Identification apparatus and methods
First Claim
1. In a system for multiple device identification and communication of data having an interrogating station for interrogating a plurality of transponders wherein the interrogating station is capable of receiving communications from said transponders via carrier frequencies, each said transponder comprising:
- transmitter means adapted, when the transponder is interrogated by the interrogating station, to transmit an information signal via a carrier signal having a frequency selected from a set of possible carrier signal frequencies; and
frequency generating means for selectively generating the set of possible carrier signal frequencies;
the information signal being transmitted successively or repetitively using at each transmission a newly selected carrier signal frequency or set of newly selected carrier signal frequencies;
wherein the frequency of the newly selected carrier signal frequency or set of newly selected carrier signal frequencies is selected independent of external influence and independent of external knowledge by the interrogating station.
3 Assignments
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Accused Products
Abstract
An identification system comprising a transponder having receiver means adapted to extract powering energy from a surrounding electromagnet field, transponder transmitter means adapted to transmit at least one unique signal from the transponder, frequency generating means for generating a plurality of pre-determined frequencies, each frequency adapted to carry the signal from the transmitter means to an interrogator receiver means adapted to receive said signals to achieve identification of said transponder, said transponder transmitting signals successively or repetitively using at each successive or repetitive transmission a newly selected frequency or set of newly selected frequencies.
151 Citations
39 Claims
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1. In a system for multiple device identification and communication of data having an interrogating station for interrogating a plurality of transponders wherein the interrogating station is capable of receiving communications from said transponders via carrier frequencies, each said transponder comprising:
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transmitter means adapted, when the transponder is interrogated by the interrogating station, to transmit an information signal via a carrier signal having a frequency selected from a set of possible carrier signal frequencies; and frequency generating means for selectively generating the set of possible carrier signal frequencies; the information signal being transmitted successively or repetitively using at each transmission a newly selected carrier signal frequency or set of newly selected carrier signal frequencies; wherein the frequency of the newly selected carrier signal frequency or set of newly selected carrier signal frequencies is selected independent of external influence and independent of external knowledge by the interrogating station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 39)
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13. In a system for multiple device identification and communication of data having an interrogating station for interrogating a plurality of transponders wherein the interrogating station is capable of receiving communications from said transponders via carrier frequencies, each said transponder comprising:
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logic means adapted to provide an information signal for transmission by said transponder; transmitter means adapted to transmit the informational signal; frequency generating means adapted to provide a set of possible carrier signal frequencies greater than two in number, at least one of the carrier signal frequencies being available for transmission of the information signal at each transmission of the information signal; and carrier signal selection means adapted to select at least on of the carrier signal frequencies from the set of possible carrier signal frequencies at each transmission of the information signal, the frequency selected for each transmission of the information signal being determined internal of the transponder independent of external knowledge and external influence by the interrogating station. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A system of device identification comprising;
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at least two identifiable devices and a device identifier adapted to communicate with said devices by interrogating the devices and receiving data signals from said devices, said identifier adapted to receive signals simultaneously from a plurality of said devices, wherein, each identifiable device includes transmitter means adapted to transmit a data signal to the identifier, each transmitter means being adapted to transmit said data signal via a respective carrier signal, the frequency of the carrier signal being selected by each respective device from a predetermined set of carrier signal frequencies greater than two in number, the frequency of each carrier signal being determined internal of each respective device independent of external knowledge and external influence by the identifier. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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33. A method of communication between an interrogator and at least one remote device, said method comprising the steps of:
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the interrogator interrogating one or more of said remote devices, each remote device generating a first signal for transmission via a carrier signal at a frequency selected by each respective remote device from a respective predetermined set of carrier signal frequencies, the frequency of the carrier signal being determined by each remote device, transmitting said first signal from each remote device to the interrogator, and generating and transmitting the first signal successively or repetitively at each transmission via a new carrier signal, the frequency of the new carrier signal being newly selected internal of each remote device and independent of external knowledge and influence by the interrogator. - View Dependent Claims (34, 35, 36)
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37. In a system for communication between an interrogating station for interrogating a plurality of transponders wherein the interrogating station includes a receiver that is capable of receiving communication from the transponders via carrier frequencies, wherein each said transponder is adapted for asynchronous communication with the external receiver, said transponder including:
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transmitter means adapted to transmit asynchronously at least one signal from the transponder to the external receiver, frequency generating means adapted to provide a predetermined set of possible carrier frequencies, the transmitter means being adapted to transmit the at least one signal at a frequency selected from the predetermined set of possible carrier frequencies independent of external knowledge and external influence by said interrogating station. - View Dependent Claims (38)
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Specification