US3691464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asynchronous, swept frequency communication system
Assignee: Technical Communications Corp
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Filing: 1968-11-25
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Granted: 1972-09-12
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Expires: 1988-11-25
Abstract
Abstract A communication system for transmitting information in digital form from a transmitter to a receiver through a noisy or disturbed channel. Each digit of the digital data to be transmitted is modulated or encoded as one or more radio frequency pulses, each radio frequency pulse being frequency modulated in a distinctive manner in accordance with a predetermined continuous function for at least a portion of its duration. The receiver is constructed to uniquely receive data so modulated or encoded. Two embodiments are described. In one embodiment the data to be transmitted is in the form of pulses and each data pulse is encoded into a plurality of frequency modulated radio frequency pulses. In a second embodiment the data is a series of ''''ones'''' and ''''zeros'''' and each one and zero is represented by a pulse of radio frequency energy. Each pulse is frequency modulated in a distinctive manner to identify it as a ''''1'''' or a ''''0.
Inventors
- 👤 David S Dayton
- 👤 Alfred L Girard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:29
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/18; H04W88/185; H04W88/188; H04L; H04L27/00; H04L27/10; H04L27/103; H04L27/26; H04L5/00; H04L5/22; H04L5/26
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
181 words
Apparatus for communication between a transmitting location and a receiver location on a predetermined band of frequencies, comprising, in combination, 1. at said transmitter location: a. a source of electrical signals to be transmitted to said receiver location b. a modulating circuit for providing at least one fixed amplitude radio frequency signal whose frequency varies according to a predetermined continuous function, during a predetermined interval, said modulating circuit being activated by signals from said source, c. a power amplifier d. a transmitting antenna connected to said power amplifier e. means connecting said modulated signal to said power amplifier for amplification and transmission from said antenna; and 2. at said receiver location: a. a radio receiver capable of receiving transmissions from said transmitter location; b. a signal demodulator, said demodulator providing an output signal only in response to signals whose frequency varies according to said predetermined continuous function during said predetermined time interval c. means connecting said received signals to said demodulator, the output signal from said demodulator corresponding to the electrical signal activating said modulator to produce said radio frequency signal.
Claim 2
Dependent Claim
181 words
Apparatus for communication between a transmitting location and a receiver location on a predetermined band of frequencies, comprising, in combination, 1. at said transmitter location: a. a source of electrical signals to be transmitted to said receiver location b. a modulating circuit for providing at least one fixed amplitude radio frequency signal whose frequency varies according to a predetermined continuous function, during a predetermined interval, said modulating circuit being activated by signals from said source, c. a power amplifier d. a transmitting antenna connected to said power amplifier e. means connecting said modulated signal to said power amplifier for amplification and transmission from said antenna; and 2. at said receiver location: a. a radio receiver capable of receiving transmissions from said transmitter location; b. a signal demodulator, said demodulator providing an output signal only in response to signals whose frequency varies according to said predetermined continuous function during said predetermined time interval c. means connecting said received signals to said demodulator, the output signal from said demodulator corresponding to the electrical signal activating said modulator to produce said radio frequency signal.
Claim 3
Dependent Claim
74 words
at said receiver location: a. a radio receiver capable of receiving transmissions from said transmitter location; b. a signal demodulator, said demodulator providing an output signal only in response to signals whose frequency varies according to said predetermined continuous function during said predetermined time interval c. means connecting said received signals to said demodulator, the output signal from said demodulator corresponding to the electrical signal activating said modulator to produce said radio frequency signal.
Claim 4
Dependent Claim
74 words
at said receiver location: a. a radio receiver capable of receiving transmissions from said transmitter location; b. a signal demodulator, said demodulator providing an output signal only in response to signals whose frequency varies according to said predetermined continuous function during said predetermined time interval c. means connecting said received signals to said demodulator, the output signal from said demodulator corresponding to the electrical signal activating said modulator to produce said radio frequency signal.
Claim 5
Dependent Claim
24 words
The combination defined in claim 1 in which the frequency of the radio frequency signal from said modulator varies in a substantially linear manner.
Claim 6
Dependent Claim
112 words
at said receiver location: a. radio receiver capable of receiving transmissions from said transmitter location; b. a demodulator, selectively responsive to pulses whose frequency varies according to either of said predetermined continuous functions, said demodulator responding to a pulse whose frequency varies according to said first predetermined continuous function by generating an output corresponding to a binary zero and to a pulse whose frequency varies according to said second predetermined continuous function by generating an output corresponding to a binary one c. means connecting said received signals to said demodulator, the output signal from said demodulator corresponding to the electrical signal received by said modulator to produce said transmitted radio frequency signal.
