hypersonic sound system full report
Thread Rating:
  • 1 Vote(s) - 3 Average
  • 1
  • 2
  • 3
  • 4
  • 5
project reporter
Active In SP
**

Posts: 45
Joined: Jan 2010
#1
01-02-2010, 12:35 PM



.doc   Hypersonic sound systems.doc (Size: 821.5 KB / Downloads: 357)


ABSTRACT
Hypersonic sound technology from American Technology Corporation employs ultrasonic waves to create audible sound in the air. It works by using harmless ultrasonic tones that we can't hear. These tones use the property of air to create new tones that are within the range of human hearing. The result is audible sound. The acoustical sound wave is created directly in the air molecules by down-converting ultrasonic energy to the frequency spectrum we can hear. Hyper Sonic Sound is produced without the excess baggage of conventional speakers--there are no voice coils, cones, crossover networks, or enclosures. The result is sound with a potential purity and fidelity never before attained.
Sound quality is no longer tied to speaker size. The Hyper Sonic Sound system holds the promise of replacing conventional speakers wherever they are used: in the home, in movie theaters, in automobiles”everywhere. By focusing sound in a tight column, HSS allows you to restrict sound to a specific area without imposing on nearby activities. For example: A series of directory kiosks in a mall require individual audio for each display.
Truly this is a quantum leap, a paradigm shift.
INTRODUCTION
Hyper Sonic Sound (HSS) is a pioneering sound-generation technology that broadcasts your message directly to your intended audience. In contrast to conventional loudspeakers, HSS technology uses a directional ultrasonic column to produce sound exactly where you want it. Sound does not spread to the sides or rear of an HSS unit, eliminating the problem of uncomfortable and unwanted noise pollution produced by conventional speakers. Sound is directed only where it is intended to go. Visualize two people standing four feet apart at an art exhibit. One patron listens to a biography of a sculpture artist, while the other contemplates a painting in complete silence! HSS is like handing someone a set of head phones. By focusing sound in a tight column, HSS allows you to restrict sound to a specific area without imposing on nearby speaker focused on the area in front of only directory users to hear the corresponding audio.
The HSS Directional Audio System can operate in Direct Mode, a clear line of approach from the HSS unit to the target listener, and in Virtual Mode, project and implimentationing sound onto a sign, display or other object creating a Virtual Speaker.
Direct mode
Direct Mode assumes that the listener will be in a direct path in front of the HSS device. He or she will hear the audible sound as the sound column passes by their head. The sound will continue to travel past them until it either strikes a surface or is absorbed by the air (over a long distance). A number of things can happen when a sound wave strikes a surface depending on the surface itself. If the surface is flat and hard (e.g. a mirror or plaster board), the sound will reflect from the surface. Some energy will be lost, but some of the sound will be reflected back into the environment. The angle at which the sound strikes the surface will equal the angle at which it will reflect (assuming a perfect reflector). Of course, there is no perfect reflector so some amount of the sound will scatter back into the entire area, while the loudest portion will follow the refection path. If the surface is absorptive at the proper frequencies, the surface will contain the sound within the surface and little sound will be directed back into the environment. The last alternative is to make the surface
diffusive. If you diffuse the reflection you essentially reflect it back into the room in all directions. Therefore, no single reflection is louder than all the rest.
One of the great benefits of HSS is the fact that we can now predict where the sound will strike a surface (first reflection) and treat that surface accordingly. Since traditional loudspeakers emit sound in all directions, the sound always sounds like it is coming the speaker device because no matter where you are in the room, the first sound you hear is actually coming directly at you from the speaker. Now, with HSS, we only have the one column of sound to deal with. 1) REFLECT IT: Angle the HSS device correctly so that the first reflection is directed where you want it to go. For example, if you donâ„¢t want to hear the first reflection, direct it up into the ceiling, or direct it into a absorptive surface someplace else in the room, etc. Also remember that sound does dissipate over distance. Therefore, the farther you can make the reflection travel, the lower it will be in volume when you hear it again. A good example would be an overhead HSS unit directed down towards the floor with the first reflection going back up into the ceiling. If the ceiling were 50 ft. away, the reflected sound would have to travel 50 ft. up and 50 ft. back down before you would hear it again. It may be completely inaudible by that time depending on how loud it was when it started, the composition of the ceiling, and ambient sound level.
2) ABSORB IT: Make the surface struck by the first sound reflection highly absorptive. The better the absorber, the lower the reflected energy. Carpet, for example, is a very poor absorber. It will absorb some of the highest sound frequencies, but will reflect the remainder. Some office wall panels are somewhat better, but still they will reflect the majority of the energy.
A local acoustical technician can provide you with the most appropriate absorption material for the individual installation.
3) DIFFUSE IT: Make the surface multi-layered and multi- dimensional. The more irregular the surface, the better the diffusion.

