audio spotlighting

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INTRODUCTION

It is the Production of focused beams of Sound

Combination of Non-Linear Acoustics & Fancy Mathematics.

Uses Ultra-sonic Energy to create Narrow beams of sound

Non Linearity of the air aid the device for its working

Devices used: Parametric Array, CMUTs



To Focus Sound into Narrow Beam
.A low beam angle
Smaller the wave length, Lesser the beam angle.
.Large aperture size
Increase aperture size of speakers
(10m dia for 20Hz) - practically difficult.



Properties of ultrasound:

The frequency ranges above 20 KHz

The wavelength is less than 2crn

Small beam angle hence highly coherent and directional.



COMPONENTS AND SPECIFICATIONS


.Audio Spotlight consists of three major components:
1. A Thin, Circular Transducer Array.
2. A Signal Processor .
3. An Amplifier.
.Works with principle of Non Linearity of Air