Claim 7
Dependent Claim
112 words
at said receiver location: a. radio receiver capable of receiving transmissions from said transmitter location; b. a demodulator, selectively responsive to pulses whose frequency varies according to either of said predetermined continuous functions, said demodulator responding to a pulse whose frequency varies according to said first predetermined continuous function by generating an output corresponding to a binary zero and to a pulse whose frequency varies according to said second predetermined continuous function by generating an output corresponding to a binary one c. means connecting said received signals to said demodulator, the output signal from said demodulator corresponding to the electrical signal received by said modulator to produce said transmitted radio frequency signal.
Claim 8
Dependent Claim
81 words
at said receiver location: a. a radio receiver capable of receiving said transmitted radio-frequency signals from said transmitter b. an address decoder, said decoder providing an output signal only in response to signals whose frequency varies according to said predetermined continuous function during said predetermined time interval c. means connecting said received signal to said address decoder, the output signal from said address decoder corresponding to the pulse signal activating said address encoder to produce said fixed amplitude radio frequency signal.
Claim 9
Dependent Claim
81 words
at said receiver location: a. a radio receiver capable of receiving said transmitted radio-frequency signals from said transmitter b. an address decoder, said decoder providing an output signal only in response to signals whose frequency varies according to said predetermined continuous function during said predetermined time interval c. means connecting said received signal to said address decoder, the output signal from said address decoder corresponding to the pulse signal activating said address encoder to produce said fixed amplitude radio frequency signal.
Claim 10
Dependent Claim
75 words
The combination defined in claim 1 in which said power amplifier transmits a first portion of said modulated signal during a first interval of time and a second portion during a second interval of time, the carrier frequency of said transmitted signal being different during said first and second time intervals; said receiver being capable of receiving both of said signals and said demodulator being selectively responsive to signals transmitted during said selected time intervals.
Claim 11
Dependent Claim
94 words
The combination defined in claim 1 in which said modulator provides a plurality of fixed radio frequency signals, the frequency of each varying according to individual predetermined continuous functions during a predetermined interval, and in which said demodulator includes a delay line for each fixed amplitude radio frequency signal into which said electrical signals are encoded, a coincidence circuit, means connecting the signals from said delay lines to said coincidence circuit, said coincidence circuit providing an output signal only when each of said delay lines provide an output signal in a predetermined time sequence.
Claim 12
Dependent Claim
23 words
Apparatus for selective communication of signals in pulse form between a transmitting location and a receiver location on a predetermined band of frequencies,
Claim 13
Dependent Claim
23 words
Apparatus for selective communication of signals in pulse form between a transmitting location and a receiver location on a predetermined band of frequencies,
Claim 14
Dependent Claim
176 words
A communication system for transmitting information in pulse form between a first and a second station comprising in combination a transmitter and an address encoder at said first station, said address encoder providing at least one fixed amplitude signal whose frequency continuously varies as a function of time in a predetermined manner to modulate said transmitter during the interval when a signal corresponding to a pulse is to be transmitted, and providing no signal to said transmitter during the interval when no pulse is to be transmitted, a receiver adapted to receive the signals transmitted by said transmitter and an address decoder at said second station, said address decoder providing an output only in response to the presence of said predetermined frequency variations in the received signal to provide a pulse output signal, and otherwise providing no pulse output signal, the presence of a pulse in said address decoder output signal thereby indicating the presence of a pulse at said transmitter and the absence of a pulse indicating the absence of a pulse at said transmitter.
Claim 15
Dependent Claim
176 words
A communication system for transmitting information in pulse form between a first and a second station comprising in combination a transmitter and an address encoder at said first station, said address encoder providing at least one fixed amplitude signal whose frequency continuously varies as a function of time in a predetermined manner to modulate said transmitter during the interval when a signal corresponding to a pulse is to be transmitted, and providing no signal to said transmitter during the interval when no pulse is to be transmitted, a receiver adapted to receive the signals transmitted by said transmitter and an address decoder at said second station, said address decoder providing an output only in response to the presence of said predetermined frequency variations in the received signal to provide a pulse output signal, and otherwise providing no pulse output signal, the presence of a pulse in said address decoder output signal thereby indicating the presence of a pulse at said transmitter and the absence of a pulse indicating the absence of a pulse at said transmitter.