Visualizing HSS as a Virtual Speaker
HSS can transform signs, placards, and surfaces into Virtual Speakers. Virtual Mode applications allow units to be placed without cabinet or hardware at the desired sound location. By project and implimentationing sound with an HSS unit, a simple display sign can act as a speaker without wiring or changing the signâ„¢s appearance. You can project and implimentation HSS sound to specific end caps or aisle displays or send sound across the room, without uncomfortable and unwanted volume from loudspeakers. HSS can turn a wall into an information sound center by adding sound to coupon panels and directional signage to increase interest.

Imagine:
Introducing a new product and telling customers how to use it at the store display with the audio message heard only by those standing in front of the display.
- Museums, amusement parks, theme parks, or zoos with display-point audio that provides directions or a narrative about displays or exhibits without the need for conventional headphones.
- Providing a section for the hearing impaired at public assemblies, in churches, and in schools where sound can be enhanced without disruption to other attendees.
- Computer operators in an office of cubicles with HSS units placed overhead directing sound at each individual with no disturbance to coworkers.
- Display booths at trade show that direct sound only to those in or in front of the booth, keeping noise levels to a minimum.
- Projecting the audio from an audio/video conference, in four different
languages from a single central device, reaching the intended parties
without headphones.
- Safety warnings that penetrate general noise in heavy equipment staging areas, rental sites, or repair yards so that it can be heard by those in risk areas.
-Signaling, alerting, and informing specific c individuals in a grocery aisle, waiting room, or lobby.
- Use of the HSS unit to add audio to an ATM with only the customers actually at the ATM able to hear the message.
All this is now possible with the new hypersonic sound systems.
Superior Sound Control
The unique technical characteristics of HSS offer superior control of sound. HSS creates new opportunities for designers to implement and use sound as never before. Architects now have the ability to integrate sound into designs with exciting control of placement. With the HSS Virtual Mode capability, sound can be added without having to place a loudspeaker where the sound is needed. Audio engineers will find that HSS is applicable in any situation where it is desirable to limit the ability to hear sound to a defined space. Since HSS delivers sound precisely, less volume is necessary to project and implimentation sound where it is needed; HSS does not inflict excessive sound pressure at one point to carry the sound to the desired place. HSS can create virtual loudspeakers, so that sound appears to be coming from points where it would be impractical or impossible to place a loudspeaker. Hypersonic Sound is a paradigm shift in sound production based on solid principles of physics.

