Power line signalling system
First Claim
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1. Apparatus for transmitting data from a transmitter to a receiver via an alternating current electrical signal supplied by the transmitter from an alternating current signal source to the receiver comprising:
- first transmitter means for suppressing a first pulse of the alternating current signal having a first polarity;
second transmitter means for suppressing a second pulse of the alternating current signal having opposite second polarity a predetermined time interval after suppression of the first pulse, the time interval between the suppressed pulses indicating the data to be transmitted;
first receiver means for detecting the absence of a first pulse of the first polarity in the received alternating current signal; and
second receiver means responsive to the first receiver means for detecting the absence of a pulse of the second polarity in the received alternating current signal after detection of the absence of the first pulse and for producing an output indication of the time interval between the absence of the first pulse and the absence of the second pulse.
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Abstract
A system for transmitting data from a transmitter to a receiver via an alternating current power line connecting the transmitter and receiver. The transmitter suppresses half cycles of the power signal, the suppressed half cycles being of alternating polarity. The data to be transmitted is represented by the time interval or number of power signal cycles between the suppressed half cycles.
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Citations
14 Claims
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1. Apparatus for transmitting data from a transmitter to a receiver via an alternating current electrical signal supplied by the transmitter from an alternating current signal source to the receiver comprising:
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first transmitter means for suppressing a first pulse of the alternating current signal having a first polarity; second transmitter means for suppressing a second pulse of the alternating current signal having opposite second polarity a predetermined time interval after suppression of the first pulse, the time interval between the suppressed pulses indicating the data to be transmitted; first receiver means for detecting the absence of a first pulse of the first polarity in the received alternating current signal; and second receiver means responsive to the first receiver means for detecting the absence of a pulse of the second polarity in the received alternating current signal after detection of the absence of the first pulse and for producing an output indication of the time interval between the absence of the first pulse and the absence of the second pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus for transmitting data signals from a transmitter to a receiver via an alternating current power supply line connecting the transmitter and receiver comprising:
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first transmitter means for suppressing half cycles of the alternating current power signal at predetermined regular intervals, the half cycles suppressed by the first transmitter means having first polarity; second transmitter means for suppressing an alternating current power signal half cycle of opposite second polarity a selective number of alternating current power signal cycles after each suppressed half cycle of first polarity, the number of cycles of the alternating current power signal between each suppressed half cycle of first polarity and the subsequent suppressed half cycle of second polarity representing the data to be transmitted; first receiver means responsive to the alternating current power signal produced by the transmitter for detecting suppressed power signal half cycles of the first polarity; second receiver means responsive to the alternating current power signal produced by the transmitter for detecting suppressed power signal half cycles of the second polarity and for producing an output signal indicative of the number of power signal cycles between the suppressed half cycle of second polarity and the preceding suppressed half cycle of first polarity. - View Dependent Claims (11, 12, 13, 14)
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Specification