1. AUDIO SPOTLIGHTING
Presented by,
Biji Raju
S3.MCA#1203
MBIT,Anchal

2. CONTENT
INTRODUCTION
TECHNOLOGY OVERVIEW
RANGE OF HEARING
WORKING
BEAM DISPERSION
ARCHITECTURE
MODES OF LISTENING
ADVANTAGES & DISADVANTAGES
APPLICATIONS
FUTURE OF AUDIO SPOT LIGHTENING
CONCLUSION

3. What is Audio Spotlighting????
 Audio spot lighting is a very recent technology
that creates focused beams of sound similar to light beams coming
out of a flashlight. Specific listeners
can be targeted with sound without others nearby hearing it.
It makes use of non-linearity property of air.
 Uses ultrasonic energy to create extremely narrow beams of
sound that behaves like beam of light.
 Audio spot light is developed by American Technology
Corporation.

4. TECHNOLOGY OVERVIEWTECHNOLOGY OVERVIEW
• Audio spot lighting works by emitting
harmless high frequency ultrasonic tones
that human ear cannot hear.
• To produce highly focused audio signal
we use loud speakers with larger
aperture size

5. • Parametric array employs the non linearity
of the air to create audible by products From
inaudible ultrasonic sound , resulting in extremely
directive and beamlike sound.
As the beam moves through the air gradual
distortion takes place in a predictable way. This
give rise to audible components that can be
accurately predicted and precisely controlled.
TECHNOLOGY OVERVIEWTECHNOLOGY OVERVIEW

6. RANGE OF HEARING
• Human ear - 20 Hz to20,000Hz.
• No single loud speaker can operate efficiently
over such wide range of frequencies.
• By using this technology it is possible to design
a perfect transducer which can work over a wide
range of frequency which is audible to the human
ear.

7. WORKING
• The original low frequency sound wave such as
human speech or music is applied into an audio
spotlight emitter device.
• This low frequency signal is frequency
modulated with ultrasonic frequencies range with
wave length of few millimeters.
• Since the wavelength is smaller the beam angle
will be around 3 degree, as a result the sound beam
will be a narrow one with a small dispersion.

8. FIG:- F.JOSEPH POMPEI AT THE MEDIA LAB OF THE MASSACHUSETTS
INSTITUTE OF TECHNOLOGY DEMONSTRATES HOW INVISIBLE
ULTRASONIC WAVES, AS ILLUSTRATED HERE, COULD HELP "STEER"
SOUND. (ABCNEWS.COM)

9. Fig: AUDIO SPOTLIGHTING EMITTER
WORKING…….

10. WORKING…….
• Due to the nonlinearity property of air new sounds are
formed within the wave.
• The new frequencies (sounds) will be added into the
sound wave by the air itself.
• The new sound signal generated will be corresponding to
the original information signal with a frequency in the
range of 20 Hz to 20 KHz .
• Since we cannot here the ultrasonic sound, we only hear
the new sounds that are formed by the nonlinear action of
the air

11. COMPONENTS OF
AUDIO SPOTLIGHTING SYSTEM
 Power Supply.Power Supply.
 Frequency oscillator.Frequency oscillator.
 Modulator.Modulator.
 Audio signal processorAudio signal processor
 Microcontroller.Microcontroller.
 Ultrasonic amplifier.Ultrasonic amplifier.
 Transducer.Transducer.

13. 1. Power Supply: works off DC, ultra sonic amplifier
requires 48v for working and low voltage for other
components.
2. Frequency oscillator: generates ultra sonic
frequency signals (21,000 Hz to 28,000Hz).
3. Modulator : convert the source information
into ultrasonic signals. In addition, error
correction is needed to reduce distortion without
loss of energy.

14. 4. Microcontroller: takes care of the functional
management of the system.
5. Audio signal processor: The audio signal is sent to
an electronic signal processor circuit where
equalization, dynamic range control, distortion control
and precise modulation are performed to produce
a good quality sound signal.
6. Ultrasonic amplifier: High- efficiency ultrasonic power
amplifies the frequency modulated wave in
order to match the impedance of the integrated
transducers. So that the output of the emitter will be more
powerful and can cover more distance.

15. 7. Transducer : It is1.27 cm thick and17”diameter.Produces
audibility up to 200 meters with better clarity of sound.
• Has the ability of real time sound reproduction with
zero lag.
• These transducers are arranged in form of an
array called parametric array in order to
propagate the ultrasonic signals from the emitter and
thereby to exploit the nonlinearity property of air.

16. MODES OF LISTENINGMODES OF LISTENING

17. Direct Mode:
Requires a clear line of approach from the
sound system unit to the point where the listener can hear
the audio. To restrict the audio in a specific area this
method is appropriate.
Projected or Virtual mode:
For this mode of operation the sound beam from an emitter
is made to reflect from a reflecting surface.
A virtual sound source creates an illusion of sound source
that emanates from a surface.
This method is appropriate when we want to
send the information to a large number of people.

18.  Small size
 Single source
 Ultimate control in audio placement
 Minimizes noise pollution
 Ease of installation
 Lowest maintenance cost
 Reduced feedback
ADVANTAGES

19. ADVANTAGES
Small size
Single source
Ultimate control in audio placement
Minimizes noise pollution
Ease of installation
Lowest maintenance cost
Reduced feedback
DISADVANTAGES
 Lack of mass production. i.e, each unit must be hand
made.
 The most common form of distortion is clipping.
An LED on top of the Audio spotlight system reports
clipping, which is also perceptible to the listener as a kind
of a 'chirping' effect. If any signal produces distortion, the
input level of the source is reduced
until perceptible distortion is eliminated.

20. APPLICATIONS
 Automobiles
Beam alert signals can be directly propagated from
an announcement device in the dashboard to the
driver. Presently Mercedes-Benz buses are fitted
with audio spotlighting speakers so that individual
travellers can enjoy the music of there on interest.

21. 2.Retail sales: Provide targeted advertising directly at the point of
purchase.
3.Safety officials: Portable audio spotlighting devices for communicating with a
specific person in a crowd of people.

22. 4.Public Announcement: Highly focused announcement in noisy environments
such as subways, airports, amusement parks, traffic intersections etc.
5.Emergency rescue: Rescuers can communicate with endangered people far
from reach.
.

23. 7.Military applications: Ship – to – ship communications and shipboard announcements.
8.Audio/video conferencing: Project the audio from a conference in four different
languages, from a single central device without the need for headphones.
9.Sound Bullets: Jack the sound level 50 times human threshold of pain, and an offshoot
of audio spotlighting sound technology becomes a non-lethal weapon.
6.Entertainment system: In home theatre system rear speakers can be eliminated
by the implementation of audio spotlighting and the properties of sound can be
improved

24. 11.Museums: In museums audio spotlighting can be used to describe about a particular
object to a person standing in front it, so that the other person standing in front of
another object will not be able to hear the description.

25. FUTURE OF AUDIO SPOT LIGHTENING
Holds the promise of replacing conventional speakers.
It allows the user to control the direction of propagation
of sound. Will force the people to rethink their
relationship with the sound.
It really “put sound where you want it”.

26. CONCLUSION
Audio spotlighting is really going to make a revolution in
sound transmission and the user
can decide the path in which audio signal
should propagate. Due to the unidirectional
propagation 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..

28. REFERENCES
1. www.thinkdigit.com
2. www.holosonics.com
3. www.spie.org
4. www.houstuffworks.com
5. www. Tec alone .com

29. Thank You