THE INVENTION

Woody Norris from the American Technology Corporation and the inventor of the Hypersonic Sound Systems.
Woody Norris from the ATC, USA is the inventor of the hypersonic sound systems. He is from the West Coast maverick with no college degree that got most of his formal education during a stint as a radar technician in the USAir Force more than 40 years ago. The holder of a once valuable but long-expired patent on diagnostic ultrasound, the self-taught inventor has made a personal fortune that he estimates is in the tens of millions of dollars by inventing audio devices, including a hearing-aid-sized FM radio, a line of flash-memory voice
recorders and car audio systems, and several models of cell phone headsets. He has been at work on what he calls hypersonic sound for much of the past decade and claims to have invested $40 million in its development.
He had the idea 20 years ago. He was inspired by the working of the color television. The color TV uses only 3 primary colors-red, blue and green. It tricks the eye in to seeing other colors by mixing the primary colors. He decided to apply this same formula in quality sound production. He knew that ultrasonic waves, a far high pitch tone that the ear can detect “ travel farther and stay more focused than waves at lower pitches. So, Norris found a way to make two slightly different ultra sonic waves carry information about a sound, somewhat the way radio waves carry music from a FM station.
When the waves encounter a solid object or person, they slow, distort and crash together. The result is the ultra sonic waves re-create the original sound in the air around the object, so human humans can hear. So, sound from a distant HSS speaker seems like its right at your ears because itâ„¢s actually created fight at your ears. If you step out of the beam, the waves have nothing to distort and, so the inaudible ultra sonic waves slide silently past.
Woody Norris thinks that directional sound has real long-term opportunities, especially when it comes to displacing the ubiquitous loudspeaker, invented more than 80 years ago. Even the best loudspeaker he says, are subject to distortion, and their omni directional sound is annoying to people in the vicinity who donâ„¢t wish to listen. What remains to be seen is if the inventor will become the Alexander Graham Bell of directional sound.
THE DIFFERENCE BETWEEN CONVEVTIONAL AND HSS SPEAKERS
About a half-dozen commonly used speaker types are in general use today. Even the most sophisticated hi-fi speakers have a difficult time in reproducing clean bass, and generally rely on a large woofer/enclosure combination to assist in the task. Whether they are dynamic, electrostatic, or some other transducer-based design, all loudspeakers today have one thing in common: they are direct radiating-- that is, they are fundamentally a piston-like device designed to directly pump air molecules into motion to create the audible sound waves we hear. HSS technology produces sound in the air indirectly as a by-product of some other process.
As electronics have advanced and speaker technology has been pushed to its limits, a whole array of terms has come to define the various forms of distortion associated with the conventional loudspeaker: amplitude distortion, harmonic distortion, inter modulation distortion, phase distortion, crossover distortion, cone resonance, and so forth. Every form of distortion contributed by a loudspeaker is traceable to some aspect of its mechanical nature: mass, magnetic structure, enclosure design, cone construction, etc. All form an important part of the final product's capability to perform its function in as perfect a manner as possible.
Speaker cone motion is subject to the laws of physics. This all-important element, more than any other in a speaker system, affects the overall purity of sound and can be a source of various forms of distortion. Ideally, when reproducing sound, the speaker cone should follow precisely the delicate nuances of any electrical waveform presented to it. The cone or radiating surface of a perfect loudspeaker would have virtually no mass nor resonances over the entire range of hearing, and would offer perfect linearity while at the same time being able to couple enough energy into the air to produce any sound level desired. Hyper Sonic Sound technology does precisely that--it provides linear frequency response with virtually none of the forms of distortion associated with conventional speakers. Traditional speakers work by moving air. Signals fed to the driverâ„¢s voice coil set up a magnetic field, which - in concert with the speaker's permanent magnet - causes the speaker cone to move and, thus, move air. For example, if you feed a pure tone - say, a 1-kilohertz (kHz) sine wave - to a speaker's voice coil, its cone will oscillate back and forth 1000 times per second. The resultant movement of air allows you to hear the 1-kHz tone. Feed a complex signal - for instance, one representing the output of a symphony orchestra - to a speaker's voice coil and the result follows the same principles, but the speaker motion is more complex.
Speakers have inherent limitations that loud speaker manufactures have been striving to overcome ever since the first loudspeaker was invented. Compared with the technological progress made for tuners, amplifiers, and recording/playback equipment and media, speaker technology has moved at a snail's pace. Modern speakers are not much different from those made in the early days. They still suffer from same problems - and there's a good reason why they do.
First, consider that to produce the full audio range (20 Hz to 20 kHz) properly, a speaker is called on to perform as well at one frequency, or tone, as it does at another 1000 times (100,000 percent) higher. No one has invented a single driver that can do that yet, so loudspeakers combine separate drivers (woofer, midrange and tweeter) to reproduce the entire range. It's still not a perfect solution - crossover networks in multidriver loudspeakers introduce their own distortions. Plus, each driver is usually resonant at one frequency (usually the lowest it can reproduce) because of its physical construction, and the enclosure has its own resonant frequency as well. In addition, no loudspeaker can really reproduce the 20-Hz bottom of the audio range. HSS works by emitting a beam of high frequency ultrasonic energy which is converted to an audible acoustic wave in mid-air. An important by-product of the technique is that sound may be project and implimentationed to just about any desired point in the listening environment.
This provides outstanding flexibility, while allowing an unprecedented manipulation of the sound's source point. It helps to visualize HSS technology as a spotlight. You can direct the HSS ultrasonic emitter toward a hard surface, a wall for instance, and the listener perceives the sound as coming
from the spot on the wall. The listener does not perceive the sound as emanating from the face of the transducer, only from the reflection off the wall.
Dispersion of the audio wave front can be tightly controlled by contouring the face of the HSS ultrasonic emitter. For example, a very narrow wave front might be developed for use on the two sides of a computer screen while a home theater system might require a broader wave front to envelop multiple listeners.


HSS Technology Advantages
In a nutshell, the advantages of HSS speakers from conventional loudspeakers can be summarized as follows.
. Focus sound where you want it and no place else
. Revolutionary new concept in sound reproduction - technology paradigm shift
. Ultrasonic emitter devices are thin and flat and do not require a mounting cabinet.
. Its characteristics allow it to perform in ways conventional Loudspeakers cannot.
. The focused or directed sound travels much farther in a straight line than conventional loudspeakers
. Dispersion can be controlled “ very narrow or wider to cover more listening area.

Technology Overview
Range of Hearing
The human ear is sensitive to frequencies from 20 Hz to 20,000 Hz (the "audio" range), and can detect the vibration amplitudes that are comparable in size to a hydrogen atom. If the range of human hearing is expressed as a percentage of shifts from the lowest audible frequency to the highest, it spans a range of 100,000%. No single loudspeaker element can operate efficiently or uniformly over this range of frequencies. In order to deal with this speaker manufacturers carve the audio spectrum into smaller sections. This requires multiple transducers and crossovers to create a 'higher fidelity' system with current technology. Using a technique of multiplying audible frequencies upwards and superimposing them on a "carrier" of say, 200,000 cycles the required frequency shift for a transducer would be only 10%. Building a transducer that only needs to produce waves uniformly over only a 10% frequency range. For example, if a loudspeaker only needed to operate from 1000 to 1100 Hz (10%), an almost perfect transducer could be designed an almost perfect transducer could be designed.




