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interesting sounding ultrasound

Discussion in 'Electronic Basics' started by [email protected], Nov 23, 2005.

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  1. Guest

    Is it possible to produce an ultrasound with a varying sound or
    pitch... for example, replicating a police siren but at ultrasound
    level? What components would I need to produce this varying sound?
  2. Bob Masta

    Bob Masta Guest

    You have two issues here: Generating the electrical signal,
    and turning it into sound. To create the signal, you can use
    any of a number of voltage controlled oscillators (VCOs) and
    use a low frequency sine wave as the control voltage. That
    will cause the VCO frequency to slide up and down like a
    police siren, etc. Note that VCOs tend to have non-sinusoidal
    output waveforms, typically ramps or square waves with lots
    of harmonics.

    The big problem is converting this to sound. For near-audio
    frequencies (say, 20 kHz-40 kHz) you can try plastic piezo
    horn tweeters. Many have strong output in this range, but
    you will not get a flat frequency response... lots of huge
    dips and peaks. But its cheap enough to try.

    For higher frequencies, transducers tend to be tuned
    to specific ranges. You could warble a little within a
    given range, I suppose.

    If we knew what you plan to do with this, we might
    have more-specific suggestions.

    Best regards,

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    Home of DaqGen, the FREEWARE signal generator
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