Traffic preemption system communication method
First Claim
1. A remotely-controlled traffic-preemption system, comprising:
- an encoder circuit adapted to generate a set of signal pulses, wherein at least one bit of a data word is encoded as a function of amplitude modulation of a first subset ot the set of signal pulses and at least another bit of the data word is encoded as a function of frequency modulation of a second subset of the set of signal pulses;
an optical source adapted to transmit a set of light pulses having a respective light pulse for each signal pulse of the set of signal pulses;
an optical detector adapted to receive the set of light pulses; and
a decoder circuit adapted to generate the data word from the set or light pulses received at the optical detector.
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Abstract
A remotely-controlled traffic-preemption system and method includes an encoder circuit, an optical source, an optical detector, and a decoder circuit. The encoder circuit is adapted to generate a set of signal pulses. At least one bit of a data word is encoded as a function of amplitude modulation of a first subset of the set of signal pulses and at least another bit of the data word is encoded as a function of frequency modulation of a second subset of the set of signal pulses. The optical source is adapted to transmit a set of light pulses having a respective light pulse for each signal pulse of the set of signal pulses. The optical detector is adapted to receive the set of light pulses. The decoder circuit is adapted to generate the data word from the set of light pulses received at the optical detector.
60 Citations
20 Claims
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1. A remotely-controlled traffic-preemption system, comprising:
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an encoder circuit adapted to generate a set of signal pulses, wherein at least one bit of a data word is encoded as a function of amplitude modulation of a first subset ot the set of signal pulses and at least another bit of the data word is encoded as a function of frequency modulation of a second subset of the set of signal pulses; an optical source adapted to transmit a set of light pulses having a respective light pulse for each signal pulse of the set of signal pulses; an optical detector adapted to receive the set of light pulses; and a decoder circuit adapted to generate the data word from the set or light pulses received at the optical detector. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A communication method for use in a remotely-control traffic-preemption system, the method comprising:
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encoding at least one bit of a data word as a function of amplitude modulation of a first subset of a set of optical pulses; and encoding at least another bit of the data word as a function of frequency modulation of a second subset of the set of optical pulses; transferring the set of optical pulses to an optical detector; and decoding the data word from the optical pulses received at the optical detector. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An optical emitter for a remotely-controlled traffic-preemption system, the optical emitter comprising:
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an encoder circuit adapted to generate a set of signal pulses, wherein at least one bit of a data word is encoded as a function of amplitude modulation of a first subset of the set of signal pulses and at least another bit of the data word is encoded as a function of frequency modulation of a second subset of the set of signal pulses; and an optical source adapted to transmit a set of light pulses having a respective light pulse for each signal pulse of the set of signal pulses. - View Dependent Claims (14, 15, 16, 17)
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18. A phase selector for a remotely-controlled traffic-preemption system, the phase selector comprising:
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an optical detector adapted to receive the set of light pulses, wherein at least one bit of a data word is encoded as a function of amplitude modulation of a first subset of the set of light pulses and at least another bit of the data word is encoded as a function of frequency modulation of a second subset of the set of light pulses; and a decoder circuit adapted to generate the data word from the set of light pulses received at the optical detector. - View Dependent Claims (19, 20)
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Specification