THE WORKING
Basic principle
Hyper Sonic Sound technology creates audible sound from the interaction of two high-frequency signals that are themselves inaudible. A reference signal is held constant at 200 kHz and a variable signal which ranges from 200.020 kHz to 220 kHz are the signals used. The reference signal combines with variable signal to produce audible signal in the air whose frequency is equal to the difference between the variable and reference frequencies. As an example to produce a sound of 263 Hz, the variable signal is made to 200.263 kHz. These ultrasonic frequencies are inaudible by themselves. However, the interaction of the air and ultrasonic frequencies creates audible sounds that can be heard along a column. This audible acoustical sound wave is caused 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". A normal sound wave (like someone talking) is a small pressure wave that travels through the air. As the pressure goes up and down, the "nonlinear" nature of the air itself causes the sound waves to be changed slightly. If you change the sound waves, new sounds (frequencies) are formed within the wave. Therefore, if we know how the air affects the sound waves, we can predict exactly what new frequencies (sounds) will be added into the sufficient volume to cause the air to create these new frequencies. Since we cannot hear the ultrasonic sound, we only hear the new sounds that are formed by the non-linear action of the air. Since the audible sound is produced inside the column of ultrasonic frequencies (which is highly directional), an important by-product of this is that the audible sound can be tightly focused in any direction within the listening environment. This provides outstanding edibility in placing the sound exactly where you want it and substantially eliminating sound in all other areas. The directionality of the HSS system is unsurpassed, with the added benefit of long project and implimentationion distances and retention of intelligibility. Getting sound right where it is wanted eliminates having to use high sound pressure levels to get sound to carry to distant points.

The HSS System
A Hyper Sonic Sound system consists of an audio program source such as a CD player or microphone, an HSS signal processor, and an ultrasonic emitter or transducer that is powered by an ultrasonic amplifier. The music or voice from the audio source is sent to an electronic signal processor circuit where equalization, dynamic range control, distortion control, and precise modulation are performed to produce a composite ultrasonic wave. The wave form is converted to a highly complex ultrasonic signal by the signal processor before being amplified. The patent pending ModAmp„¢ technology is used to produce the compact and lightweight Modulation/Amplifier portions of HSS. This amplified ultrasonic signal is sent to the emitter and emitted into the air to produce a column of ultrasonic sound that is subsequently converted to highly directional audible sound within the air column. Since the ultrasonic energy is highly directional, it forms a virtual column of sound directly in front of the emitter, much like the light from a flashlight. All along that column of ultrasonic sound, the air is creating new sounds (the sound that we originally converted to an ultrasonic wave). Since the sound that we hear is created right in the column of ultrasonic energy, it does not spread in all directions like the sound from a conventional loudspeaker; instead it stays locked tightly inside the column of ultrasonic energy. In order to hear the sound, your ears must be in line with the column of ultrasound, or, you can hear the sound after it reflects off a hard surface. For example, if you point the ultrasonic emitter toward a wall, you will only hear the audible sound after it has reflected off the wall. This is similar to shining a flashlight at a wall in a dark room. You do not see the light from the flashlight; you only see the spot of light on the wall. HSS works the same way, except instead of seeing the spot of light on the wall; you hear the "spot" of sound reflected from the wall. For stereo, a separate ultrasonic emitter is required for each channel of audio, one for the left channel and one for the right channel.


Non-Linearity of Air
When two sound sources are positioned relatively closely together and are of a sufficiently high intensity, two new tones appear: a tone lower than either of the two original ones and a tone which is higher than the original two. There are now four tones where before there were only two. It can be demonstrated mathematically that the two new tones correspond to the sum and the difference of the two original ones, which we refer to as combination tones.
For example, if you were to emit 200,000 Hz and 201,000 Hz into the air, with sufficient energy to produce a sum and difference tone, you would produce the sum - 401,000 Hz - and the difference - 1,000 Hz, which is in the range of human hearing.
The HSS concept originates from this theory of combination tones, a phenomenon known in music for the past 200 years as "Tartan tones." It was long believed that Tartan Tones were a form of beats because their frequency equals the calculated beat frequency. However, it was Hermann von Helmholtz (1821-1894) who completely re-ordered the thinking on these tones. By reporting that he could also hear summation tones (whose frequency was the sum rather than the difference of the two fundamental tones) Helmholtz demonstrated that the phenomenon had to result from a non-linearity. Could a method be found today to utilize this non-linearity of air
molecules in a manner similar to the non-linearity of an electronic mixer circuit?
In theory, the principle appears quite simple. Yet, until now, no one has succeeded in making it work. Nobody has been successful in producing useful levels of sound output in this difference frequency range. ATC ,the makers of the Hyper Sound Systems thinks that better audio can be created with a process that they call acoustic heterodyning - mixing signals together to create new ones - in a process analogous to what virtually every radio receiver uses today.
Mix two signals in a nonlinear medium and you'll end up with four - two at the original frequencies, a third at a new frequency that is equal to the sum of the two signals (the sum frequency) and a fourth at a frequency equal to the difference of the original two signals (the difference frequency).
Radio receivers use heterodyning to make the signals more manageable - the signal is converted to a lower frequency (called the intermediate frequency, or IF) by being mixed with a local oscillator. This allows greater and more consistent amplification of the desired signal because the amplification circuitry can be optimized for only the IF instead of a wide range of frequencies.

