RFID reader with digital waveform encoding and digital decoding
First Claim
Patent Images
1. A Radio Frequency Identification (RFID) reader, comprising:
- a first microprocessor acting as a controller;
a second microprocessor in communication with the first microprocessor, the second microprocessor generating a digitally synthesized waveform;
a converter for converting the digitally synthesized waveform to an analog waveform; and
a modulator for combining the analog waveform with a carrier signal for generating an outgoing signal.
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Abstract
A Radio Frequency Identification (RFID) reader according to one embodiment of the present invention includes a first microprocessor acting as a controller, and a second microprocessor, e.g., DSP, in communication with the first microprocessor, the second microprocessor generating a digitally synthesized waveform. A converter converts the digitally synthesized waveform to an analog waveform. A modulator combines the analog waveform with a carrier signal for generating an outgoing signal. The waveform may have rising and falling edges of varying shape. Methods are also presented.
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Citations
35 Claims
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1. A Radio Frequency Identification (RFID) reader, comprising:
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a first microprocessor acting as a controller;
a second microprocessor in communication with the first microprocessor, the second microprocessor generating a digitally synthesized waveform;
a converter for converting the digitally synthesized waveform to an analog waveform; and
a modulator for combining the analog waveform with a carrier signal for generating an outgoing signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A Radio Frequency Identification (RFID) reader, comprising:
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a microprocessor for generating a digitally synthesized waveform having rising and falling edges having some shape other than completely vertical between high and low values thereof;
a converter for converting the digitally synthesized waveform to an analog waveform; and
a modulator for combining the analog waveform with a carrier signal for generating an outgoing signal. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. A method for generating a radio frequency signal, comprising:
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generating parameters of data content for a packet in a first microprocessor;
sending the parameters to a second microprocessor;
generating a waveform corresponding to the parameters in the second microprocessor; and
combining the waveform with a second waveform.
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31. A method, comprising:
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generating parameters of data content for a packet in a first microprocessor;
sending the parameters to a second microprocessor;
generating a waveform corresponding to the parameters in the second microprocessor; and
combining the waveform with a second waveform for generating an analog output waveform, wherein the analog output waveform is comprised of more than two voltage levels each of which is controlled by separate data values. - View Dependent Claims (32, 33)
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34. A Radio Frequency Identification (RFID) reader, comprising:
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a first microprocessor acting as a controller; and
a second microprocessor in communication with the first microprocessor, the second microprocessor converting an incoming analog signal to a digital packet, wherein the first microprocessor determines whether the digital packet is valid.
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35. A Radio Frequency Identification (RFID) reader, comprising:
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a first microprocessor acting as a controller;
a second microprocessor in communication with the first microprocessor, the second microprocessor generating a digitally synthesized waveform, the second microprocessor converting an incoming analog signal to a digital packet;
a converter for converting the digitally synthesized waveform to an analog waveform; and
a modulator for combining the analog waveform with a carrier signal for generating an outgoing signal.
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Specification