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It makes use of non-lineaiity piopeity of aii. This requires multiple transducers and crossovers to create a ‘higher fidelity’ system with current technology. By using Audio spotlight – which concentrates the sound just as a spotlight does so only those in the “beam” can hear your message.

This use ultrasound based solutions to beam sound into a focused beam. Since we cannot heai the ultiasonic sound wave we only heai the new sounds that aie foimed by non lineai action of the aii.

Post, and Mark F. Home Documents Audio Spotlighting Complete.

Audio Spotlighting Full Seminar Report, abstract and Presentation download

No single loudspeakei element can opeiate efficiently ovei such a wide iange of fiequencies. This acoustic device comprises a speaker that fires inaudible ultrasound pulses with very small wavelength which act in a manner very similar to that of a narrow column.

Human speech, as well as music, contains sppotlighting varying frequency signals, which interfere to produce sound and distortion. Thus in an audio spotlighting theie aie no actual speakeis that pioduces the sound but the ultiasonic envelope acts as the aiiboine speakei.

This gives rise to audible components that can be accurately predicted and precisely controlled.

It makes use of non- linearity property of air. Audio spotlighting woiks by emitting haimless high fiequency ultiasonic tones that human heai cannot heai. This source can projected about an area much like a spotlight and creates an actual specialized sound distant from a transducer.

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. To create a narrow sound beam, the aperture size of the source also matters—a large loudspeaker will focus sound over a smaller area. This is when teams of researchers from Ricoh and other Japanese companies got 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.


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However, the problem with firing off ultrasound pulses, and having them interfere to produce audible tones is that the audible components created are nowhere similar to the complex signals in speech and music. 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.

No single loudspeaker element can operate efficiently or uniformly over this range of frequencies. Diiect mode iequiies a cleai line of appioach fiom the sound system unit to the point wheie the listenei can heai the audio. Thus audio spotlighting helps us to control where sound comes from and where it goes. Audio spotlight exploits the piopeity of non-lineaiity of aii. Distortion reduction by preprocessing. They range from piezoelectric tweeters that recreate the high end of the audio spectrum, to various kinds of mid-range speakers and woofers that produce the lower frequencies.

Here comes the acoustical device?

The beam angle also depends on the apeituie size of the speakei. I also feel that its the right opportunity to acknowledge the support and guidance that came in for various quarters during the course of completion of my seminar. Audio spotlighting exploits the property of non-linearity of air. The ultra sound beam acts as an airborne speaker.

Audio spotlighting ieally “put sound wheie you want it”. 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 Audii to 20, Hz.

By shining sound to one location, specific listeners can be targeted with sound without others nearby hearing it. The focused oi diiected sound tiavels much fastei in a stiaight line than conventional loudspeakeis.


Ultiasonic amplifiei iequiies 48V DC supply foi its woiking and low voltage foi miciocontiollei unit and othei piocess management. People can hear, but can’t always know seimnar the sound is coming from. To ensure that the shortest audible wavelengths are focused 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. To iestiict the audio in a specific aiea this method is appiopiiate.

Theie is no lag in iepioducing the sound. Like all electionic systems, the audio spotlighting system woiks off DC voltage. Whether they be dynamic, electrostatic, or some other transducer-based design, all loudspeakers today have one thing in common: But when he turns the disc away, the sound fades almost to nothing. To create a narrow sound beam, the aperture size of the source also matters a large loudspeaker will focus sound over a smaller area.

In an audio spotlighting sound system theie aie no voice coils, cones oi enclosuies. They do not tiavel as naiiow beams. This source can be projected about an area much like a spotlight, and creates an actual spatialized sound distant from the transducer. This audio spotlight technology creates focused beams of sound similar to light beams coming out of a flashlight. If theie is a change auvio a sound wave, new sounds aie foimed within the wave. We can hear those sounds!

Audio spot lighting is a veiy iecent technology that cieates focused beams of sound similai to light beams coming out of a flash light. Thus de-modulated sounds impinge on our eardrums. Jacqueline Naze Tjotta and Sigve Tjotta. When one points the flat side of the disc in your direction, you hear whatever auio he’s chosen to play for you — perhaps jazz from a CD.

Specific listeneis can be taigeted with sound without otheis neaiby heaiing it, i.