What makes acoustic heterodyning possible is that air molecules behave nonlinearly - when sound has a high enough amplitude, the restoring force on the air molecule varies as the square of its displacement from equilibrium - so that mixing can occur. Take an ultrasonic transducer, feed it the right signals, they'll mix, and you'll hear the difference frequency. (The original signals and the sum frequency are outside the range of hearing.)
Acoustic heterodyning can be created by a single transducer or by a pair of transducers. A single transducer would be fed a signal at a "carrier frequency" and a second signal that would provide the desired (audible) difference frequencies when mixed with the carrier. If a pair of transducers was used, one would operate at the carrier frequency and the second at a frequency required producing the desired output. If the carrier frequency of the transducer were 200 kHz, an upward swing of 20 kHz - or just 10 percent - would cover the entire audio range. In theory, this should result in a response that is virtually flat across the audio range - something that no speaker could hope to match. Other benefits include extremely high efficiency when compared with traditional speakers, and - since the sound seems to come from a single point in space - perfect phase coherency.
The audio created by acoustic heterodyning is extremely directional, due to the high frequency of the ultrasonic carrier. In a demonstration of the
technology, we could "shine" the transducer at a wall, and the sound would seem to emanate from there just as if we had hit it with a flashlight beam.
This directionality could be used in a movie theater by generating ultrasounds with separate transducers and swiveling the transducers to change the point where the ultrasound beams would meet, making sound hover or travel over the heads of viewers. Giving directors the ability to put sound exactly where they want it adds a whole new dimension to surround sound. Although acoustic heterodyning has extraordinary promise, don't throw your speakers on the trash heap just yet. In our demonstration, the transducer was only able to create sound equivalent to a small AM transistor radio. It completely lacked a bottom end.
ATC is now working with Carver Corp. to improve the technology's performance to make this audio reproduction revolution a reality. Expect to see some commercial products within a few years.
SPACE SAVER.
It's difficult for any conventional speaker to reproduce the entire spectrum of human hearing, which extends from deep bass notes at 20 hertz (cycles per sound) to shrill 20,000-hz tones. Speaker materials that can make rich bass sounds can't accurately handle high notes. Consequently, speaker boxes typically house two or more speakers, each specializing in narrow tonal ranges. Now, all these complexities go out the window. Norris' little Hyper Sonic speakers aren't troubled by the breadth of human hearing because they operate in a different realm--the ultrasonic. One of the two ultrasonic signals that produce audible sound as a byproduct is a constant 200,000-hz frequency. It's mixed with a second signal that varies from 200,020 Hz to 220,000 Hz. Subtract one from the other, and the resulting tones run the audible gamut.
Basic Benefits
Small Size
Not only has the conventional speaker's crossover network and enclosure been eliminated, but HSS' ultra-small radiating ultrasonic emitter is so small and light-weight that the inertial considerations ordinarily associated with traditional direct-radiation speakers are virtually non-existent. (And so is just about everything else associated with the conventional speaker: the voice coil and support structure normally used to attach the moving cone in place.)
Point Source
The ability to produce the entire audible spectrum of frequencies from a single point source has been the goal of transducer engineers for the past 50 years. The improvement in phase response, time alignment, and frequency response becomes obvious.
Performance
Preliminary testing of the ATC proof-of-concept prototype shows the HSS technology should have the potential for the following performance specifications:
¢ Frequency response from below 10 Hz to 30 kHz
¢ Dynamic range up 120 dB at all frequencies
¢ No crossover networks
¢ Precise phase and time alignment
¢ Room interaction reduced up to 50 dB

APPLICATIONS


of human hearing. As the waves disperse, properties of the air cause them to break into three additional frequencies, one of which you can hear. This sonic frequency gets trapped within the other three, so it stays within the ultrasonic cone to create directional audio. Step into the beam and you hear the sound as if it were being generated inside your head. Reflect it off a surface and it sounds like it originated there. At 30,000 cycles, the sound can travel 150 yards without any distortion or loss of volume. Here's a look at a few of the first applications.

