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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. The ultrasound column acts as airborne speaker, and as the beam moves through the air gradual distortion takes place in a predictable way.
Highly focused announcement in noisy enviionments such as subways, aiipoits, amusement paiks, tiaffic inteisections etc.
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 2O kHz will be pioduced within the ultiasonic sound wave. Engineeis have stiuggled foi audik a centuiy to pioduce a speakei design with the ideal 2OHz 2O,OOOHz capability of human heaiing and also pioduce a naiiow beam of audible sound.
Audio Spotlighting Complete – [PDF Document]
This effectively means the sound that you hear will be propagated through air equally in all directions. 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. It makes use of non-lineaiity piopeity of aii.
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Nonlinear interaction of two collinear, spherically spreading sound beams. Thus audio spotlighting helps us to control where sound comes from and where it goes.
The ultrasound column acts as an airborne speaker, and as the beam moves through the air, gradual distortion takes place in a predictable way. However, the problem spotlightijg 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. I shall acknowledge with any such errors if pointed out.
Audio Spotlighting Complete
Pioect the audio fiom a zpotlighting in foui diffeient languages, foima single cential device without the need foi headphones. They do not travel as narrow beams which is why you don? 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 spolighting transducers- based design.
Post, and Mark F. This source can be projected about an area much like a spotlight, and creates an actual spatialized sound distant from the transducer.
Are you interested in any one of this Seminar, Rfport Topics. It uses ultiasonic eneigy to cieate extiemely naiiow beams of sound that behave like beams of light. Joseph Pompei while a graduate student at MITwho is the master brain behind the development of this technology.
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In semina audio spotlighting zudio system theie aie no voice coils, cones oi enclosuies. Audio spotlight can be either directed at a particular listener or to a point where it is reflected. Diiect mode iequiies a cleai line of appioach fiom the sound system unit to the point wheie the listenei can heai the audio. The audio signal is sent to electionic signal piocessoi ciicuit wheie equalization and distoition contiol aie peifoimed in oidei to pioduce a good quality sound signal.
The beam angle also depends on the apeituie size of the speakei. This requires multiple transducers and crossovers to create a ‘higher fidelity’ system with current technology.
To create a narrow sound beam, the aperture size of the source also matters a large loudspeaker will focus sound over a smaller area. The problem here is that this is not a very practical solution. Prnjcctcd nr Virtual mndc: This mode iequiies an unbioken line of appioach fiom the emittei of audio semonar system, so the emittei is pointed at the spot wheie the is to be heaid.
Jacqueline Naze Tjotta and Sigve Tjotta. The audible portions of sound tend to spread out in all directions from the point of origin. The listenei does not peiceive the sound as emanating fiom the face of the tiansducei, but only foim the ieflection of the wall.
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 reprt loudspeakers are needed. Even aftei tiaveling a distance of 1Om the beam coveis only an aiea of 3. A viitual sound souice cieates an illusion of sound souice that emanates fiom a suiface oi diiection wheie no physical loudspeakei is piesent.
The pioblem heie is that this is not a veiy piactical solution, thus the low beam angle can be achieved only by making the wavelength smallei and this can be achieved by making use of ultiasonic sound.
The smallei the wavelength, less seminr beam angle and hence, the moie focused the sound. 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. 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.
Whether they be dynamic, electrostatic, or some other transducer-based design, all loudspeakers today have one thing in common: The Audio spotlight developed by Ameiican Technology Coipoiation uses ultiasonic eneigy to cieate extiemely naiiow beams of sound that behaves like beam of light. Specific listeners can be targeted with sound without other hereby hearing it, i.
Parametric array in air: About a half-dozen commonly used speaker types are in general use today.