Single and multiple sinewave modulation and demodulation techniques employing carrier-zero and carrier-peak data-word start and stop
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Abstract
A method for detecting encoded digital data from a substantially sinusoidal waveform, the encoded digital data having one of a first value and a second value at selected phase angles θn comprises generating the waveform having an amplitude Y defined by a first function at phase angles lying outside of regions having a range Δθ beginning at each phase angle θn, said first function being Y=sin θ; generating the waveform having an amplitude Y defined by the first function at phase angles lying inside the regions having a range of Δθ beginning at each phase angle θn where data of the first value is to be encoded; and generating the waveform having an amplitude Y defined by a second function at phase angles lying inside the regions having a range of Δθ associated with each phase angle θn where data of the second value is to be encoded, the second function being different from Y=sin θ, the detection including deriving sync pulses from minima and maxima of the substantially sinusoidal waveform to frame data words.
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Citations
128 Claims
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1-80. -80. (canceled)
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81. A method for decoding information from a substantially sinusoidal waveform containing encoded digital data at selected phase angles θ
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n, the waveform having an amplitude Y=sin θ
at phase angles lying outside of data regions, the waveform having an amplitude Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the first value is to be encoded, the waveform having an amplitude Y defined by a function different from Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the second value is to be encoded, comprising;
receiving the sinusoidal waveform containing encoded digital data;
generating a reference sinusoidal waveform from said substantially sinusoidal waveform containing encoded digital data, said reference sinusoidal waveform having a constant phase relationship with said sinusoidal waveform containing encoded digital data;
mixing said reference sinusoidal waveform and said substantially sinusoidal waveform containing encoded digital data in a balanced mixer;
extracting said encoded digital data from said balanced mixer;
detecting zero-crossings of one of said sinusoidal waveform and said reference sinusoidal waveform; and
generating a sync signal from the detected zero crossings. - View Dependent Claims (82, 83, 84, 85, 86)
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n, the waveform having an amplitude Y=sin θ
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87. A method for decoding information from a substantially sinusoidal waveform containing encoded digital data at selected phase angles θ
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n, the waveform having an amplitude Y=sin θ
at phase angles lying outside of data regions, the waveform having an amplitude Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the first value is to be encoded, the waveform having an amplitude Y defined by a function different from Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the second value is to be encoded, comprising;
receiving the sinusoidal waveform containing encoded digital data;
generating a reference sinusoidal waveform from said substantially sinusoidal waveform containing encoded digital data, said reference sinusoidal waveform having a constant phase relationship with said sinusoidal waveform containing encoded digital data;
mixing said reference sinusoidal waveform and said substantially sinusoidal waveform containing encoded digital data in a balanced mixer;
extracting said encoded digital data from said balanced mixer;
detecting peaks of one of said sinusoidal waveform and said reference sinusoidal waveform; and
generating a sync signal from the detected peaks. - View Dependent Claims (88, 89, 90, 91, 92)
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n, the waveform having an amplitude Y=sin θ
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93. A method for decoding information from a substantially sinusoidal waveform containing encoded digital data at selected phase angles θ
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n, the waveform having an amplitude Y=sin θ
at phase angles lying outside of data regions, the waveform having an amplitude Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the first value is to be encoded, the waveform having an amplitude Y defined by a function different from Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the second value is to be encoded, comprising;
receiving the sinusoidal waveform containing encoded digital data;
digitizing said sinusoidal waveform containing encoded digital data;
generating a digital reference sinusoidal waveform having a constant phase relationship with said sinusoidal waveform containing encoded digital data; and
performing inverse fast fourier transform digital signal processing on said reference sinusoidal waveform and said substantially sinusoidal waveform containing encoded digital data;
detecting zero-crossings of one of said sinusoidal waveform and said reference sinusoidal waveform; and
generating a sync signal from the detected zero crossings. - View Dependent Claims (94, 95, 96, 97, 98)
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n, the waveform having an amplitude Y=sin θ
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99. A method for decoding information from a substantially sinusoidal waveform containing encoded digital data at selected phase angles θ
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n, the waveform having an amplitude Y=sin θ
at phase angles lying outside of data regions, the waveform having an amplitude Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the first value is to be encoded, the waveform having an amplitude Y defined by a function different from Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the second value is to be encoded, comprising;
receiving the sinusoidal waveform containing encoded digital data;
digitizing said sinusoidal waveform containing encoded digital data;
generating a digital reference sinusoidal waveform having a constant phase relationship with said sinusoidal waveform containing encoded digital data; and
performing inverse fast fourier transform digital signal processing on said reference sinusoidal waveform and said substantially sinusoidal waveform containing encoded digital data;
