hypersonic sound system full report

[seminar class]

PRESENTED BY :
NISHANT V. CHAUDHARI

---

[attachment=11829]
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