US3684965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digitalized remote control communications system
Assignee: Individual
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Filing: 1970-07-15
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Granted: 1972-08-15
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Expires: 1990-07-15
Abstract
Abstract A transmitter, which remotely controls the demuting of a normally muted receiver, derives a command signal from a carrier wave, the command signal having a frequency f/k1 which is a first precise fraction of the frequency f of the carrier wave. The receiver derives from the received carrier wave a reference signal having a frequency f/K2 which is a second fraction of the frequency f of the carrier wave. The receiver also detects the command signal at frequency f/K1 and derives therefrom successive timing intervals TK1/f. The reference signal cycles are counted during the timing intervals and the count should equal TK1/K2 if the proper command signal has been detected. If this number is counted a control signal is provided for operating a muting/demuting circuit in the receiver. Selective addressing of different receivers can be effected by employing different command signal frequencies for different receivers. In an alternative embodiment, the receivers all respond to the same command signal frequency but respond to different command signal durations. In still another embodiment the receiver derives the timing intervals from the reference signal and counts command signal cycles occuring during these intervals to control the demuting circuit upon appropriate count detection.
Inventors
- 👤 George E Gautney
- 👤 Rowland S Johnson
- 👤 John Piombino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:22
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04W88/022; H04W88/025; H04W88/027
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
212 words
A communications system comprising: a transmitter including: a source of carrier signal; means for deriving a command signal from said carrier signal, said command signal having a frequency which is a sub-multiple of the frequency of said carrier signal; means for selectively modulating said carrier signal with said command signal; and means for transmitting said carrier signal modulated by said command signal; at least one remote receiver including: means for receiving the modulated carrier signal; demodulator means for separating said command signal from the received carrier signal; means for deriving from one of said received carrier signal and said separated command signal a reference signal having a frequency which is a direct function of said one of said received carrier signal and said separated command signal; means for establishing from the other of said received carrier signal and said separated command signal a counter timing interval which is substantially longer than the period of said reference signal; counter means for registering the number of cycles of said reference signal occurring during said counter timing interval; and control means actuable at the termination of said counter timing interval for providing a control signal only if the count in said counting means equals a predetermined number at the termination of said counter timing interval.
Claim 2
Dependent Claim
212 words
A communications system comprising: a transmitter including: a source of carrier signal; means for deriving a command signal from said carrier signal, said command signal having a frequency which is a sub-multiple of the frequency of said carrier signal; means for selectively modulating said carrier signal with said command signal; and means for transmitting said carrier signal modulated by said command signal; at least one remote receiver including: means for receiving the modulated carrier signal; demodulator means for separating said command signal from the received carrier signal; means for deriving from one of said received carrier signal and said separated command signal a reference signal having a frequency which is a direct function of said one of said received carrier signal and said separated command signal; means for establishing from the other of said received carrier signal and said separated command signal a counter timing interval which is substantially longer than the period of said reference signal; counter means for registering the number of cycles of said reference signal occurring during said counter timing interval; and control means actuable at the termination of said counter timing interval for providing a control signal only if the count in said counting means equals a predetermined number at the termination of said counter timing interval.
Claim 3
Dependent Claim
22 words
The system according to claim 1 wherein said receiver includes means for performing a predetermined function in response to said control signal.
Claim 4
Dependent Claim
33 words
The system according to claim 1 wherein said receiver includes means for muting said receiver in the absence of said control signal and for demuting said receiver in response to said control signal.
Claim 5
Dependent Claim
89 words
The system according to claim 1 wherein said control means includes: means for providing a control pulse in response to registry of said predetermined count at said counter means at the termination of said counter time interval; integrating means for charging in response to each control pulse and for discharging in the absence of a control pulse, the discharge rate of said integrating means being significantly slower than its charging rate; and threshold means responsive to a predetermined charge accumulated in said integrator means for providing said control signal.
Claim 6
Dependent Claim
53 words
The system according to claim 1 wherein said reference signal is derived from said received carrier signal, said means for deriving said reference signal comprising first frequency divider means responsive to said received carrier signal for providing said reference signal at a frequency which is a predetermined fraction of the carrier signal frequency.
Claim 7
Dependent Claim
66 words
The system according to claim 5 wherein said means for establishing said counter timing interval comprises further frequency divider means for providing a cyclic signal having a period equal to said counter timing interval whenever said command signal is separated from said carrier signal; said system including means responsive to said cyclic signal for resetting said counter means at the termination of each cyclic signal period.
Claim 8
Dependent Claim
110 words
The system according to claim 6 wherein said control means comprises: sampling means responsive to said cyclic signal for providing a sample pulse at the termination of each cyclic signal period; gating means responsive to said time-coincidence of said sample pulse and registry of said predetermined count at said counter means for providing a control pulse; means responsive to provision of a predetermined number of said control pulses within a specified time for providing said control signal; and means for maintaining said control signal for a predetermined period of time after termination of said control pulses, said predetermined period of time being greater than the period of said cyclic signal.
Claim 9
Dependent Claim
65 words
The system according to claim 7 wherein said predetermined number of counts is determined by the relationship TK1/K2 where K1 is the factor by which the frequency of said command signal is less than the frequency of said carrier signal, K2 is the frequency division factor of said first frequency divider means, and T is the frequency division factor of said further frequency divider means.
Claim 10
Dependent Claim
71 words
The system according to claim 1 wherein said recurring timing interval is established by said separated command signal, said means for establishing including frequency divider means for providing a cyclic signal having a period equal to said counter timing interval whenever said command signal is separated from said carrier signal; said system including means responsive to said cyclic signal for resetting said counter means upon termination of each cyclic signal period.