3. Sound Bullets
Jack the sound level up to 145 decibels, or 50 times the human threshold of pain, and an offshoot of hypersonic sound technology becomes a non lethal weapon.
4. Moving movie voices.
for heightened realism, an array of directional speakers could follow actors as they walk across the silver screen, the sound shifting subtly as they turn their heads.
5. Pointed Messages
"You're out too far," a lifeguard could yell into his hypersonic megaphone, disturbing none of the bathing beauties nearby.
6. Discreet Speakerphone
With its adjustable reach, a hypersonic speakerphone wouldn't disturb your cube neighbors.
The following contains a brief list of other uses made possible by HSS:
¢ Museums - describe each exhibit to only the person standing in front of it
¢ Automobiles - HSS announcement device in the dash to beam alert signals directly to the driver
¢ Audio/Video Conferencing - project and implimentation the audio from a conference in four different languages, from a single central device, without the need for headphones.
¢ Paging Systems - direct the announcement to the specific area of interest
¢ Retail Sales - provide targeted advertising directly at the point of purchase
¢ Drive Through Ordering “ intelligible Communications directly with an
automobile driver without bothering the surrounding neighbors
¢ Safety Officials - portable bull horn type device for communicating with
a specific person in a crowd of people .
¢ Military Applications -ship to ship communications, ship-board announcements,
Besides consumer electronics, the entertainment industry is expected to be fundamentally influenced by this development. In a movie theater, sound can be made to emanate directly from an actor's mouth on the screen. Special effects will no longer be limited to the capability of loudspeakers positioned around the auditorium.
You might want to project and implimentation concert sound throughout an audience instead of using huge speaker stacks in front. A small table radio might project and implimentation sound around an entire room. Why not equip your back yard with tightly focused HSS emitters to project and implimentation sound all around your yard for that next pool party.
Until now, it has been difficult for a hearing aid--regardless of price--to reproduce the entire audio spectrum. This no longer need be the case. With HSS, hearing aids may also shrink further in size. Virtual reality, in large-scale applications, has been brought another step closer. No longer is the quality of the sound related to the size or type of a speaker's enclosure. Everywhere and anywhere a speaker is in use today--ships, aircraft, hospitals, automobiles--the HSS technology can replace the bulkier, inefficient speakers, and provide far better results than we have ever heard. Truly, this is a quantum leap, a paradigm shift.
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. This paper discussed about the invention, the inventor, the motive behind the invention, etc. Also discussed about how hypersonic sound is created and how the hypersonic system works, which method is used, etc. What the advantages of hypersonic speakers are, over conventional systems. We also discussed about their wide forms of applications.



REFERENCE
¢ atcsd.com
¢ usatoday.com
¢ acoustic.org
¢ m-media.com
¢ CONTENTS
¢ Introduction 3
¢ Invention 10
¢ Difference between conventional and HSS speakers 12
¢ HSS technology advantages 16
¢ Technical overview 17
¢ The working 18
¢ HSS systems 20
¢ Non linearity property of air 22
¢ Basic benefits 26
¢ Applications 28
¢ Conclusion 32
¢ Reference 33
Reply
aneesh008
Active In SP
**

Posts: 1
Joined: Aug 2010
#2
07-08-2010, 10:20 AM

i need the seminar and presentation report
Reply
seminar class
Active In SP
**

Posts: 5,361
Joined: Feb 2011
#3
07-04-2011, 11:05 AM


PRESENTED BY :
NISHANT V. CHAUDHARI


.ppt   presentation.ppt (Size: 2.79 MB / Downloads: 112)
INTRODUCTION
• INVENTED BY ELWOOD “WOODY” NORRIS OF THE AMERICAN TECHNOLOGY CORPORATION
• HSS TECHNOLOGY IS SIMPLY THE MOST REVOLUTIONARY SOUND REPRODUCTION SYSTEM OF THIS CENTURY
• THIS TECHNOLOGY BREACHES THE DIVIDE BETWEEN "PUBLIC" AND "PRIVATE" SPACE.
TECHNICAL OVERVIEW
• HSS IS AN AUDIO TECHNOLOGY THAT USES THE INTERACTION BETWEEN ULTRASONIC WAVES AND AIR TO GENERATE AUDIBLE SOUND
• HSS EMITTERS DO NOT DIRECTLY GENERATE SOUND WAVES
• HSS IS THE ABILITY TO EMIT SOUND IN NARROW “BEAMS” THAT CAN BE DIRECTED AT A PARTICULAR LOCATION OR INDIVIDUAL
THE WORKING
The air affects the sound waves, we can predict exactly what new frequencies (sounds) will be added into the sufficient volume to cause the air to create these new frequencies. since we cannot hear the ultrasonic sound, we only hear the new sounds that are formed by the non-linear action of the air.
PIECING IT TOGETHER
 With difference tones, the tone that you hear is the difference in Hz of the 2 tones being played. i.e.: 400 + 401 = 1 Hz… 400 + 450 = 50Hz.
 Since humans can’t hear less than 20Hz difference, a difference tone less than 20Hz is perceived as volume fluctuation.
 But, a difference of more than 20Hz is heard as a 3rd tone being played simultaneous to the first 2 tones.
Ultrasound + Difference Tone = Sound
 Even though the 2 tones are ultrasonic, you can still produce difference tones.
 i.e. 60,000Hz and 60,300Hz gives you a 300Hz audible tone.
 Because difference tones only work in non-linear systems, you only hear the tone when it hits your ear, the wall, or some other object
 Since the first two tones are inaudible, however, you only hear the difference tone of 300Hz.
BASIC BENEFITS
• PERFORMANCE
 Frequency response from below 10 Hz to 30 kHz
 Dynamic range up 120 dB at all frequencies
 No crossover networks
 Precise phase and time alignment
 Room interaction reduced up to 50 dB
• SMALL SIZE
 HSS' ultra-small radiating ultrasonic emitter is so small and light-weight
• POINT SOURCE
 Ability to produce the entire audible spectrum of frequencies from a single point source has been the goal of transducer engineers for the past 50 years
Reply
seminar class
Active In SP
**

Posts: 5,361
Joined: Feb 2011
#4
07-04-2011, 11:26 AM

PRESENTED BY:
NISHANT V. CHAUDHARI


.docx   abstract.docx (Size: 259.84 KB / Downloads: 53)
Abstract- Hyper Sonic Sound (HSS) is a pioneering sound-generation technology that broadcasts your message directly to your intended audience. In contrast to conventional loudspeakers, HSS technology uses a directional ultrasonic column to produce sound exactly where you want it. Sound does not spread to the sides or rear of an HSS unit, eliminating the problem of uncomfortable and unwanted noise pollution produced by conventional speakers. Sound is directed only where it is intended to go.
INTRODUCTION
Hypersonic sound technology from American Technology Corporation employs ultrasonic waves to create audible sound in the air. It works by using harmless ultrasonic tones that we can't hear. These tones use the property of air to create new tones that are within the range of human hearing. The result is audible sound. The acoustical sound wave is created directly in the air molecules by down-converting ultrasonic energy to the frequency spectrum we can hear. Hyper Sonic Sound is produced without the excess baggage of conventional speakers--there are no voice coils, cones, crossover networks, or enclosures. The result is sound with a potential purity and fidelity never before attained.
Sound quality is no longer tied to speaker size. The Hyper Sonic Sound system holds the promise of replacing conventional speakers wherever they are used: in the home, in movie theaters, in automobiles—everywhere. By focusing sound in a tight column, HSS allows you to restrict sound to a specific area without imposing on nearby activities. For example: A series of directory kiosks in a mall require individual audio for each display.
Hyper Sonic Sound technology creates audible sound from the interaction of two high-frequency signals that are themselves inaudible. A reference signal is held constant at 200 kHz and a variable signal which ranges from 200.020 kHz to 220 kHz are the signals used. The reference signal combines with variable signal to produce audible signal in the air whose frequency is equal to the difference between the variable and reference frequencies. As an example to produce a sound of 263 Hz, the variable signal is made to 200.263 kHz. These ultrasonic frequencies are inaudible by themselves. However, the interaction of the air and ultrasonic frequencies creates audible sounds that can be heard along a column. This audible acoustical sound wave is caused 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". A normal sound wave (like someone talking) is a small pressure wave that travels through the air. As the pressure goes up and down, the "nonlinear" nature of the air itself causes the sound waves to be changed slightly. If you change the sound waves, new sounds (frequencies) are formed within the wave. Therefore, if we know how the air affects the sound waves, we can predict exactly what new frequencies (sounds) will be added into the sufficient volume to cause the air to create these new frequencies. Since we cannot hear the ultrasonic sound, we only hear the new sounds that are formed by the non-linear action of the air. Since the audible sound is produced inside the column of ultrasonic frequencies (which is highly directional), an important by-product of this is that the audible sound can be tightly focused in any direction within the listening environment. This provides outstanding edibility in placing the sound exactly where you want it and substantially eliminating sound in all other areas. The directionality of the HSS system is unsurpassed, with the added benefit of long project and implimentationion distances and retention of intelligibility. Getting sound right where it is wanted eliminates having to use high sound pressure levels to get sound to “carry” to distant points.
TECHNOLOGY OVERVIEW
Range of Hearing
The human ear is sensitive to frequencies from 20 Hz to 20,000 Hz (the "audio" range), and can detect the vibration amplitudes that are comparable in size to a hydrogen atom. If the range of human hearing is expressed as a percentage of shifts from the lowest audible frequency to the highest, it spans a range of 100,000%. No single loudspeaker element can operate efficiently or uniformly over this range of frequencies. In order to deal with this speaker manufacturers carve the audio spectrum into smaller sections. This requires multiple transducers and crossovers to create a 'higher fidelity' system with current technology. Using a technique of multiplying audible frequencies upwards and superimposing them on a "carrier" of say, 200,000 cycles the required frequency shift for a transducer would be only 10%. Building a transducer that only needs to produce waves uniformly over only a 10% frequency range. For example, if a loudspeaker only needed to operate from 1000 to 1100 Hz (10%), an almost perfect transducer could be designed an almost perfect transducer could be designed.
A Hyper Sonic Sound system consists of an audio program source such as a CD player or microphone, an HSS signal processor, and an ultrasonic emitter or transducer that is powered by an ultrasonic amplifier. The music or voice from the audio source is sent to an electronic signal processor circuit where equalization, dynamic range control, distortion control, and precise modulation are performed to produce a composite ultrasonic wave. The wave form is converted to a highly complex ultrasonic signal by the signal processor before being amplified. The patent pending ModAmp™ technology is used to produce the compact and lightweight Modulation/Amplifier portions of HSS. This amplified ultrasonic signal is sent to the emitter and emitted into the air to produce a column of ultrasonic sound that is subsequently converted to highly directional audible sound within the air column. Since the ultrasonic energy is highly directional, it forms a virtual column of sound directly in front of the emitter, much like the light from a flashlight. All along that column of ultrasonic sound, the air is creating new sounds (the sound that we originally converted to an ultrasonic wave). Since the sound that we hear is created right in the column of ultrasonic energy, it does not spread in all directions like the sound from a conventional loudspeaker; instead it stays locked tightly inside the column of ultrasonic energy. In order to hear the sound, your ears must be in line with the column of ultrasound, or, you can hear the sound after it reflects off a hard surface. For example, if you point the ultrasonic emitter toward a wall, you will only hear the audible sound after it has reflected off the wall. This is similar to shining a flashlight at a wall in a dark room. You do not see the light from the flashlight; you only see the spot of light on the wall. HSS works the same way, except instead of seeing the spot of light on the wall; you hear the "spot" of sound reflected from the wall. For stereo, a separate ultrasonic emitter is required for each channel of audio, one for the left channel and one for the right channel.
APPLICATIONS
In a nutshell, the advantages of HSS speakers from conventional loudspeakers can be summarized as follows.
. Focus sound where you want it and no place else
. Revolutionary new concept in sound reproduction - technology paradigm shift
. Ultrasonic emitter devices are thin and flat and do not require a mounting cabinet.
. Its characteristics allow it to perform in ways conventional Loudspeakers cannot.
. The focused or directed sound travels much farther in a straight line than conventional loudspeakers
. Dispersion can be controlled – very narrow or wider to cover more listening area.
The applications are many, from targeted advertising to virtual rear-channel speakers. The key is frequency: The ultrasonic speakers create sound at more than 20,000 cycles per second, a rate high enough to keep in a focused beam and beyond the range of human hearing. As the waves of human hearing. As the waves disperse, properties of the air cause them to break into three additional frequencies, one of which you can hear. This sonic frequency gets trapped within the other three, so it stays within the ultrasonic cone to create directional audio. Step into the beam and you hear the sound as if it were being generated inside your head. Reflect it off a surface and it sounds like it originated there. At 30,000 cycles, the sound can travel 150 yards without any distortion or loss of volume. Here's a look at a few of the first applications.
1. Virtual Home Theater
2. Targeted Advertising
3. Sound Bullets
4. Moving movie voices
5. Pointed Messages
6. Discreet Speakerphone

