Submitted To: Submitted By: Ms.Lekha Bhambu Sunita Sihag (A.P In CSE Dept.) 7357(cse8thsem.)

SEMINAR REPORTON

AUDIO SPOTLIGHTING

“AUDIO SPOTLIGHT” invented by Holosonics Labs founder Dr. F. Joseph Pompei (while a graduate student at MIT), who is the master brain behind the development of this technology.

Audio spot lighting is a very recent technology that creates focused beams of sound similar to light beams coming out of a flashlight.

FIG.1:-AUDIO SPOTLIGHT CREATES FOCUSED BEAM OF SOUND UNLIKE CONVENTIONAL LOUD SPEAKERS

Audio spotlight looks like a disc-shaped loudspeaker, trailing a wire, with a small laser guide-beam mounted in the middle

The Audio Spotlight & Hyper Sonic Sound Technology (developed by American Technology Corporation), uses ultrasonic energy to create extremely narrow beams of sound that behave like beams of light. Ultrasonic sound is that sound that has very small wavelength—in the millimeter range and you can’t hear ultrasound since it lies beyond the threshold of human hearing.

 

Audio spotlighting exploits the property of non-linearity of air. When inaudible ultrasound pulses are fired into the air, it spontaneously converts the inaudible ultrasound into audible sound tones, hence proved that as with water, sound propagation in air is just as non-linear.

. A device known as a parametric array employs the non-linearity of the air to create audible by-products from inaudible ultrasound, resulting in an extremely directive, beamlike wide-band acoustical source

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. This audio image gives the illusion of a loudspeaker, which the listener perceives as the source of sound, which is called “projected Audio”.

 

1.Power supply 2.frequency oscillator 3.modulator 4.audio signal processor 5.micro controller 6.ultra sonic amplifier 7.transducer

Can focus only at the place you want. Ultrasonic emitter devices are thin and flat and don’t require a

mounting cabinet. The focused sound travels much faster in a straight line than

conventional loudspeakers. Cal reduce feed back from microphones. Highly cost effective as the maintenance required is less as

compared to conventional loud speakers and have longer life span.

Requires only same power as required for regular speakers.

Automobiles:-Beam alert signals can be directly propagated from an announcement device in the dashboard to the driver.

Safety officials:- portable audio spotlighting devices for communicating with a specific person in a crowd of people.

Military applications:- Ship to Ship communications and shipboard announcements.

Entertainmanet system:- in home theatre system rear speakers can be eliminated by the implementation of audio spotlighting and the properties of sound can be improved.

Audio/video conferencing: Project the audio from a conference in four different language,forma single central device without the need for headphone.

Even the best loudspeakers are subject to distortion and their omni directional sound is annoying to the people in the vicinity who do no wish to listen.

This system holds the promise of replacing conventional speakers. It allows the user to control the direction of propagation of sound. The audio spotlight will force people to rethink their relationship with sound.