audio spotlighting- shriya
TRANSCRIPT
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Visvesvarya Technological UniversityBelagum , Karnataka
AUDIOSPOTLIGHTING
Technical SeminarBy
Chengodi.P(1ico7ec008)8th sem ECE
HOD:Prof.Vaibhav
Guided by:Mrs.Hema
Impact College Of Engineering And Applied SciencesBanglore-92,Karnataka
Bachelor of engineeringIn
Electronics And Communication Engineer
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IS IT POSSIBLE TO CONFINE SOUND TO A SMALL AREA???
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WHAT IS AUDIO SPOTLIGHTING?
Audio spotlighting is a technology that creates focused beams of sound
‘Shining’ sound to one location to target specific listeners
Invented by Joseph Pompei at MIT
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HOW ???
Combines non-linearity of air & narrow ultrasound beams
Ultrasound beams are beyond human audible range
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HOW ???
Ultrasound beams - used as carrier Highly directive Device used- parametric array Modulation and demodulation
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HOW ???
As the beam moves through air gradual distortion takes place in a predictable way due to non-linear property of air & gives rise to audible components
Ultrasound beam acts as an airborne speaker
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AUDIO SPOTLIGHT CREATES FOCUSED BEAM OF SOUND UNLIKE CONVENTIONAL LOUD SPEAKERS
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Audio spotlight looks like a disc-shaped loudspeaker.
When one points the flat side of the disc in your direction, you hear whatever sound he's chosen to play for you.
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COMPONENTS USED
Transducer Signal Processor Amplifier
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PARAMETRIC SPEAKER-AUDIO
SPOTLIGHT Airborne ultrasounds of
28kHz are modulated with audio signals. Inherent non-linearity of the air works as a de-modulator. Thus de-modulated sounds impinge on our eardrums. We can hear those sounds!
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TO ACHIEVE MORE FOCUSED SOUND
Small beam angle Smaller the wavelength
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CONVENTIONAL LOUDSPEAKERS
Spreads in all directions (360 degrees) Requires large aperture size for higher
directivity (i.e. 10m diameter for 20Hz) which is not practical.
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MODES OF AUDIO SPOTLIGHT
Direct audio
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Projected audio
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FEATURES OF AUDIO SPOTLIGHT
Creates highly FOCUSED BEAM of sound
Sharper directivity than conventional loud speakers
Uses non-linearity of air for demodulation
Cost effective
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FEATURES OF AUDIO SPOTLIGHT
Thin and flat & do not require a mounting cabinet
Focused or directed sound travels much faster
No lag in producing sound
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APPLICATIONS
Military & security communications
Museums Audio/video
conferencing Automobiles
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APPLICATIONS
Entertainment Exhibition & sales Public
announcements
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CONCLUSION“put sound where you want”
Even the best loud speakers are prone to distortion & omni direction of sound may be at times is annoying to few listeners
Audio spotlighting would replace loudspeakers in near future and allows user to control direction of sound
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THANK YOU