Audio spotlighting uses ultrasonic energy to create extremely narrow beams of sound similar to flashlight beams. It was invented in the 1970s and made commercially available in 2000. Audio spotlighting works by taking an original audio signal, modulating it with ultrasonic frequencies, and emitting it from an array of transducers. This allows the sound to be focused into a narrow, directed beam. Key components include a sound processor, frequency oscillator, modulator, and transducer. It has applications in areas like museums and ships where directable sound is useful. Advantages are directionality, no need for large speakers, and ability for nearby people to hear different sounds. Limitations include need for line of sight and inability to transmit over long

1. VIKAS KUMAR
EC 09
0901431115
MANSI GUPTA
EC 2011
1101431049

2. INTRODUCTION
HISTORY
THEORY
COMPONENTS & SPECIFICATIONS
TECHNOLOGY OVERVIEW
FEATURES & APPLICATIONS
ADVANTAGES & DISADVANTAGES
CONCLUSION

3. WHAT IS AUDIO SPOTLIGHTING?
 It creates focused beams of sound similar to
light beams coming out of a flashlight.
 It uses ultrasonic energy to create extremely
narrow beams of sound that behave like beams
of light

5.  AUDIO SPOTLIGHTING invented by Holosonics
Labs founder Dr. F. Joseph Pompei.
 First attempts created a single tone (1975).
 Audio tone made directive using a transducer array
by Ricoh, Japan (1983).
 It commercially available in 2000 by the company
Holosonics.

6. Into the depth of audio spot lighting
 Loudspeakers are direct radiating—that they
fundamentally a piston like device designed
to directly pump air molecules into motion to
create audible sound we hear
 The beam angle of audible sound is very
wide, just about 360 degrees
 In order to focus sound into a narrow beam,
you need to maintain a low beam angle that
is dictated by wavelength

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

11. Audio Spotlight consists of following major
components:
 Sound beam processor/amplifier
 Frequency oscillator
 Modulator
 Microcontroller
 Power supply
 Audio Spotlight transducer

12.  Worldwide power
input standard
 Standard chassis
171mm(w) x57mm(h)
x 280mm(d) option
mount rack kit
 Audio input: balanced
custom
configurations
available

13.  445 mm diameter, 12.7
mm thick, 1.82kg
 Wall, overhead or flush
mounting
 Audio input :100dB max
 Usable range :20m
 Audibility to 200m
 Compatible with
loudspeaker mounting
accessories due to
continue development

14.  The Audio Spotlight & Hyper Sonic Sound
uses ultrasonic energy to create extremely
narrow beam of sound that behave like beam
of light
 These ultrasonic sound have very small
wavelength

15. Apr 15, Spring 2002 CS 7497

16.  Physically small speakers
No need for
woofers, voice coils
 Power efficient
 Directionality
 Resultant audio retains directionality of
ultrasonic sound source

17.  Audio Spotlight
speakers allow visitor
to enjoy music while
other read nearby
peace & quiet

18.  Using this
technology two
person can hear
different sound while
standing close to
each other

19.  The US Navy using
this technology on
deck as a substitute
to the radio
operator's
headphones

20.  Can focus sound only at place you want
 Ultrasonic emitter devices are thin and flat
 The focused or directed sound travels much faster in
a straight line than conventional loudspeakers
 Dispersion can be controlled-a very narrow or wider
to cover more listening area
 There is no lag in reproducing the sound

21.  Line of sight should be clear
 Directivity directly depends on the length of the
ultrasonic column
 Long distance transmission is not possible

22.  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
 So we can conclude- Audio Spotlighting really
“put sound where you want it” and will be “A
REAL BOON TO THE FUTURE.”