US3835386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Binary data communication apparatus
Assignee: UK Secretary of State for Defence
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Filing: 1973-05-30
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Granted: 1974-09-10
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Expires: 1993-05-30
Abstract
Abstract Apparatus for the single side band transmission of binary data. The apparatus comprises a coder which converts the binary data sequence to a related code sequence, gate circuit means, a carrier signal generator and a band pass filter. The related code sequence and carrier signals are applied to the gate circuit means so that the related code sequence gates the carrier signals through to the output. The output of the gate circuit means therefor comprises bursts of carrier signals. The gate circuit means are further arranged so that alternate bursts of carrier signal are in anti-phase relationship with each other. These carrier signal bursts are applied to a band pass filter. The response of the filter is such that when a half bit duration burst is applied to it the output is a burst of oscillation of twice the bit duration rising from zero amplitude to a maximum in the first bit period and falling again to zero in the second bit period. The filter''s output is an amplitude and dipolar angle modulated (ADAM) signal which only occupies a single side band and can be detected at the receiver by a simple envelope detector.
Inventors
- 👤 F Court
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:03
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/233; H04L27/2334; H04L27/02; H04L27/20; H04L27/2032; H04L27/2035
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
203 words
Telecommunications apparatus for single side-band transmission of a binary data sequence which includes signals of a first kind and signals of a second kind, each signal being of a predetermined bit duration, comprising coder means for converting the binary data sequence to a related. code sequence, a carrier signal generator, gate circuit means connected to receive the said related code sequence from the coder means and to receive carrier wavesignals from the said carrier-wave signal generator, and arranged to opeRate on receipt of each signal representing the signals of the said second kind in the binary data sequence such that a burst of the carrier-wave signal is produced at the output of the gate circuit means and such that successive bursts of the carrier signals are in antiphase; a bandpass filter connected to the output of the gate circuit means and having frequency and amplitude response characteristics such that a half bit duration burst of carrier-wave signal applied at its input produces an output signal of twice the bit duration which rises from zero amplitude to a maximum amplitude in a time equal to the first bit duration and falls to zero amplitude again in a time equal to a further bit duration.
Claim 2
Dependent Claim
203 words
Telecommunications apparatus for single side-band transmission of a binary data sequence which includes signals of a first kind and signals of a second kind, each signal being of a predetermined bit duration, comprising coder means for converting the binary data sequence to a related. code sequence, a carrier signal generator, gate circuit means connected to receive the said related code sequence from the coder means and to receive carrier wavesignals from the said carrier-wave signal generator, and arranged to opeRate on receipt of each signal representing the signals of the said second kind in the binary data sequence such that a burst of the carrier-wave signal is produced at the output of the gate circuit means and such that successive bursts of the carrier signals are in antiphase; a bandpass filter connected to the output of the gate circuit means and having frequency and amplitude response characteristics such that a half bit duration burst of carrier-wave signal applied at its input produces an output signal of twice the bit duration which rises from zero amplitude to a maximum amplitude in a time equal to the first bit duration and falls to zero amplitude again in a time equal to a further bit duration.
Claim 3
Dependent Claim
109 words
Telecommunications apparatus as claimed in claim 1 wherein the said coder means comprises a three level coder which is arranged to operate upon the signals representing the said first kind in the binary data sequence to produce a mean voltage level for the predetermined bit duration, and to operate on signals representing the second kind in the binary data sequence to produce corresponding pulses, successive pulses being of opposite polarity with respect to the said mean voltage level and each pulse being of half the predetermined bit duration, and wherein the polarity of each pulse determines the phase of the burst of carrier-wave signals applied to the bandpass filter.
Claim 4
Dependent Claim
77 words
Telecommunications apparatus as claimed in claim 1 wherein the said coder means comprises a return-to-zero coder which is arranged to operate on signals representing the first kind in the binary data sequence such that they are unchanged and to operate upon the signals representing the said second kind in the binary data sequence such that they are converted to equal amplitude pulses of half bit duration and of the same polarity with respect to the unchanged signals.
Claim 5
Dependent Claim
145 words
Telecommunications apparatus as claimed in claim 3 wherein the gate circuit means comprises, switch means having an input connected to the coder means for receiving the related code sequence and operative to direct successive pulses representing signals of the said second kind to different ones of two outputs of the switch; two gate circuits each connected to a separate one of the outputs of the switch, and each connected to receive carrier-wave signals from the said carrier-wave signal generator, the carrier-wave signals received by one gate circuit being in antiphase relationship to the carrier-wave signals received by the other gate circuit, summing circuit means connected to receive signals from outputs of the gate circuits for producing a combined sequence of antiphase bursts of carrier signals corresponding to the sequence of pulses representing the signals of the said second kind applied to the said switch means.
Claim 6
Dependent Claim
131 words
Telecommunications apparatus as claimed in claim 3 wherein the said gate circuit means comprises, a bistable circuit connected to the output of the said return-to-zero coder and responsive to the leading edge ofthe pulses in the related code sequence, a first gate circuit having one input connected to an output of the bistable circuit and another input connected to the said carrier signal generator and operative such that the phase of the carrier signal bursts in its output is determined by the polarity of the pulses produced by the bistable, a second gate circuit having one input connected to the output of the return-to-zero coder and a further input connected to the output of the first gate circuit and having an output connected to an input of the single side-band filter.
References Cited (Backward Citations)
US3772598A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |