Omnidirectional ultrasonic communication system
First Claim
1. An ultrasonic communication system including an omnidirectional transducer, the transducer comprising:
- a housing having a closed side and an open side defining an aperture in the housing; and
a diaphragm mounted into the housing to form a sealed cavity between a first side of the diaphragm and the closed side of the housing, a second side of the diaphragm being free to transmit ultrasonic signals through the aperture;
the diaphragm and aperture both have a largest dimension that is less than or equal to one-quarter wavelength of an ultrasonic signal to be transmitted by the transducer, such that the transducer behaves as a monopole and radiates substantially omnidirectionally.
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Accused Products
Abstract
An ultrasonic communication system includes an omnidirectional ultrasonic transducer including a housing having a closed side and an open side defining an aperture in the housing. A diaphragm is mounted into the housing to form a sealed cavity between the diaphragm and the closed side of the housing. A second side of the diaphragm is free to transmit ultrasonic signals through the aperture. The diaphragm and aperture both have a largest dimension that is less than or equal to one-quarter wavelength of an ultrasonic signal to be transmitted by the transducer, such that the transducer behaves as a monopole and radiates substantially omnidirectionally.
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Citations
20 Claims
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1. An ultrasonic communication system including an omnidirectional transducer, the transducer comprising:
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a housing having a closed side and an open side defining an aperture in the housing; and
a diaphragm mounted into the housing to form a sealed cavity between a first side of the diaphragm and the closed side of the housing, a second side of the diaphragm being free to transmit ultrasonic signals through the aperture;
the diaphragm and aperture both have a largest dimension that is less than or equal to one-quarter wavelength of an ultrasonic signal to be transmitted by the transducer, such that the transducer behaves as a monopole and radiates substantially omnidirectionally. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An ultrasonic communication system, comprising:
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a modulator that modulates an incoming signal and provides an ultrasonic modulated signal;
an ultrasonic transmitter coupled to the modulator, the ultrasonic transmitter including a transducer configured to transmit the modulated signal in an omnidirectional pattern, the transducer comprising a piezoceramic plate mounted into a housing to form a sealed cavity between a first side of the piezoceramic plate and the housing, a second side of the piezoceramic plate being free to transmit ultrasonic signals through an aperture in the housing, the aperture and plate being of similar dimensions;
an ultrasonic receiver including a microphone configured to pick up the modulated signal; and
a demodulator coupled to the ultrasonic receiver, the demodulator converts the modulated signal from the receiver into an outgoing signal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. An ultrasonic communication system with a radiotelephone and remote earpiece linked ultrasonically, comprising:
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a modulator coupled to the radiotelephone, the modulator modulates an audio signal from the radiotelephone and provides an ultrasonic modulated signal;
an ultrasonic transmitter coupled to the modulator, the ultrasonic transmitter including a transducer configured to transmit the modulated signal in an omnidirectional pattern, the transducer comprising a piezoceramic plate mounted into a housing to form a sealed cavity between a first side of the piezoceramic plate and the housing, a second side of the piezoceramic plate being free to transmit ultrasonic signals through an aperture in the housing, the aperture and plate being of similar dimensions that is less than or equal to one-quarter wavelength of the modulated signal such that the transducer behaves as a monopole and radiates substantially omnidirectionally;
an ultrasonic receiver disposed within the remote earpiece, the receiver including an omnidirectional ultrasonic microphone configured to pick up the ultrasonically modulated signal; and
a demodulator coupled to the ultrasonic receiver, the demodulator converts the received modulated signal from the receiver into an audio signal coupled to a speaker. - View Dependent Claims (17, 18, 19, 20)
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Specification