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AUDIO SPOTLIGHTING

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audio spotlighting presented by: namrata maurya ei-4rth year 0712232035 – PowerPoint PPT presentation

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Title: AUDIO SPOTLIGHTING


1
AUDIO SPOTLIGHTING

  • PRESENTED BY

  • NAMRATA MAURYA
  • EI-4rth
    Year

  • 0712232035

2
INTODUCTION
  • Audio spot lighting produces audio beam like a
    flash light.
  • Make use of interference from ultrasonic waves.
  • Potentially great dynamic range(better than
    speaker cones).

3
THEORY
  • Audio spotlighting is a technology that creates
    focused beam of sound similar to light beam
    coming out of a flash light.
  • By shining sound to one location, specific
    listeners can be targated with sound without
    others nearby hearing it.
  • The audio spotlighting hyper sound technology
    uses ultrasonic energy to create extremely beams
    of sound thaht.t behave like beams of light.

4
Technology
  • It is developed by American tecnology
    corporation uses Ultrasonic energy to create
    extremely narrow beam of sound that behave like
    beam of light .
  • Ultrasonic sound is that sound that has very
    small wavelength in the milimeter range and you
    can not hear Ultrasound since it lies beyond the
    threshold of human hearing.

5
TWO WAYS TO USE AUDIO SPOTLIGHT
6
Components Specifications-
  • Audio Spotlight Transducer-
  • Light weight,nonmagnetic transducer.
  • 1.27 cm thick and 30.48cm in diameter.
  • It can project a three-degree wide beam of sound
    over 100 meters distance.
  • The sound beam Processor/Amplifier-
  • These are integrated into a system about the size
    of a traditional amplifier and they use about the
    same amount of power.

7
WORKING
  • Low Beam Angle is required to focus the sound.
  • Smaller the wave length ,Lesser the Beam angle.
  • Another way to focus sound is to increase
    Aperture size of speaker(10m dia for
    20Hz)practcally difficult.

8
Special Features of Audio Spotlight
  • A comparison with conventional LoudSpeaker-
  • Creates highly focused beam of sound.
  • Sharper directivity than conventional
    loudspeaker.
  • Uses inherent non-linearity of air for
    demodulation.
  • Highly cost effective.

9
Range of Hearing
  • The human ear is sensitive to frequency ranging
    from 20 to 20,000Hz.
  • If the range of human hearing is expressed as
    of shift from the lowest audible frequency to
    highest it spans a range of 100,000.
  • No single loudspeaker element can operate
    efficiently over such a wide range of
    frequencies.
  • Using this it is possible to design a perfect
    transducer which can work over a wide range of
    frequency which is audible to human hear.

10
Application
  • Automobiles-Beam alert signals can be directly
    propogated from an announcement device in the
    dashboard to the driver.
  • Public announcement-Highly focused announcement
    in the noisy environment such as
    subway,airport,parks,traffic intersections etc.
  • Safety officials-Portable audio spotlighting
    devices for communicating with a specific person
    in a crowd of people.
  • Military applications-Ship to ship communication
    and ship board announcement.
  • Entertainment system-In home theatre
    system(properties of sound can be improved).

11
Advantages
  • Can focus sound only at the place you want.
  • The focused or directed sound travels much faster
    in a straight line than conventional loudspeaker.
  • Dispersion can be controlled.
  • Can reduce or eliminate the feed back from
    microphones.
  • There is no lag in reproducing the sound.

12
Future of Audio spotlighting
  • Even the best loudspeaker are subject to
    distortion their omni directional sound is
    annoying to the people in the vicinity who do no
    wish to listen.
  • Audio spotlighting system holds the promise of
    replacing convetional speakers.It allows the user
    to control the direction of propogation of sound.
  • The audio spotlight will force people to rethink
    their relationship with sound.
  • Audio spotlight really put sound where you want
    it.

13
Conclusion
  • Audio spotlight is really going to make a
    revolution in sound transmission and the user can
    decide the path in which audio signal should
    propogate.
  • Due to unidirectional propogation it finds
    application in large number of fields.
  • Audio spotlighting system is going to shape the
    future of sound and will serve our ears with
    magical experience.c

14
THANK YOU
15
NON-LINEARITY OF AIR
  • Audio spotlighting exploits the property of
    non-linearity of air.
  • When inaudible ultrasound pulses are fired into
    the air, it spontaneously converts the inaudible
    ultrasound into audible sound tones, hence proved
    that as with water, sound propagation in air is
    just as non-linear, and can be calculated
    mathematically.
  • A device known as a parametric array employs the
    non-linearity of the air to create audible
    by-products from inaudible ultrasound, resulting
    in an extremely directive, beamlike wide-band
    acoustical source.
  • This source can be projected about an area much
    like a spotlight, and creates an actual
    spatialized sound distant from the transducer.

16
EXAMPLE
PARAMETRIC LOUDSPEAKER- AMAZING AUDIO SPOTLIGHT
17
  • The Audio Spotlight uses a beam of ultrasound as
    a "virtual acoustic source", enabling
    unprecedented control of sound distribution. The
    graph to the right shows the real sound field of
    the The Audio Spotlight uses a beam of ultrasound
    as a "virtual acoustic source", enabling
    unprecedented control of sound distribution. The
    graph to the right shows the real sound field of
    the Audio Spotlight versus the theoretical
    maximum directivity of any loudspeaker, panel,
    dome, or "shower" of the same size. As shown by
    this comparison, no loudspeaker in the world can
    approach the level of control provided by Audio
    Spotlight technology.



18
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