AUDIO SPOTLIGHTING

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AUDIO SPOTLIGHTING

• 
  PRESENTED BY
• 
  NAMRATA MAURYA
• EI-4rth
  Year
• 
  0712232035

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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).

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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.

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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.

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TWO WAYS TO USE AUDIO SPOTLIGHT
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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.

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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.

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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.

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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.

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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).

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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.

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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.

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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

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THANK YOU
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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.

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EXAMPLE
PARAMETRIC LOUDSPEAKER- AMAZING AUDIO SPOTLIGHT
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• 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.

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