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Explore Audio Spotlighting with Free Download of Seminar Report and PPT in PDF and DOC Format. Also Explore the Seminar Topics Paper. Audio Spotlighting Full seminar reports, pdf seminar abstract, ppt, presentation, project idea, latest technology details, Ask Latest information. Audio Spotlighting report, Audio Spotlighting ppt download, Audio Spotlighting pdf, Audio Spotlighting technology, Audio Spotlighting fundamentals, Audio.

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So that the output of the emittei will be moie poweiful and can covei moie distance.

Audio Spotlighting Complete – [PDF Document]

Download your Full Reports for Audio Spotlighting Hi-fi speakers range from piezoelectric tweeters of various kinds of mid-range speakers and woofers which generally rely on circuits at large enclosures to produce quality sound, whether it is dynamic, electrostatic or some other transducers- based design. 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.

This source can be projected about an area much like a spotlight, and creates an actual specialized sound distant from the transducer. Specific listeneis can be taigeted with sound without otheis neaiby heaiing it, i. This effectively means the sound that you hear will be propagated through air equally in all directions.

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. They do not travel as narrow beams which is why you don? If the souice loudspeakei can be made seveial times biggei than the wavelength of the sound tiansmitted, then a finely focused beam can be cieated. Theie aie no woofeis oi ciossoveis. Inan aiticle cited the nonlineai effects occuiiing in aii.

By using Audio spotlight – which concentrates the sound just as a spotlight does so only those in the “beam” can hear your message. A viitual sound souice cieates an illusion of sound souice that emanates fiom a suiface oi diiection wheie no physical loudspeakei is piesent.

Above all I express my thanks to Almighty for the blessings showered on me which leads to the successful completion of this work.


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In home theatie system ieai speakeis can be eliminated by the implementation of audio spotlighting and the piopeities of sound can be impioved. Engineers have struggled for nearly a century to produce a speaker design with the ideal 20Hz ,Hz capability of human hearing and also produce narrow beam of audible sound. The output of the modulatoi will be the modulated foim of oiiginal sound wave. 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, and can be calculated mathematically.

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

No single loudspeakei element can opeiate efficiently ovei such a wide iange of fiequencies. Are you interested in soptlighting topic. I shall acknowledge with any such errors if pointed out. This mode iequiies an unbioken line of appioach fiom the emittei of audio spotlighting system, so the emittei is pointed at the spot wheie the is to be heaid.

The mounting hardware is constructed with a ball joint so that the Audio Spotlights are easily aimed wherever the sound is desired. The smaller the repot, the less the beam angle, and hence, the more focused the sound. No single loudspeaker element can operate efficiently or uniformly over this range of frequencies.

Audio spotlighting system is going to shape the future of sound and will serve our ears with reporrt experience. The beam angle also depends on the apeituie size of the speakei.

Diiect mode iequiies a cleai line of appioach fiom the sound system unit to the point wheie the listenei can heai the audio. Thus in an audio spotlighting theie aie no actual speakeis that pioduces the sound but the ultiasonic seimnar acts as the aiiboine speakei. The Audio spotlight developed by American Technology Corporation uses Ultrasonic energy to create extremely narrow beams of sound that behaves like beam of light.

Some aspects of theii mechanical aspects aie mass, magnetic stiuctuie, enclosuie design and feport constiuction. A device known as parametric array employs the non-linearity of air to create audible by products from inaudible ultrasound, resulting an extremely directive and beam like sound. Whether they be dynamic, electrostatic, or some other transducer-based design, all loudspeakers today have one thing in common: This effectively means that the sound sptlighting heai will be piopagated thiough the aii equally in all diiections.


The audible portions of sound tend to spread out in all directions from the point of origin. Requiies only same powei as iequiied foi iegulai speakeis.

Joseph Pompei while a graduate student at MITwho is the master brain behind the development of this technology. A dedicated miciocontiollei ciicuit takes caie of the functional spotlignting of the system. Since the wavelength is smallei the beam angle will be aiound spotlightlng degiee, as sporlighting iesult the sound beam will be a naiiow one with a small dispeision. This is when teams of researchers from Ricoh and other Japanese companies repor together to come up with the idea of using pure ultrasound signals as a carrier wave, and superimposing audible speech and music signals on it to create a hybrid wave.

Both use ultrasound based solutions to beam sound into a focused beam. This requires multiple transducers and crossovers to create a ‘higher fidelity’ system with current technology.

But it is real and is fine to knock the socks of any conventional loud speaker.

Audio Spotlighting Complete

I express my gratitude to Head of Department EEE for rendering me all facilities and guiding me right through the end for the successful completion of the work. It uses ultiasonic spotlighitng to cieate extiemely naiiow beams of sound that behave like beams of semianr. They do not tiavel as naiiow beams. Airborne ultrasounds of 28 kHz are envelope-modulated with audio signals. This requires multiple transducers and crossovers to create a ‘higher fidelity’ system with current technology.

Due to the unidirectional propagation it finds application in large number of fields.