Harmonic sine wave data transmission system

Claim 2

A signal transmission system comprising a signal source, a transmission path, modulating means responsive to digital signals successively applied from said signal source for generating sequential combinations of fundamental and third harmonic sine waves in signal bit periods extending between immediately successive pairs of zero crossings of the fundamental sine wave, and means for applying said sequential fundamental and third harmonic sine wave combinations to said transmission path, said modulating means comprising means for generating a fundamental sine wave signal and a third harmonic sine wave signal, means for synchronizing fundamental and third harmonic sine wave signals to have identical phases at each zero crossing of said fundamental sine wave, means connected between said generating means and said transmission path applying means responsive to said successively applied digital signals for selectively gating one of said generated sine waves to said transmission path applying means in each bit period, demodulating means connected to said transmission path for converting sequential fundamental and third harmonic sine wave combinations received from said transmission path to digital signals having the same form as the digital signals from said signal source, said demodulating means comprising second means for generating a fundamental sine wave and a third harmonic sine wave in signal bit periods extending between immediately successive pairs of zero crossings of said fundamental sine wave, second means for synchronizing said sine waves to have identical phases at each of said zero crossings, means for generating sampling signals at the midpoints of said signal bit periods comprising means for algebraically combining said generated fundamental and third harmonic sine waves, and means jointly responsive to sine waves signals received from said transmission path and said sampling signals for detecting the polarity of said sine wave signals from said transmission path at said signal period midpoints.

Claim 3

A signal transmission system according to claim 1 wherein said modulator and demodulator sine wave generating means are operative to produce the same frequency fundamental and third harmonic sine waves, and said demodulating means further comprises means for deriving a fundamental frequency sine wave signal from said received signals in each signal bit period, and for applying said derived fundamental sine wave signal to said demodulator generating means to synchronize said demodulator generating means to said received signals.

Claim 4

In a data transmission system for exchanging digital information between devices in the form of sequential combinations of fundamental and third harmonic sine wave signals having bit periods extending between immediately successive pairs of the zero crossings of said fundamental sine wave via a transmission path, a repeater circuit comprising means for receiving sequential combinations of said fundamental and third harmonic sine waves from said transmission path, each of said bit periods containing one of said sine wave signals to form said sequential combinations, means for converting each sine wave received in a bit period into a corresponding digital signal having the same bit period, means for generating fundamental and third harmonic sine waves having identical phases at each of the fundamental sine wave zero crossings, means responsive to each digital signal from said converting means for gating one of said generated fundamental and third harmonic sine waves to said transmission path in each bit period whereby a sequeNtial combination of fundamental and third harmonic sine waves corresponding to said received sine wave combination is applied to said transmission path.

Claim 5

In a data transmission system for exchanging digital information between devices in the form of sequential combinations of fundamental and third harmonic sine wave signals having bit periods extending between immediately successive pairs of the zero crossings of said fundamental sine wave via a transmission path, a repeater circuit comprising means for receiving sequential combinations of said fundamental and third harmonic sine waves from said transmission path, each of said bit periods containing one of said sine wave signals to form said sequential combinations, means for converting each sine wave received in a bit period into a corresponding digital signal having the same bit period, means for generating fundamental and third harmonic sine waves having identical phases at each of the fundamental sine wave zero crossings, means responsive to each digital signal from said converting means for gating one of said generated fundamental and third harmonic sine waves to said transmission path in each bit period whereby a sequeNtial combination of fundamental and third harmonic sine waves corresponding to said received sine wave combination is applied to said transmission path.

Claim 6

In a data transmission system for exchanging digital information between devices in the form of sequential combinations of fundamental and third harmonic sine wave signals via a transmission path, a repeater circuit according to claim 3 wherein said converting means comprises means for combining said generated sine waves to form sampling pulses at each bit period midpoint and means jointly responsive to said received sine waves and said sampling pulses for determining the polarity of said received signals at said midpoints, and further comprising means connected between said converting means and said gating means for storing said digital signals.

