recent technology in the field of civil engineering and also for announcements

1. AUDIO SPOTLIGHTING
BY:
S.SUSHIL
V.VIJAYRAGHAVAN

2. INTRODUCTION
• Audio spotlighting is the very recent technology that creates
focused beams of sounds similar to light beams coming out of a
flash light or a spot light.
• The “shining” of sound to one specific location allows for the
targeting of specific listeners without people around them
hearing the sound.
• Audio spotlighting technology uses ultrasonic energy to create
extremely narrow beams of sound that behaves like beams of
light.
• It transmits auidible sound by using the non-linear property of
air.

3. DIFFERENCES BETWEEN NORMAL SPEAKERS
AND AUDIO SPOTLIGHTING
Normal speakers Audio spotlighting

4. WORKING
• Original low frequency sound wave is applied into an audio spotlight
emitter device. This low frequency signal is modulated with ultra
sonic frequencies.
• Modulated signal travel through the air and due to non-linerity
property of air new sound are formed within the wave.
• The new frequencies will be added into the sound wave by the air
itself.
• This frequency will be within the auidable range of humans.
• Thus we will not hear the ultra sonic sounds and will only hear the
new sounds formed by the non linear action of air.

5. WORKING PRINCIPLE

6. MODES OF AUDIO SPOTLIGHTING

7. AUDIO SPOT LIGHTING
Advantages
• Ultimate control in audio placement.
• Small storage space.
• Highly cost effective as maintaince
required is less compared to
conventional speakers.
• Minimizes noise pollution.
Disadvantages
• Lack of mass production
• Most common form of distortion is
clipping.

8. APPLICATIONS
Automobile Millitary applications Public announcements

9. SCOPE
• Audio spotlighting holds promise of replacing the current
conventional speaker systems
• It allows user to control who hears the sound produced gives
them near absolute control of the sound.
• This allows for audio spotlighting to be implemented in almost
all communication fields as the basic form of our commication
is via sound.

10. CONCLUSION
Audio spotlighting is going to change a view in
sound transmission as it lets us decide in which
direction sound should propagate. Thus making it
applicable in several fields.

11. REFERENCES
• www.thinkdigit.com
• www.holosonics.com
• www.spie.org
• www.howstuffworks.com
• www.abcNEWS.com