Claim 11
Dependent Claim
46 words
The system according to claim 1 wherein said reference signal is derived from said separated command signal, said means for deriving said reference signal comprising means for shaping said separated command signal to provide a train of reference pulses at the frequency of said command signal.
Claim 12
Dependent Claim
82 words
The system according to claim 10 wherein said means for establishing said counter timing interval comprises frequency divider means responsive to the received carrier signal for providing a cyclic signal having a period equal to said counter time inTerval whenever said carrier signal is received; said system including means responsive to said cyclic signal and said reference signal for resetting said counter means at the termination of each cyclic signal period in which a command signal is separated from said carrier signal.
Claim 13
Dependent Claim
125 words
The system according to claim 11 wherein said control means comprises: sampling means responsive to said reference signal and said cyclic signal for providing a sample pulse upon termination of each cyclic signal period during which a command signal is separated from said received carrier signal; gating means responsive to time coincidence of said sample pulse and registry of said predetermined count at said counter means for providing a control pulse; means responsive to provision of a predetermined number of said control pulses within a specified time for providing said control signal; and means for maintaining said control signal for a predetermined period of time after termination of said control pulses, said predetermined period of time being greater than the period of said cyclic signal.
Claim 14
Dependent Claim
109 words
The system according to claim 5 wherein said transmitter includes means for selectively varying the duration of modulation of said carrier signal by said command signal; and wherein said means for establishing said counter timing interval comprises: means for providing a predetermined signal level in response to separation of said command signal from said received carrier signal by said demodulator means and for inhibiting said predetermined signal level in the absence of separation of said command signal by said demodulator means; and means for resetting said counter means at the onset of said predetermined signal level and actuating said control means at the termination of said predetermined signal level.
Claim 15
Dependent Claim
63 words
The system according to claim 5 wherein said transmitter includes means selectively varying the duration of modulation of said carrier signal by said command signal; and wherein said means for establishing said counter timing interval comprises: means for resetting said counter means and actuating said control means at the onset of separation of said command from said received carrier by said demodulator means.
Claim 16
Dependent Claim
149 words
A receiver in a communications system of the type in which a carrier signal of frequency f cycles per unit of time is selectively modulated by a command signal derived from said carrier signal and having a frequency f/K1 cycles per unit of time, said receiver comprising: means for receiving said modulated carrier signal; means for deriving a reference signal at frequency f/K2 cycles per unit of time from said received carrier signal; counter means for counting cycles of said reference signal; detector means for separating said command signal from said received carrier signal; means for establishing a counter timing interval from said separated command signal, said counter timing interval having a duration TK1/f units of time; and control means for providing a control signal whenever the number of cycles of said reference signal counted by said counter means during a counter timing interval is equal to approximately TK1/K2
Claim 17
Dependent Claim
149 words
A receiver in a communications system of the type in which a carrier signal of frequency f cycles per unit of time is selectively modulated by a command signal derived from said carrier signal and having a frequency f/K1 cycles per unit of time, said receiver comprising: means for receiving said modulated carrier signal; means for deriving a reference signal at frequency f/K2 cycles per unit of time from said received carrier signal; counter means for counting cycles of said reference signal; detector means for separating said command signal from said received carrier signal; means for establishing a counter timing interval from said separated command signal, said counter timing interval having a duration TK1/f units of time; and control means for providing a control signal whenever the number of cycles of said reference signal counted by said counter means during a counter timing interval is equal to approximately TK1/K2
Claim 18
Dependent Claim
66 words
The receiver according to claim 15 wherein said means for establishing comprises means for generating a repetitive signal of period TK1/f units of time whenever said command signal is separated from said received carrier signal; and wherein said control means comprises means for sampling the count in said counter means and resetting said counter means at a specified time during each cycle of said repetitive signal.
Claim 19
Dependent Claim
93 words
The receiver according to claim 15 wherein said means for establishing comprises means for generating a signal of predetermined level whenever said command signal is separated from said received carrier signal; and wherein said control means includes: means responsive to the onset of said predEtermined level for resetting said counter means, means responsive to termination of said predetermined level for sampling the count in said counter means, and means for providing said control signal only if the time between onset and termination of said predetermined level is equal to TK1/K2 units of time.
Claim 20
Dependent Claim
67 words
The receiver according to claim 15 wherein said control means includes: means for sampling said counter means at each onset of separation of said command signal from said received carrier signal, means for resetting said counter means after each sampling thereof, and means for providing said control signal if the time between successive onsets of separation of said command signal is equal to TK1/K2 units of time.
Claim 21
Dependent Claim
118 words
In a communications system of the type where a transmitted signal is capable of selective modulation to demute specified remote receivers, a transmitter comprising: a source of carrier signal; means for deriving a command signal from said carrier signal, said command signal having a frequency which is a sub-multiple of the frequency of said carrier signal; counter means for counting cycles of said command signal; first means for modulating said carrier signal with said command signal only when the count in said counter means lies within a first range of counts; and second means for modulating said carrier signal with said command signal only when the count in said counter means lies within a second range of counts.
Claim 22
Dependent Claim
118 words
In a communications system of the type where a transmitted signal is capable of selective modulation to demute specified remote receivers, a transmitter comprising: a source of carrier signal; means for deriving a command signal from said carrier signal, said command signal having a frequency which is a sub-multiple of the frequency of said carrier signal; counter means for counting cycles of said command signal; first means for modulating said carrier signal with said command signal only when the count in said counter means lies within a first range of counts; and second means for modulating said carrier signal with said command signal only when the count in said counter means lies within a second range of counts.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |