Acoustic heterodyne device and method

H - Electricity – 04 – R

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Details

H04R 23/00 (2006.01) G10K 15/02 (2006.01) H04B 11/00 (2006.01) H04R 3/02 (2006.01) H04R 5/033 (2006.01) H04S 1/00 (2006.01) H04R 5/02 (2006.01)

Patent

CA 2261108

The present invention is the emission of new sonic or subsonic compression waves from a resonant cavity (80) as a result of interference of at least two ultrasonic wave trains (30, 32). In one embodiment, two ultrasonic emitters (20) are oriented toward the cavity. When the difference in frequency between the two ultrasonic wave trains is in the sonic or subsonic frequency range, a new sonic or subsonic wave train of that frequency is emitted from within the cavity or region of interference in accordance with the principles of acoustical heterodyning. The preferred embodiment is a system comprised of a single ultrasonic radiating element oriented toward the cavity emitting multiple waves.

Cette invention concerne l'émission de nouvelles ondes de compression soniques ou subsoniques à partir d'une cavité résonante (80) du fait des interférences d'au moins deux trains d'ondes ultrasonores (30, 32). Dans une forme de réalisation deux émetteurs (20) d'ultrasons sont orientés vers la cavité. Quand la différence de fréquence entre les deux trains d'ondes ultrasonores se situe dans la plage de fréquences soniques ou subsoniques, un nouveau train d'ondes soniques ou subsoniques, de cette même fréquence est émis depuis l'intérieur de la cavité ou zone d'interférences selon les principes du changement de fréquence acoustique. Le mode de réalisation préféré se présente sous forme d'un système constitué d'un unique élément rayonnant ultrasonique orienté vers la cavité émettant une pluralité d'ondes.

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