audio spotlighting ieee paper downloads
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ieee research papers on audio spotlighting
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Abstract

Point-in-time audio illumination is a very recent technology that creates focused sound beams similar to the rays of light coming from a flashlight. Through the "bright" sound in one place, specific listeners can focus on the sound without others hearing it. It uses a combination of non-linear acoustics and some sophisticated mathematics. But it's real and it's okay to hit the socks of any conventional speaker. This acoustic device comprises a loudspeaker that triggers inaudible ultrasound pulses with a very small wavelength that acts in a manner very similar to that of a narrow column. The ultrasonic beam acts as an overhead loudspeaker and, as the beam moves through the air, the gradual distortion occurs in a predictable manner due to the property of nonlinearity of the air. This results in audible components that can be accurately predicted and precisely controlled. Joseph Pompei's Holosonic Research Labs invented the Audio Spotlight, which consists of a sound processor, an amplifier and the transducer. The American Technology Corporation developed the directed audio sound system based on Hyper Sonic sound. Both use ultrasound-based solutions to transmit sound in a focused beam. The audio projector can be directed to a particular listener or to a point where it is reflected

Introduction

Point-in-time audio illumination is a very recent technology that creates focused sound beams similar to the rays of light coming from a flashlight. By "illuminating" the sound in one location, specific listeners can focus on the sound without others hearing it, that is, focusing the sound in a coherent, highly directional beam. It uses a combination of non-linear acoustics and some sophisticated mathematics. But it's real and it's okay to hit the socks of any conventional speaker. The Audio Spotlight & Hyper Sonic Sound technology (developed by American Technology Corporation) uses ultrasonic energy to create extremely narrow sound beams that behave like light beams. Audio illumination exploits the property of non-linearity of air. When inaudible ultrasound pulses are fired into the air, it spontaneously converts inaudible ultrasound into audible sounds, thus demonstrating that, as with water, the propagation of sound in air is not linear and can be calculated mathematically . A device known as a parametric matrix employs the non-linearity of air to create audible byproducts from inaudible ultrasound, which results in an extremely directive and beam-shaped broadband acoustic source. This source can be projected over an area very similar to a reflector, and creates a specialized real sound away from the transducer. The ultrasound column acts as an overhead loudspeaker and, as the beam moves through the air, the gradual distortion takes place in a predictable manner. This results in audible components that can be accurately predicted and precisely controlled
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