Audio beam : a new type of loudspeaker design
Audio Beam is a revolutionary way of projecting audio signals in a highly directional manner to the listener. Instead of using conventional large loudspeaker arrays for projecting a narrow sound beam to the listener, this new technique creates the same narrow beam by amplitude-modulating the audio s...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Research Report |
| Published: |
2008
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/2855 |
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| Institution: | Nanyang Technological University |
| Summary: | Audio Beam is a revolutionary way of projecting audio signals in a highly directional manner to the listener. Instead of using conventional large loudspeaker arrays for projecting a narrow sound beam to the listener, this new technique creates the same narrow beam by amplitude-modulating the audio signal with a finite amplitude ultrasonic carrier wave and then transmitting the resultant signal from an array of ultrasonic transducers across the air to the listener. As a result, an audio signal is automatically produced by the self-demodulation effect of the amplitude-modulated sound wave in the air, without the aid of any hearing device. With this nonlinear interaction, we develop a new type of loudspeaker capable of controlling the direction of the transmitted audio signal. |
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