Claim 7

A data transmission system for exchanging digital information between a pair of devices in the form of sequential combinations of fundamental and third harmonic sine wave signals having a signal bit period extending between immediately successive zero crossings of said fundamental frequency sine wave comprising a transmission path and a transmission circuit associated with each device, and means for coupling digital signals having bit periods extending between immediately successive zero crossings of said fundamental sine wave signal between one of said pair of devices and the associated transmission circuit, said transmission circuit comprising modulating means connected between said coupling means and said transmission path for converting said digital signals into said sequential combinations of fundamental and third harmonic sine wave signals and for applying said fundamental and third harmonic sine wave signals to said transmission path, each of said bit periods containing one of said sine wave signals to form said sequential combinations, said modulating means comprising first means for generating a fundamental and a third harmonic sine wave having identical phases at the zero crossings of said fundamental sine wave, and means connected between said first generating means and said transmission path responsive to said digital signals from said coupling means for selectively gating one of said generated sine waves to said transmission path in each signal bit period, and demodulating means connected between said transmission path and said coupling means for converting fundamental and third harmonic sine wave signals of said signal bit period received from said transmission path into digital signals of said bit period and for applying the digital signals corresponding to said received sine wave signals to said coupling means, said demodulating means comprising second means for generating a fundamental sine wave and a third harmonic sine wave having identical phases at the zero crossings of said fundamental sine wave, means for forming sampling signals at said signal bit period midpoints comprising means for linearly combining said generated sine waves from said second generating means, means jointly responsive to said sampling signals and said received sine waves for detecting the polarity of said received signals at said signal bit period midpoints, and means for producing one of first and second types of digital signals corresponding to the detected polarity of each received signal.

Claim 8

A data transmission system for exchanging digital information between a pair of devices in the form of sequential combinations of fundamental and third harmonic sine wave signals having a signal bit period extending between immediately successive zero crossings of said fundamental frequency sine wave comprising a transmission path and a transmission circuit associated with each device, and means for coupling digital signals having bit periods extending between immediately successive zero crossings of said fundamental sine wave signal between one of said pair of devices and the associated transmission circuit, said transmission circuit comprising modulating means connected between said coupling means and said transmission path for converting said digital signals into said sequential combinations of fundamental and third harmonic sine wave signals and for applying said fundamental and third harmonic sine wave signals to said transmission path, each of said bit periods containing one of said sine wave signals to form said sequential combinations, said modulating means comprising first means for generating a fundamental and a third harmonic sine wave having identical phases at the zero crossings of said fundamental sine wave, and means connected between said first generating means and said transmission path responsive to said digital signals from said coupling means for selectively gating one of said generated sine waves to said transmission path in each signal bit period, and demodulating means connected between said transmission path and said coupling means for converting fundamental and third harmonic sine wave signals of said signal bit period received from said transmission path into digital signals of said bit period and for applying the digital signals corresponding to said received sine wave signals to said coupling means, said demodulating means comprising second means for generating a fundamental sine wave and a third harmonic sine wave having identical phases at the zero crossings of said fundamental sine wave, means for forming sampling signals at said signal bit period midpoints comprising means for linearly combining said generated sine waves from said second generating means, means jointly responsive to said sampling signals and said received sine waves for detecting the polarity of said received signals at said signal bit period midpoints, and means for producing one of first and second types of digital signals corresponding to the detected polarity of each received signal.

Claim 9

A data transmission system according to claim 5 wherein said coupling means comprises means for storing the digital signals from said associated device and said demodulating means.

Claim 10

A data transmission system according to claim 6 wherein said first generating means comprises means for synchronizing said fundamental and third harmonic sine wave generating means at each of the fundamental sine wave zero crossing, said digital signals comprise two alternative signal types, and said gating means comprises means responsive to one signal type for applying a half cycle of said fundamental sine wave to said transmission path, and means responsive to the other signal type For applying three consecutive half cycles of said third harmonic sine wave to said transmission path whereby a smooth transition always occurs between the sine wave signals of consecutive signal periods.

Claim 11

A data transmission system according to claim 7 wherein said synchronizing means comprises means responsive to said fundamental sine wave signals for momentarily interrupting said fundamental and third harmonic generating means at each fundamental sine wave zero crossing to maintain identical phases between said fundamental and third harmonic generating means at said zero crossings.

Claim 12

A data transmission system according to claim 8 wherein said second generating means comprises a fundamental sine wave oscillator and a third harmonic sine wave oscillator, and means responsive to said fundamental sine wave oscillator signals for synchronizing the frequency and phase of said demodulating means sine wave oscillators at each the zero crossings of fundamental sine wave.

Claim 13

A data transmission system according to claim 9 wherein said demodulating means further comprises means responsive to said received signals for deriving a fundamental sine wave signal from said received signal in each signal bit period, and means for coupling said derived signal to said fundamental sine wave oscillator whereby said fundamental and third harmonic oscillators are synchronized to said received signal.

Claim 14

A data transmission system according to claim 10 wherein said deriving means comprises means for blocking the center half cycle of each received third harmonic sine wave signal.

