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A.Sanyasi RaoAssoc. Prof & HoD

Dept. of ECE, BIES

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INTRODUCTION

The annoying loudspeaker may soon be replaced with therevolutionary hypersonic sound system.

It will beam sound whenever you want it without disturbing

other.

HSS technology produces sound in the air indirectly and

provides greater control of sound placement and volume.

Hyper sonic sound system technology provides significant

departure from conventional speakers and a remarkable

approach to the reproduction of sound.

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BLOCK DIAGRAM OF HSS

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The Technology

Hypersonic sound Technology

works by emitting Harmless

high frequency Ultrasonic

tones that we can not hear.

These tones use the

property of air to create newtones that are within the

range of human hearing the

result is an audible sound

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The sound is generated in the air

itself, indirectly, as a conversionby product of the interaction ofultrasonic waves.

The acoustic sound wave iscreated directly in the air

molecules by down convertingultrasonic energy into thefrequency spectrum we can hear.

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If we move two tones

beyond the range of

hearing.

In fig. 40 and 41KHz are

the frequencies which are

not in the human hearingrange.

Sum of this we can not

hear.

Difference of this we canhear.

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WORKING OF HSS

HSS works on

nonlinearity property. A

normal sound wave is a

small pressure wavethat travels through the

air. As the pressure

goes up and down thenonlinear nature of the

air itself slightly

changes the sound.

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Hypersonictechnology is

analogous to sameas beam of lightfrom a flash light.

As in the picturesound can be heardonly by the personwho is under thetarget with outdisturbing others.

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MODES OF LISTENING

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ADVANTAGES

Can focus sound only at the place where youwant it.

Ultrasonic emitter device are thin and flat and donot require a mounting cabinet.

The focused or directed sound travels muchfarther in a straight line than conventional

loudspeakers

Dispersion can be controlled very narrow orwider to cover more listening area.

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APPLICATIONS

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PROPERTY

Directivity Omni directional Directional

Impedance Low impedanceSuper high impedance.

Fidelity vs. size Sound quality directlyproportional to size.

Sound qualityindependent of speakersize.

Price The price is reasonable Presently cost is veryhigh(1000- 2000$)

Frequency range Many speakers are neededto cover 20 20000hz.

Large band width withnear flat response

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FUTURE OF SOUND

The hypersonic sound system holds thepromise of replacing conventional speaker.

Ultrasonic emitter have super highimpedance which lows current in poweramplifier making them lighter of weight.

The HSS system is going to shape thefuture sound and will serve our earsmagical experience.

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