Claim 16
Dependent Claim
26 words
The combination defined in claim 6 in which the continuous variation in frequency of said address encoder signal is substantially linear as a function of time.
Claim 17
Dependent Claim
71 words
The combination defined in claim 6 in which said transmitter transmits a portion of said address encoder signal during a first interval of time and another portion during a second interval of time, the transmitter carrier frequency being different during said first and second time interval; said receiver being capable of receiving both of said signals and said address decoder being selectively responsive to signals transmitted during said selected time intervals.
Claim 18
Dependent Claim
145 words
A communication system for communicating information in the form of pulses of electrical energy from a transmitting to a receiving location comprising in combination, a source of signal pulses, an address encoder, means connecting said signal pulses to said address encoder, said address encoder converting each of said signal pulses to a plurality of pulses of radio frequency energy, each of said radio frequency pulses being frequency modulated according to a predetermined continuous function, means for amplifying and transmitting said radio frequency pulses, a receiver at said receiver location adapted to receive the signals from said transmitter, an address decoder, means connecting said receiver signals to said address decoder, said address decoder being selectively responsive to the number, spacing, frequency and predetermined frequency modulation of said received radio frequency pulses to produce an output pulse correspOnding to the signal pulse supplied to said address encoder.
Claim 19
Dependent Claim
145 words
A communication system for communicating information in the form of pulses of electrical energy from a transmitting to a receiving location comprising in combination, a source of signal pulses, an address encoder, means connecting said signal pulses to said address encoder, said address encoder converting each of said signal pulses to a plurality of pulses of radio frequency energy, each of said radio frequency pulses being frequency modulated according to a predetermined continuous function, means for amplifying and transmitting said radio frequency pulses, a receiver at said receiver location adapted to receive the signals from said transmitter, an address decoder, means connecting said receiver signals to said address decoder, said address decoder being selectively responsive to the number, spacing, frequency and predetermined frequency modulation of said received radio frequency pulses to produce an output pulse correspOnding to the signal pulse supplied to said address encoder.
Claim 20
Dependent Claim
116 words
The combination defined in claim 9 in which said address decoder includes a frequency translator, a plurality of narrow band filters supplied by said frequency translator, a tapped delay line for each of the radio frequency pulses into which pulses from said source are encoded at said transmitted location, means for detecting the output signals from each of said filters, and means connecting the output signal from said detectors to said delay lines, a logical coincidence circuit, and means connecting the output signals from said tapped delay lines to said coincidence circuit, said coincidence circuit providing an output signal only when each of said tapped delay lines provides an output signal in a predetermined time sequence.
Claim 21
Dependent Claim
99 words
The combination defined in claim 9 in which said address decoder includes a frequency translator, a plurality of dispersive delay lines supplied by said frequency translator, one of said delay lines being provided for each of the radio frequency pulses into which pulses from said source are encoded at said transmitter location, a logical coincidence circuit, means including detecting means for connecting the output signals from said dispersive delay lines to the logical coincidence circuit, said coincidence circuit providing an output signal only when each of said dispersive delay lines provide an output signal in a predetermined time sequence.
Claim 22
Dependent Claim
25 words
Apparatus for selective communication between a transmitting location and a receiver location through a transmitting medium on a predetermined band of frequencies, comprising, in combination,
Claim 23
Dependent Claim
25 words
Apparatus for selective communication between a transmitting location and a receiver location through a transmitting medium on a predetermined band of frequencies, comprising, in combination,
Claim 24
Dependent Claim
90 words
The combination defined in claim 12 in which said demodulator includes frequency translating means, a pair of dispersive delay lines supplied with electrical signals from said frequency translating means one of said delay lines being responsive to pulses corresponding to zeros in the transmitted data and a second of said delay lines being responsive to pulses corresponding to ones in the transmitted data and a decision making circuit responsive to signals from said delay lines to determine whether a one or a zero is received in a given predetermined period.
Claim 25
Dependent Claim
78 words
The combination defined in claim 13 which includes a cOntrollable oscillator located at said receiver, means responsive to the signal from said oscillator for generating timing pulses for use in said receiver, said timing pulses including a sampling pulse for sampling the signals from said delay lines, means supplying the average value of said sampled received pulses from said delay lines as a signal to control said oscillator frequency, thereby synchronizing the timing of said receiver and transmitter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |