US3852713A
Expired / Lapsed
US
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Alarm system having pulse pair coding
Assignee: Individual
•
Filing: 1972-05-26
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Granted: 1974-12-03
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Expires: 1992-05-26
Abstract
Abstract An alarm system including generally a transmitter for generating a predetermined signal of pulse pairs in response to the occurrence of a preconceived condition; and a receiver for receiving the signal generated by the transmitter. The receiver detects the pulsed RF signal from the transmitter, generates the proper pulse signal in response thereto, compares the generated signal to a standard reference signal generated by the receiver and generates an alarm or operating signal when a predetermined number of coincidences between the received signal and the standard reference signal occur. In both the analog and digital embodiments, the receiver includes a radio frequency receiver for detecting an RF signal and generating a corresponding signal output, a pulse shaping network for shaping the signal output from the receiver, coincidence means for receiving the pulse signal output from the pulse shaping network, enabling means for selectively enabling the coincidence means to generate an output in response to the receipt of the pulse signal from the pulse shaping network, integrating means for generating an alarm or operating signal output in response to receipt of a predetermined number of outputs within a predetermined time interval from the coincidence means, and noise isolation means for preventing the generation of an alarm signal as the result of a noise signal.
Inventors
- 👤 C Stephenson
- 👤 R Good
- 👤 V Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:49
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/01; G08B25/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
172 words
An alarm system responsive to certain preconceived conditions to produce an alarm signal comprising: transmitter means for generating a signal having pulse pairs with a prescribed time interval between said pulses of each said pulse pair upon occurrence of the preconceived conditions; receiver means for detecting said generated signal and producing a corresponding operating signal output; enabling means operatively connected to said receiver means for generating a reference enabling pulse a predetermined time interval after receipt of said first pulse of said pulse pair equal to said prescribed time interval between said pulses of each said pulse pair; coincidence means operatively connected to said receiver means and said enabling means for generating an output signal pulse upon coincidingly receiving said reference enabling pulse and said second pulse of said pulse pair; and, noise isolation means for preventing further receipt of pulses by said coincidence means from said receiver means after receipt of a second generated pulse from said receiver means after said first generated pulse for a second prescribed period of time.
Claim 2
Dependent Claim
172 words
An alarm system responsive to certain preconceived conditions to produce an alarm signal comprising: transmitter means for generating a signal having pulse pairs with a prescribed time interval between said pulses of each said pulse pair upon occurrence of the preconceived conditions; receiver means for detecting said generated signal and producing a corresponding operating signal output; enabling means operatively connected to said receiver means for generating a reference enabling pulse a predetermined time interval after receipt of said first pulse of said pulse pair equal to said prescribed time interval between said pulses of each said pulse pair; coincidence means operatively connected to said receiver means and said enabling means for generating an output signal pulse upon coincidingly receiving said reference enabling pulse and said second pulse of said pulse pair; and, noise isolation means for preventing further receipt of pulses by said coincidence means from said receiver means after receipt of a second generated pulse from said receiver means after said first generated pulse for a second prescribed period of time.
Claim 3
Dependent Claim
42 words
The alarm system of claiM 1 further including integrating means operatively connected to said coincidence means for generating the alarm signal upon receipt of a prescribed number of said output signal pulses from said coincidence means within a prescribed period of time.
Claim 4
Dependent Claim
92 words
The alarm system of claim 1 wherein said noise isolation means includes latch means operatively connecting said receiver means to said coincidence means, said first generated pulse of said operating signal output from said receiver means corresponding to said first generated pulse of said pulse pair rendering said latch means operative and second generated pulse of said operating signal output from said receiver means corresponding to said second generated pulse of said pulse pair rendering said latch means inoperative while generating a pulse output from said latch means to said coincidence means.
Claim 5
Dependent Claim
92 words
The alarm system of claim 1 wherein said noise isolation means includes flip-flop means operatively connecting said receiver means to said coincidence means, said first generated pulse of said operating signal output from said receiver means corresponding to said first generated pulse of said pulse pair rendering said flip-flop means operative and second generated pulse of said operating signal output from said receiver means corresponding to said second generated pulse of said pulse pair rendering said flip-flop means inoperative while generating a pulse output from said flip-flop means to said coincidence means.
Claim 6
Dependent Claim
242 words
In an alarm system for generating an alarm signal upon receipt of a pulsed radio frequency signal having pulse pairs with a prescribed time interval between the first and second pulses of each pulse pair, detection means conprising: tuned radio frequency receiver means for receiving pulsed radio signals and generating a pulsed signal output corresponding to the received radio frequency signal; coincidence means having a first input operatively connected to said output of said receiver and a second input; enabling means operatively connected to said output of said receiver for generating an output pulse a reference prescribed time interval after receipt of a pulse from said output of said receiver, said reference prescribed time interval corresponding to said time interval of between the first and second pulses of each of pulse pair of the radio frequency signal to be detected, and said output of said enabling means connected to said second input of said coincidence means; said coincidence means generating an alarm output upon coincidence between said output pulse of said enabling means and a pulse of said pulsed signal output of said receiver means; and, noise isolation means operatively connecting said receiver means and said coincidence means, said noise isolation means responsive to the receipt of the next generated pulse from said receiver means after activation of said enabling means to prevent receipt of additional pulses from said receiver means by said coincidence means until said noise isolation means is reset.
Claim 7
Dependent Claim
242 words
In an alarm system for generating an alarm signal upon receipt of a pulsed radio frequency signal having pulse pairs with a prescribed time interval between the first and second pulses of each pulse pair, detection means conprising: tuned radio frequency receiver means for receiving pulsed radio signals and generating a pulsed signal output corresponding to the received radio frequency signal; coincidence means having a first input operatively connected to said output of said receiver and a second input; enabling means operatively connected to said output of said receiver for generating an output pulse a reference prescribed time interval after receipt of a pulse from said output of said receiver, said reference prescribed time interval corresponding to said time interval of between the first and second pulses of each of pulse pair of the radio frequency signal to be detected, and said output of said enabling means connected to said second input of said coincidence means; said coincidence means generating an alarm output upon coincidence between said output pulse of said enabling means and a pulse of said pulsed signal output of said receiver means; and, noise isolation means operatively connecting said receiver means and said coincidence means, said noise isolation means responsive to the receipt of the next generated pulse from said receiver means after activation of said enabling means to prevent receipt of additional pulses from said receiver means by said coincidence means until said noise isolation means is reset.
Claim 8
Dependent Claim
135 words
In the alarm system as set forth in claim 5 wherein said noise isolation means includes a latch circuit means; first monostable multivibrator means having its input connected to said output of said receiver means and its normally high output connected to the set input of said latch circuit means; gating means having one of its inputs connected to said output of said receiver means, the other of its inputs connected to the normally low output of said multivibrator means, and its output connected to the reset input of said latch circuit means; the output of said latch circuit means connected to one input of said coincidence means so that said latch circuit means is locked in a prescribed state upon the change in output of said gating means until retriggering of said multivibrator means.
Claim 9
Dependent Claim
127 words
In the alarm system as set forth in claim 5 wherein said noise isolation means includes gating means having one of its inputs connected to the output of said receiver mEans; first flip-flop means having its input connected to the output of said gating means; and second flip-flop means having its input connected to the normally high input of said first flip-flop means and its normally high output connected to the other input of said gating means; the output of said gating means also connected to one input of said coincidence means, and said first and second flip-flop means rendering said gating means inoperative upon passage of any second pulse from said receiver means until said first and second flip-flop means are preset to their normal states.
Claim 10
Dependent Claim
46 words
In the alarm system as set forth in claim 5 further including integrating means operatively connected to said coincidence means for generating the alarm signal upon receipt of a prescribed number of said alarm output pulses from said coincidence means within a prescribed period of time.
Claim 11
Dependent Claim
105 words
In an alarm system as set forth in claim 6 wherein said enabling means includes second monostable multivibrator means and a first RC coupling network, said second multivibrator means having its logic input connected to said output of said receiver, its inhibit input connected to the normally high output of said first monostable multivibrator means, and its normally high output operatively connected to another input of said coincidence means through said first RC coupling network so that an enabling pulse is supplied to said coincidence means when the normally high output of said second multivibrator means changes from its low state to its high state.
Claim 12
Dependent Claim
87 words
In an alarm system as set forth in claim 9 wherein said noise isolation means further includes a second RC coupling network operatively connecting the output of said latch circuit means to the one input of said coincidence means for returning the one input of said coincidence means back to a low state a prescribed period of time after the one input of said coincidence means is moved to a high state, said second RC coupling network operating independently of the output of said latch circuit means.
Claim 13
Dependent Claim
74 words
In an alarm system as set forth in claim 9 wherein said enabling means further includes third monostable multivibrator means having its logic input operatively connected to the alarm output of said coincidence means and its normally high output operatively connected to the inhibit input of said first monostable multivibrator means for disabling said first multivibrator means for a predetermined period of time upon generation of an alarm signal output from said coincidence means.
Claim 14
Independent Claim
172 words
A method of decoding received multi-pulsed signals having pulse pairs using a two input coincidence system comprising the steps of: generating a reference signal in response to the receipt of the first pulse of the received signal, the reference signal being a pulsed signal having a time interval between initiation of the reference signal and its pulse corresponding to the time interval between pulses of the pulse pairs of the received signal to be decoded; connecting the reference signal to one of the inputs of the coincidence system to enable the coincidence system; connecting the received signal to the other of the inputs of the coincidence system; disconnecting the received signal from the other of the inputs of the coincidence system immediately after receipt of the second pulse of the received signal for a prescribed period of time; and, generating an alarm signal upon the pulse from the reference signal being received at the coincidence system simultaneously with the receipt of the second pulse of the received signal at the coincidence system.
Claim 15
Independent Claim
172 words
A method of decoding received multi-pulsed signals having pulse pairs using a two input coincidence system comprising the steps of: generating a reference signal in response to the receipt of the first pulse of the received signal, the reference signal being a pulsed signal having a time interval between initiation of the reference signal and its pulse corresponding to the time interval between pulses of the pulse pairs of the received signal to be decoded; connecting the reference signal to one of the inputs of the coincidence system to enable the coincidence system; connecting the received signal to the other of the inputs of the coincidence system; disconnecting the received signal from the other of the inputs of the coincidence system immediately after receipt of the second pulse of the received signal for a prescribed period of time; and, generating an alarm signal upon the pulse from the reference signal being received at the coincidence system simultaneously with the receipt of the second pulse of the received signal at the coincidence system.
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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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |