07-04-2011, 11:26 AM
PRESENTED BY:
NISHANT V. CHAUDHARI
[attachment=11833]
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 projection 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
NISHANT V. CHAUDHARI
[attachment=11833]
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 projection 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
