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This effectively means the sound that you hear will be propagated through air equally in all directions.

Audio spotlight can be either directed at a particular listener or to a point where it is reflected. To create a narrow sound beam, the aperture size of the source also matters—a large loudspeaker will focus sound over a smaller area.

Engineers have struggled for nearly a century to produce a speaker design with the ideal 20Hz ,Hz capability of human hearing and reeport produce narrow beam of audible sound. But when he turns the disc away, the sound fades almost to nothing.

Airborne ultrasounds of 28 kHz are envelope-modulated with audio signals. The smaller the wavelength, the less the beam angle, and hence, the more focused the sound.

In order to deal with this speaker manufacturers carve the audio spectrum into smaller sections. The mounting hardware is constructed with a ball joint so that the Audio Spotlights are easily aimed wherever the sound is desired.

For the maximum volume sound level that trade show use spotlighging, 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.

By using a DSB modulatoi the modulation index can be ieduced to deciease distoition. In home theatie system ieai speakeis can be eliminated by the implementation of audio spotlighting and the piopeities of sound can be impioved. A spotligyting known as paiametiic aiiay employs the non-lineaiity of the aii to cieate audible by pioducts fiom inaudible ultiasound, iesulting in extiemely diiective and beam like sound. 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.


The Audio spotlight developed by American Technology Corporation uses Ultrasonic energy to reprt extremely narrow beams of sound that behaves like beam of light. The fiequency oscillatoi geneiates ultiasonic fiequency signals in the iange of 21,OOO Hz to 28,OOO Hz which is iequiied foi the modulation of infoimation signals.

Rpeort audio spotlight technology creates focused beams of sound similar to light beams coming out of a flashlight.

Audio Spotlighting | Seminar Report, PPT, PDF for ECE Students

Distortion reduction by preprocessing. Post, and Mark F. Psotlighting Pompei while a graduate student at MITwho is the master brain behind the development of this technology. To ensure that the shortest audible wavelengths are focused spotpighting 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. No single loudspeakei element can opeiate efficiently ovei such a wide iange of fiequencies.

This gives rise to audible components that can be accurately predicted and precisely controlled. The new sound signal geneiated within the ultiasonic sound wave will be coiiesponding to the oiiginal infoimation signal with a fiequency in the iange of 2O Hz to semijar kHz will be pioduced within the ultiasonic sound wave. Sound quality is no longei tied to speakei size.

Audio Spotlighting Complete

In order to focus sound into a narrow beam, you need to maintain a low beam angle that is dictated by wavelength. They do not travel as narrow beams which is why you don? This source can projected about an area much like a spotlight and creates an actual specialized sound distant from a transducer.

The audible poitions of sound tend to spiead out in all diiections fiom the point of oiigin. In fact the beam angle spotlightinv audible sound is veiy wide, ust about 36O degiees. 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.


By using Audio spotlight – which concentrates the sound just as a spotlight does so only those in the “beam” can hear your message. A dedicated miciocontiollei ciicuit takes caie of the functional management of the system.

Highly focused announcement in noisy enviionments such as subways, aiipoits, amusement paiks, tiaffic inteisections etc.

In this technology we can? It allows the usei to contiol the diiection of piopagation of sound. The ultrasound column acts as airborne speaker, and as the beam moves through the air gradual distortion takes place in a predictable way.

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This souice can pioected about an aiea much like a spotlight and cieates an actual specialized sound distant fiom a tiansducei. Dispeision can be contiolled veiy naiiow oi widei to covei moie listening aiea.

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The problem here is that this is not a very practical solution. Audio spotlight looks like a disc-shaped loudspeaker, trailing a wire, with a small laser guide-beam mounted in the middle. Specific listeneis can be taigeted with sound without otheis neaiby heaiing it, i. The ultrasound column acts as an airborne speaker, and as the beam moves through spotlightijg air, gradual distortion takes place in a predictable way. 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.

This technology is similai in that you can diiect the ultiasonic emittei towaids a haid suiface, a wall foi instance and the repotr peiceives the sound as repprt fiom the spot on the wall. They do not tiavel as naiiow beams. Ultiasonic amplifiei iequiies 48V DC supply foi its woiking and low voltage foi miciocontiollei unit and othei piocess management. Inan aiticle cited the nonlineai effects occuiiing in aii.