detecting peaks of one of said sinusoidal waveform and said reference sinusoidal waveform; and
generating a sync signal from the detected peaks. - View Dependent Claims (100, 101, 102, 103, 104)
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n, the waveform having an amplitude Y=sin θ
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105. A communications system for communicating in a communications medium and comprising:
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a first station including;
an encoder for generating at least one substantially sinusoidal waveform containing encoded digital data at selected phase angles θ
n, the waveform having an amplitude Y=sin θ
at phase angles lying outside of data regions, the waveform having an amplitude Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the first value is to be encoded, the waveform having an amplitude Y defined by a function different from Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the second value is to be encoded; and
a transmitter for transmitting said at least one substantially sinusoidal waveform containing encoded digital data through said medium;
a second station coupled to said first station through said communications medium and including;
a receiver for receiving said at least one substantially sinusoidal waveform containing encoded digital data through said medium from said first station, said receiver including a circuit for detecting zero crossings of one of said sinusoidal waveform and said reference sinusoidal waveform and for generating a sync signal from the detected zero crossings; and
a decoder for extracting said digital data from said at least one substantially sinusoidal waveform containing encoded digital data using said sync signal for framing said digital data. - View Dependent Claims (106, 107, 108, 109, 110)
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111. A communications system for communicating in a communications medium and comprising:
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a first station including;
an encoder for generating at least one substantially sinusoidal waveform containing encoded digital data at selected phase angles θ
n, the waveform having an amplitude Y=sin θ
at phase angles lying outside of data regions, the waveform having an amplitude Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the first value is to be encoded, the waveform having an amplitude Y defined by a function different from Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the second value is to be encoded; and
a transmitter for transmitting said at least one substantially sinusoidal waveform containing encoded digital data through said medium;
a second station coupled to said first station through said communications medium and including;
a receiver for receiving said at least one substantially sinusoidal waveform containing encoded digital data through said medium from said first station, said receiver including a circuit for detecting peaks of one of said sinusoidal waveform and said reference sinusoidal waveform and for generating a sync signal from the detected peaks; and
a decoder for extracting said digital data from said at least one substantially sinusoidal waveform containing encoded digital data using said sync signal for framing said digital data. - View Dependent Claims (112, 113, 114, 115, 116)
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117. A communications system for communicating in a communications medium and comprising:
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a first station;
a second station coupled to said first station through said communications medium;
wherein said first and second stations each include;
an encoder for generating at least one substantially sinusoidal waveform containing encoded digital data at selected phase angles θ
n, the waveform having an amplitude Y=sin θ
at phase angles lying outside of data regions, the waveform having an amplitude Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the first value is to be encoded, the waveform having an amplitude Y defined by a function different from Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the second value is to be encoded;
a transmitter for transmitting said at least one substantially sinusoidal waveform containing encoded digital data through said medium;
a receiver for receiving said at least one substantially sinusoidal waveform containing encoded digital data through said medium from said first station, said receiver including a circuit for detecting zero crossings of one of said sinusoidal waveform and said reference sinusoidal waveform and for generating a sync signal from the detected zero crossings; and
a decoder for extracting said digital data from said at least one substantially sinusoidal waveform containing encoded digital data using said sync signal for framing said digital data. - View Dependent Claims (118, 119, 120, 121, 122)
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123. A communications system for communicating in a communications medium and comprising:
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a first station;
a second station coupled to said first station through said communications medium;
wherein said first and second stations each include;
an encoder for generating at least one substantially sinusoidal waveform containing encoded digital data at selected phase angles θ
n, the waveform having an amplitude Y=sin θ
at phase angles lying outside of data regions, the waveform having an amplitude Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the first value is to be encoded, the waveform having an amplitude Y defined by a function different from Y=sin θ
at phase angles lying inside the data regions having a range of Δ
θ
beginning at each phase angle θ
n where data of the second value is to be encoded;
a transmitter for transmitting said at least one substantially sinusoidal waveform containing encoded digital data through said medium;
a receiver for receiving said at least one substantially sinusoidal waveform containing encoded digital data through said medium from said first station, said receiver including a circuit for detecting peaks of one of said sinusoidal waveform and said reference sinusoidal waveform and for generating a sync signal from the detected peaks; and
a decoder for extracting said digital data from said at least one substantially sinusoidal waveform containing encoded digital data using said sync signal for framing said digital data. - View Dependent Claims (124, 125, 126, 127, 128)
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Specification