Reply

Important Note..!

If you are not satisfied with above reply ,..Please

ASK HERE

So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page

Quick Reply
Message
Type your reply to this message here.


Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  digital image processing full report computer science technology 40 47,778 08-03-2014, 12:52 PM
Last Post: aumsree
  solar power satellite full report computer science technology 30 33,680 28-02-2014, 07:01 PM
Last Post: sandhyaswt16
  electronic nose full report project report tiger 15 17,851 24-10-2013, 11:23 AM
Last Post: Guest
  smart pixel arrays full report computer science technology 5 8,105 30-07-2013, 05:10 PM
Last Post: Guest
  smart antenna full report computer science technology 18 22,596 25-07-2013, 01:55 PM
Last Post: livon
  speed detection of moving vehicle using speed cameras full report computer science technology 14 22,669 19-07-2013, 04:40 PM
Last Post: study tips
  speech recognition full report computer science technology 17 22,853 14-05-2013, 12:28 PM
Last Post: study tips
  global system for mobile communication full report computer science technology 9 8,522 06-02-2013, 10:01 AM
Last Post: seminar tips
  satrack full report computer science technology 10 17,505 02-02-2013, 10:53 AM
Last Post: seminar tips
  Wireless Battery Charger Chip for Smart-Card Applications full report project topics 8 7,576 28-01-2013, 03:02 PM
Last Post: varna prasad