Claim 15

A data transmission loop for simultaneously exchanging data information between two devices in the form of sequential combinations of fundamental and third harmonic sine wave signals having signal bit periods extending between immediately successive zero crossings of said fundamental frequency comprising a pair of transmission lines and a data link circuit having data storage means, said data link circuit further comprising a data transmitter connected between said storage means and one of said transmission lines for converting data signals having bit periods extending between immediately successive zero crossings of said fundamental sine wave from said storage means to sequential combinations of fundamental and third harmonic sine wave signals having one of said sine wave signals in each of said bit periods and identical phases at each zero crossing of said fundamental sine wave, said data transmitter comprising first means for generating a fundamental and a third harmonic sine wave having identical phases at the zero crossings of said fundamental sine wave, and means connected between said first generating means and the one of said pair of transmission lines responsive to said data signals for selectively gating one of said generated sine waves to the one of said pair of transmission lines in each signal bit period, and a data receiver connected between the other of said transmission lines and said storage means for converting the sequential sine wave combinations received from said other transmission line having said bit periods into data signals having said bit periods and for applying said data signals to said storage means, said data receiver comprising second means for generating a fundamental and a third harmonic sine wave having identical phases at the zero crossings of said fundamental sine wave, means for combining saId fundamental and third harmonic sine wave from said second generating means to form sampling signals at the midpoints of said signal bit periods and means jointly responsive to the sampling signals and the received sine wave combinations for detecting the polarity of said received sine wave combinations at said signal bit period midpoints.

Claim 16

A data transmission loop for simultaneously exchanging data information between two devices in the form of sequential combinations of fundamental and third harmonic sine wave signals having signal bit periods extending between immediately successive zero crossings of said fundamental frequency comprising a pair of transmission lines and a data link circuit having data storage means, said data link circuit further comprising a data transmitter connected between said storage means and one of said transmission lines for converting data signals having bit periods extending between immediately successive zero crossings of said fundamental sine wave from said storage means to sequential combinations of fundamental and third harmonic sine wave signals having one of said sine wave signals in each of said bit periods and identical phases at each zero crossing of said fundamental sine wave, said data transmitter comprising first means for generating a fundamental and a third harmonic sine wave having identical phases at the zero crossings of said fundamental sine wave, and means connected between said first generating means and the one of said pair of transmission lines responsive to said data signals for selectively gating one of said generated sine waves to the one of said pair of transmission lines in each signal bit period, and a data receiver connected between the other of said transmission lines and said storage means for converting the sequential sine wave combinations received from said other transmission line having said bit periods into data signals having said bit periods and for applying said data signals to said storage means, said data receiver comprising second means for generating a fundamental and a third harmonic sine wave having identical phases at the zero crossings of said fundamental sine wave, means for combining saId fundamental and third harmonic sine wave from said second generating means to form sampling signals at the midpoints of said signal bit periods and means jointly responsive to the sampling signals and the received sine wave combinations for detecting the polarity of said received sine wave combinations at said signal bit period midpoints.

Claim 17

A data transmission loop according to claim 12 further comprising a second data link circuit including data transceiver comprising means for converting the sequential sine wave combinations received fRom said one transmission line having said bit periods into first data signals, means for applying saId first data signals to a store in said second data link circuit, means for coupling second data signals from a device associated with said second data link circuit to said store, means for converting said stored second data signals into fundamental and third harmonic sequential sine wave signal combinations, each sine wave signal corresponding to a second data signal having a bit period extending between immediately successive zero crossings of said fundamental sine wave, and means for applying the sequential sine wave combinations corresponding to said second data signals to said other transmission line.

Claim 18

A data transmission loop according to claim 13 wherein said data transmitter, said data receiver, and saId data transceiver each includes an associated pair of fundamental and third harmonic sine wave oscillators and means for synchronizing each oscillator pair at the zero crossings of said fundamental sine wave.

Claim 19

A data transmission loop according to claim 14 wherein said means for converting said data signals into said sine wave combinations comprises means responsive to said data signals for selectively gating the outputs of said sine wave oscillators in said bit periods.

Claim 20

A data transmission loop according to claim 15 wherein said data receiver and said data transceiver each further comprises means for deriving a fundamental sine wave from said successively received sine wave combinations in each signal period and means for applying said derived sine wave to the associated oscillator pair to synchronize said associated oscillator pair to the data transmitter oscillator pair whereby the operation of said data receiver and said data transceiver is synchronized to the operation of said data transmitter.