When you listen to sound over loudspeakers, you don't have any control over where the sound goes. Sometimes you don't want it to go everywhere. Scientists have devised a way to solve that problem. They have figured out how to "steer" sounds by aiming them only where he wants them to go with a device they call Audio Spotlight.
Conventional loudspeakers suffer from amplitude distortions, harmonic distortion, inter – modulation distortion, phase distortion, crossover distortion, cone resonance etc. In nature, sound travels in waves spreading in every direction, bouncing off some surfaces and being absorbed by others. It is certainly not linear. It helps to visualize the traditional loudspeaker as a light bulb. As with the light bulb, a traditional loudspeaker radiates sound fairly uniformly in all directions. A listener can stand anywhere in an acoustical environment and point to the speaker as the source of the sound.
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2. • Introduction
• Range of hearing
• Working…
• Block diagram
• Modes of listening
• Advantages and Disadvantages
• Applications
3. • A technology that creates focused beams of sound similar
to light beams coming out of a flashlight
• Invented by the founder of Holosonics Labs, Dr. F. Joseph
Pompei in 1998
10. • Human ear - 20 Hz to20,000Hz.
• No single loud speaker can operate efficiently over
such wide range of frequencies.
FIG.4:-SHOWING THE DIFFERENCE IN MODULATING AUDIBLE FREQUENCIES WITH
ULTRASONIC CARRIER
Audio Spectrum
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18. here are two modes of
listening:
• Direct Mode
• Projected Mode
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20. • Lack of mass production. i.e., each unit must be
handmade
• The most common form of distortion is clipping
• It's highly costly.
21. • Small size
• Single source
• Ultimate control in audio placement
• Minimizes noise pollution
• Ease of installation
• Reduced feedback
