsoundcheck.com/hlitl.html
    http://www.churchsoundcheck.com/faq3.html
    http://www.church-sound-forums.com/Loud-Church-Speakers.htm#findloud
    http://www.allchurchsound.com/ACS/edart/iile.html

    Vibroacoustic Disease

    http://osha.europa.eu/riskob/hearingloss/denmark/source_description.htm
    Slide Show (35 slides... click on the left edge)
    http://www.lowertheboom.org/CA'06-Slide_OnlineShow_WITH NOTES_files/frame..htm
    http://www.lowertheboom.org/trice/vad.htm
    http://www.citidep.pt/papers/articles/alvesper.htm
    http://www.noisefree.org/monitor.pdf
    http://www.sun-herald.com/NewsArchive2/082403/tp3ch18.htm?date=082403&story=tp3ch18.htm
    http://www.med.ub.es/~aprats/sae/EJA/EJA_V6_N1_04.pdf
    http://www.ainonline.com/issues/03_04/03_04_isvibroacousticp36.html
    http://kirbymtn.blogspot.com/2006/04/vibroacoustic-disease-and-wind.html
    http://www.bmj.com/cgi/eletters/331/7531/1502#125113
    http://www.springerlink.com/content/2j22nq15h9dhat6a/
     
  5. Bob Myers

    Bob Myers Guest

    "Welcome to our street. Here, I baked you this plate of
    cookies. Resistance is futile; you WILL be assimilated..."


    Bob M.
     
  6. Rich Grise

    Rich Grise Guest

    Well, barring calling the gendarmes for noise ordinance violations,
    I suggest something like this:

    http://www.physlink.com/estore/cart/SonicAirHorn.cfm

    You walk up to the offending car, and blast it in their window. You
    might want to bring a hammer, if they have their windows closed.

    Good Luck!
    Rich
     
  7. Ed

    Ed Guest

    First of all, I see we all had, dealt with the "boom car boy/girl"
    issue. Because I live outside United States and I didn't know you call
    it that way, no need to mention how good it describes their lack of
    selfesteem. Here's what I wanted to say to the ones who took the time
    for answer my post:

    Stephen J. Rush:

    Thanks man, serously! you'd probably thought I was some kind of guy
    who was trying to plan a crime, but you get quite serious and make
    what I call a very politically correct answer, and good one too, I
    mean it. When I wrotte this post last night in some sort of "desperate
    situations needs desperates measures". That was all.

    Old Mac User:

    Thank you man! Your post put a nice and selected piece of information
    for this subject. And by the way I'm 27.

    Rich Grise:

    I bought it today...let's hope they have their windows down!
    hehe...thanks!

    Bob:

    You just didn't make it....sorry.

    Peace out.

    Thanks again!...If I find a devive I'll let you know... :D
     
  8. Ed

    Ed Guest

    And jamie...when you're right, you're right.

    Peace
     
  9. Jamie

    Jamie Guest

    and most likely they are listening to CD's, not the radio.
     

  10. from an old freinds sigfile:

    I am Dyslexic of the Borg: Prepare to have your ass laminated!

    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  11. Lord Garth

    Lord Garth Guest

    Now THAT's funny!
     

  12. Glad you enjoyed it. :)


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  13. Bob

    Bob Guest

    What does "Peace out" mean? What's a "devive"?

    Bob
     
  14. Rich Grise

    Rich Grise Guest

    It's today's kidspeak for "Best Regards", or "Cheers!".
    Probably a typo of "device".

    Cheers!
    Rich
     
  15. It's antique language (60's) for good bye.
     
  16. jasen

    jasen Guest

    also, most of the loud ones aren't playing broadcast music.

    Bye.
    Jasen
     
  17. Guest

    Despite comments in other posts it IS possible to fix your problem if
    he is listening to an FM station.

    What u have 2 do is find which radio station he is listening to, and
    broadcast him a stronger signal that his receiver will lock onto in
    preference to the radio station. so long as u use a directional
    antenna aimed at the car, then none of your side neighbours need be
    affected.

    To fully automate the proceedure is going to be expensive though.
    Have an FM receiver that can scan the band on computer command. Store
    the received audio in your computer with both time and frequency
    information. Have a microphone listening to the offending car. Once it
    is determined that the volume is exessive your radio receiver scans
    the band and compares the audio from the microphone with the audio via
    your FM receiver. Once a match is found between the two audio signals
    you have found what station he is listening to. Now you can do
    whatever you please with the info. You could transmit just the FM
    carier frequency for his station which is equivalent to SILENCE, or
    you could be more ingenious. I take it that the offender is a regular
    one? Suppose that he comes the same way evey time. You could park your
    car 1/2 mile up the road in the direction he comes from. When your
    gear is ready to turn on your transmitter you also turn on some
    flashing lights and a siren on your car(via a CB radio link) and with
    your FM transmitter aimed at him, broadcast a prerecorded message that
    goes as follows "This is the Audio Police. Your listening pleasure has
    been interupted because you are disturbing the whole neighbourhood.
    Unless you turn your volume way down we will send you some real
    powerful bass that will burn out your boom box, but not before it
    blasts you through the windscreen. After this message you have 4
    seconds to respond. On future occasions there will be no prior warning
    before you are blown up"

    The reason for the computer is the tricky signal processing to get the
    audio match. Because of the variable distance to the car there will be
    a variable time delay between the audio from the FM and that from the
    car. It will be necessary to perform the mathematical operation of
    convolution between the two signals. This will need a reasonable
    processor power in the absence of a dedicated DSP and some efficient
    coding for the convolution program. You might need to upgrade your PC
    to a quad core.
    Rgds
    Roy
     
  18. Guest

    Hi'
    Roy here.
    I meant to post the 1st message to the group, but hit "send" instead.

    Could you plse put a copy there?
    Its my 1st time on the system
     
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