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The ultrasound column repott as airborne speaker, and as the beam moves through the air gradual distortion takes place in a predictable way. In order to focus sound into a narrow beam, you need to maintain a low beam angle that is dictated by wavelength.

To ensure that the shortest audible wavelengths are spotligthing into a beam, a loudspeaker about 10 meters across is required, and to guarantee that all the audible wavelengths are focused, even bigger loudspeakers are needed.

Highly cost effective as the maintenance iequiied is less as compaied to conventional loud speakeis and have longei life span.

The ultiasound column acts as a aiiboine speakei, and as the beam moves thiough the aii giadual distoition takes place in a piedictable way. Thus audio spotlighting helps us to control seinar sound comes from and where it sootlighting.

These transducers are arranged in form of an array called parametric array in order to propagate the ultrasonic signals from the emitter and thereby to exploit the nonlinearity property of air. Ultiasonic amplifiei iequiies 48V DC supply foi its woiking and low voltage foi miciocontiollei unit and othei piocess management. If the source loudspeaker can be made several times bigger than the wavelength of the sound transmitted, then a finely focused beam can be created.

Joseph Pompei while a graduate student at MITwho is the master brain behind the development of this technology. The focused oi diiected sound tiavels much fastei repport a stiaight line than conventional loudspeakeis.


Highly focused announcement in noisy enviionments such as subways, aiipoits, amusement paiks, tiaffic inteisections etc. Then mail to us immediately to get the full report. Prnjcctcd nr Virtual mndc: It’s markedly different from a conventional speaker, whose orientation makes much less difference.

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In museums audio spotlight can be used to desciibe about a paiticulai obect to a peison standing in fiont it, so that the othei peison standing in fiont of anothei obect will not be able to heai the desciiption.

The problem here is that this is not a very practical solution. These tones make use of non-lineaiity piopeity of aii to spohlighting new tones that aie within the iange of human heaiing which iesults in audible sound.

For the maximum volume sound level that trade show use demands, it is recommended that the Audio Spotlight speaker, more accurately called a transducer, is mounted no more than 3 meters from the average listeners ears, or 5 meters in the air.

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Unfortunately, most of the human-audible sound is a mixture of signals with varying wavelengths between 2 cms to 17 meters the human hearing ranges from a frequency of 20 Hz to 20, Hz. To generate such sound out of pure ultrasound tones is not easy.

This effectively means the sound that you hear will be propagated through air equally in all directions. Conventional loudspeakeis suffei fiom amplitude distoitions, haimonic distoition, intei – modulation distoition, phase distoition, ciossovei distoition, cone iesonance etc. High efficiency ultiasonic powei amplifieis amplifies the fiequency modulated wave in oidei to match the impedance of the integiated tiansduceis. Distortion reduction by preprocessing.

A device known semniar parametric array employs the non-linearity of air to create audible by products from inaudible ultrasound, resulting an extremely directive and beam like sound. Hence, except for very low wavelengths, just about the entire se,inar spectrum tends to spread out at degrees. In oidei to conveit the souice signal mateiial into ultiasonic signal a modulation scheme is iequiied which is achieved thiough a modulatoi.


A laige loudspeakei will focus the sound ovei a smallei aiea. Due to the unidirectional propagation it finds application in large number of fields. Audio spotlighting exploits the property of non-linearity of air. Audio spotlighting system holds the piomise of ieplacing conventional speakeis. 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.

Audio spot lighting is a veiy iecent technology that cieates focused beams of sound similai to light beams coming out of a flash light.

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Ultiasonic sound is that sound which have veiy small wavelength in the millimetei iange. Human speech, as well as music, contains multiple varying frequency signals, which interfere to produce sound and distortion.

This technology is similai in that you can diiect the ultiasonic emittei towaids a haid suiface, a wall foi instance and the listenei peiceives the sound as coming fiom the spot on the wall. They spotlightint not travel as narrow beams which is why you don?

It uses audik non-linear acoustics for its working. By shining sound to one location, specific listeners can be targeted with sound without others nearby hearing it. Inherent non-linearity of the air works as a de-modulator. In order to deal with this speaker manufacturers carve the audio spectrum into smaller sections. About a half-dozen commonly used speaker types are in general use today. It is capable of pioducing audibility up to 2OO meteis with bettei claiity of sound.

Both use ultrasound based solutions to beam sound into a focused beam. Audio spot lighting is a very recent technology that creates focused beams of sound similar to light beams coming out of a flashlight.