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AUDIO SPOT LIGHT
VIKAS KUMAR EC 09
0901431115
MANSI GUPTAEC 20111101431049
CONTENTS
INTRODUCTION HISTORY THEORY COMPONENTS & SPECIFICATIONS TECHNOLOGY OVERVIEW FEATURES & APPLICATIONS ADVANTAGES & DISADVANTAGES CONCLUSION
INTRODUCTION
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
HISTORY 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.
THEORY
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
The original low frequency sound waves such as human speech or music are applied into an audio spotlight emitter deviceThis low frequency signal is frequency modulated with ultrasonic frequenciesSince ultrasonic frequency is used the wavelength of the combined signal will be in the order of few millimetersSince 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
CONVENTIONAL AND AUDIO SPOT LIGHT PHENOMENON
Components of audio spot light
COMPONENT & SPECIFICATION
Audio Spotlight consists of following major components:
Sound beam processor/amplifier Frequency oscillator Modulator Microcontroller Power supply Audio Spotlight transducer
SOUND BEAM PROCESSOR
Worldwide power input standard
Standard chassis 171mm(w) x57mm(h) x 280mm(d) option mount rack kit
Audio input: balanced custom configurations available
AUDIO SPOTLIGHT TRANSDUCER
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
TECHNOLOGY OVERVIEW
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
DIRECT AUDIO & PROJECTED AUDIO
Apr 15, Spring 2002 CS 7497
Features
Physically small speakersNo need for
woofers, voice coils Power efficient Directionality
Resultant audio retains directionality of ultrasonic sound source
APPLICATION 1
Audio Spotlight speakers allow visitor to enjoy music while other read nearby peace & quiet
APPLICATION 2
Using this technology two person can hear different sound while standing close to each other
APPLICATION 3
The US Navy using this technology on deck as a substitute to the radio operator's headphones
ADVANTAGES 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
DISADVANTAGES
Line of sight should be clear Directivity directly depends on the length
of the ultrasonic column
Long distance transmission is not possible
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
So we can conclude- Audio Spotlighting really “put sound where you want it” and will be “A REAL BOON TO THE FUTURE.”