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I am also obliged to the faculty of Electrical srminar Electronics Department, for giving me their timely suggestions in my venture. Above all I express my thanks reeport Almighty for the blessings showered on me which leads to the successful completion of this work.
This requires multiple transducers and crossovers to create a ‘higher fidelity’ system with current technology. 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. This souice can pioected about an aiea much like a spotlight and cieates an actual specialized sound distant fiom a tiansducei. Sound quality is no longei tied to speakei size.
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. Audio spotlight looks like a disc-shaped loudspeaker, trailing a wire, with a small laser guide-beam mounted in the middle.
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. Both use ultrasound based solutions to beam sound into a focused beam.
In order to deal with this speaker manufacturers carve the audio spectrum into smaller sections. The ultrasound column acts as airborne speaker, and as the beam moves through the air gradual distortion takes place in a predictable way. 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. 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.
If theie is a change in a sound wave, new sounds aie foimed within the wave. The smaller the wavelength, the less the beam angle, and hence, the more focused the sound.
Ultiasonic amplifiei iequiies 48V DC supply foi its woiking and low voltage foi miciocontiollei unit and othei piocess management.
Holosonic Research Labs invented the Audio Spotlight that is made of a sound processor, an amplifier and the transducer. Audio spotlighting woiks by emitting haimless high fiequency ultiasonic tones that human heai cannot heai.
Ultiasonic emittei devices aie thin and flat and do not iequiie a mounting cabinet. The problem here is that this is not a very practical solution. We can hear those sounds! Human speech, as well as music, contains multiple varying frequency signals, which interfere to produce sound and distortion. Theie is no lag in iepioducing the sound. This sound system holds the piomise of ieplacing conventional speakeis in homes, movie theateis and automobile eveiywheie.
The audible portions of sound tend to spread out in all directions from the point of origin. Download your Full Reports for Audio Semihar.
Download the Seminar Report for Audio Spotlighting
Being the most recent and dramatic change in the way we perceive sound, audio spot light technology can do many miracles in various fields like, Home theatre audio system, Navy and military applications, museum displays etc. Can focus sound only at the place you want. In fact, the beam angle of audible sound is very wide, just about degrees.
Thus de-modulated sounds impinge on our eardrums. Parametric array in air: In oidei to conveit the souice signal mateiial into ultiasonic signal a modulation scheme is iequiied which is achieved thiough a modulatoi.
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. This use ultrasound based solutions to beam sound into a focused beam. Diiect mode iequiies a cleai line of appioach fiom the sound system unit to the point wheie the listenei can heai the audio. Here comes the acoustical device?
Audio spotlight can be either directed at a particular listener or to a point where it is reflected.
Audio Spotlighting | Seminar Report, PPT, PDF for ECE Students
audii Specific listeners can be targeted with sound without other hereby hearing it, i. Journal of the Audio Engineering Society, P. Specific listeneis can be taigeted with sound without otheis neaiby heaiing it, i.
Home Documents Audio Spotlighting Complete. 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 swminar carrier wave, and superimposing audible speech and music signals on it to create a hybrid wave.
This effectively means audip sound that you hear will be propagated through air equally in all directions. 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.
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.
Human speech, as well as seinar, contains multiple varying frequency signals, which interfere to produce sound and distortion. Inan aiticle cited the nonlineai effects occuiiing in aii. In fact, semnar beam angle of audible sound is very wide, just about degrees. Audio spotlight exploits property of non-linearity of air.