AJAY KRISHNAN P V S3 ECE ROLL NO 6

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Presentation transcript:

AJAY KRISHNAN P V S3 ECE ROLL NO 6

What is Audio spotlighting..? Audio spotlighting is a very recent technology that creates a focussed beams of sound similar to light beams coming out of a flashlight. Specific listeners can be targeted with sound without others nearby hearing it.

Is it possible to confine sound to a small area..??

If yes, How…?? By decreasing wavelength of the sound beams(λ α Beam angle) Thus uses ultrasonic energy to creates extremely narrow beams of light By increasing the aperture size of the speakers

A Comparison between Conventional Speakers and Audio Spotlighting

Working Principle Frequency modulated signal travel through air , non linearity property of air comes into action which slightly changes the sound waves. Due to change in sound waves new sounds are formed within the waves. New signal corresponds to the orginal information signal in the range 20 Hz to 20000 Hz. Inherent non linearity of air works as a demodulator and thus demodulated sounds impringe on our ear drums. We can hear those sounds.

Advantages Can focus sound only at the specific place you want. Focussed and directed sound waves travels much faster. Highly cost effective and longer life span. Requries same power as required for regular speakers. Dispersion can be controlled. No lag in reproducing the sound.

Applications RETAIL SALES: Provide directly advertising at the time of purchase MUSEUMS: In museums audio spotlight can be used to describe about a particular object to a person standing in front of it.

Applications(contd.) SAFETY OFFICIALS: Portable audio spot lighting devices for communicating with a specific person from a crowd of people. ENTERTAINMENT SYSTEMS: In home theatre systems sound can be improved by implementing audio spotlighting system. PUBLIC ANNOUNCEMENTS: Highly focussed announcements in a noisy environment airports, subways, traffic intersections etc. NAVY APPLICATION: Ship to ship communication and shipboard announcements.

Let me conclude…. “REAL BOON FOR FUTURE” Even the best loudspeakers are subject to distortion and their omni direction sound is annoying to the people in the vicinity who do not wish to. The audio spot light will force people to rethink their relationship with sound. Audio spotlighting really “PUT SOUND WHERE YOU WANT IT” and will be a “REAL BOON FOR FUTURE”