HYPERSOUND SPEAKER

Prepared by Jesbin Jose Electrical & Electronics Engineering Roll no : 25 Reg no: 13030600 GPTC Perinthalmanna

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INTRODUCTION

HSS is a pioneering sound-generation technology Developed from American Technology Corporation(ATC) It works by using harmless ultrasonic tones that we can't

hear Sound is directed only where it is intended to go. Sound does not spread to the sides, eliminating the

problem of uncomfortable and unwanted noise pollution produced by conventional speakers.

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WHAT ISHYPER SONIC SOUND

Hypersonic sound is based on ultrasonic waves. It is not audible by human hears. It’s like open light bulb & flash light bulb It use the Non-linearity property of air

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Fig- 1

HISTORY OF HSS

HSS concept is given by -Herman Von helmboltz(1821) 1960-Attempt HSS in Under water sonar 1970-Mathematically proves for HSS in air 1996-First attempt of HSS started(Good quality) 1998-audio spot light by F.Joseph pompei Now using HSS by “Woddy norris”

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Fig- 2

ULTRASONIC SOUND WAVES

Sound waves which humans can’t hear Frequency above 20khz Used in sonography,detect invisible flaws,and for

cleaning

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Fig- 3

FREQUENCY RANGES

The human ear is sensitive to frequencies from 20 Hz to 20 kHz

No single loudspeaker element can operate efficiently over this range of frequencies

In HSS two signals are used a) Reference signal (held constant at 200 kHz) b) Variable signal (ranges from 200.020 kHz to 220 kHz) These two combine to produce audible signal

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WORKING

These ultrasonic frequencies are inaudible by themselves

The interaction of the air and ultrasonic frequencies creates audible sounds

It occur when the air down converts the ultrasonic frequencies to the lower frequency spectrum that humans can hear.

The basic operating principal of HSS uses a property of air known as "non-linearity"

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NON-LINEARITY OF AIR creates new waves within another wave by the

continuous expansion and contraction of waves As the pressure goes up and down, the "nonlinear"

nature of the air itself causes the sound waves to be changed slightly

If we know how the air affects the sound waves, we can predict exactly what new frequencies will be added into the sufficient volume to cause the air to create these new frequencies

Since we only hear the new sounds that are formed by the non-linear action of the air

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HSS SYSTEM ARCHITECTURE

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Fig- 4

HSS SYSTEM ARCHITECTURE

SMPS Microcontroller unit Audio signal processing unit Digital audio pre-amp

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Fig 5

HSS SYSTEM ARCHITECTURE

Variable Carrier Frequency Oscillator (VCFO) Dynamic DSB Modulator Ultrasonic Power Amplifier Monolithic Film Transducers

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Fig- 6 Fig- 7

CONNECTION SETUP 12

NEED OF HSS

Due to the increase in noise pollution Conventional loudspeakers can replace by HSS Saves space for a loudspeaker Increase concentration level immersive 3-D effect without any headphones

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Fig- 9

APPLICATIONS OF HSS

Automobile Audio video conferrence Military application parks

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Fig- 8

Fig- 9

Fig- 10

APPLICATIONS OF HSS

Museum Virtual Home Theater Targeted Advertising Pointed Messages Decoration

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Fig- 11

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WHY IT IS BETTER THAN TRADITIONAL SYSTEM

Shot tightly focused wave Highly directional has long distance Smaller in size No cross over network Simple to handle

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Fig- 14

ADVANTAGES

Highly focused directional audio Very thin and light weight transducer used as ultrasonic

emitter The sound only can hear within a particular angle Provide HD real audio for virtual reality (virtual real audio

processing is possible) Support multi channel audio

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DISADVANTAGES

High operating voltage required as compared to normal audio amplifier

Minimum stereo quality sound input required for the proper working

High manufacturing cost

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CONCLUSION

As a conclusive remark, this paper discussed About the coming of the Hypersonic Speaker Systems which are yet not implemented, but is a real promising innovation which may be applied in our everyday life and will revolutionize the sound technology.

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ANY QUESTIONS? 20

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