2. A technology that creates focused beams of sound
similar to light beams coming out of a flashlight.
By shining sound to one location specific listeners
can be targeted.
Ultrasonic energy to create extremely narrow beams of
sound that behave like beams of light.
Introduction
3. Invented by the founder of Holosonics Labs, Dr. F.
Joseph Pompei of MIT.
First attempts created a single tone (1975).
Audio tone made directive using a transducer array by
Ricoh, Japan (1983).
Commercially available in 2000 by the company
Holosonics.
Disney was amongst the first major corporations to
adopt it for use.
4. AUDIO SPOTLIGHT looks like a disk-shaped
loudspeaker trailing a wire with a small laser guide beam
mounted in the middle
When one points the
flat side of the disk in
your direction, you
here whatever sound
one’s chosen for you.
5. Parametric array employs the non linearity
of the air to create audible by products from
inaudible ultrasonic sound , resulting in extremely
directive and beam-like sound
6. PARAMETRIC LOUDSPEAKER- AMAZING AUDIO
SPOTLIGHT
Low Beam Angle is required to focus
the sound.
Beam angle of audible sound is very
wide, about 360°
The smaller the wave length ,the lesser
the Beam angle.
Another way to focus sound is to use
loudspeaker with larger Aperture size.
7. 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.
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.
9. Modulated signal travels through the air.
Due to the nonlinearity property of air new sounds
are formed within the wave.
The new frequencies will be added into the sound
wave by the air itself.
frequency in the range of 20 Hz to 20 KHz .
Since we cannot hear the ultrasonic sound, we
only hear the new sounds that are formed by the
nonlinear action of the air
12. HOW TO USE AUDIO SPOTLIGHT ?
There are two ways to use Audio Spotlight.
First it can direct sound at a specific target creating
a contained area of listening space which is called
“Direct Audio”.
Second it can bounce off of a second object
creating an audio image which is called the “Projected
Audio” or the Virtual mode.
13. 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 emitte
r 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.
14.
15. Can focus sound only at the specific place one’s
want.
Sharper directivity than conventional
loudspeakers.
Uses non-linearity of air for demodulation.
Focused or directed sound travel much faster.
No lag in reproducing the sound & requires low
power.
16. Small size
Single source
Ultimate control in audio placement
Minimizes noise pollution
Ease of installation
Lowest maintenance cost
Reduced feedback
ADVANTAGES
17. DISADVANTAGES
Lack of mass production. i.e, each unit
must be hand made.
The most common form of distortion
is clipping.
21. two persons can hear different sound
standing close to each other
Audio Spotlight speakers allow
visitor to enjoy music while other
read nearby peace & quiet
Audio/video conferencing
Sound Bullets
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..
CONCLUSION
