Patent GB536701A successfully refreshed from Google Patents.
US3689888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse position modulated alarm system
Assignee: BALDWIN ELECTRONICS Inc
•
Filing: 1970-12-31
•
Granted: 1972-09-05
•
Expires: 1990-12-31
Abstract
Abstract A system for transmitting, via a radio link to a central station, alarm indications at a plurality of monitored stations. Each monitored station includes a different code identification number which controls pulse position modulation of a carrier that is transmitted to the central station only in response to an alarm condition being sensed. The type of alarm condition being sensed also pulse position modulates the carrier transmitted from the peripheral station to the central station. At the central station, the carrier is received and the pulse position modulated pulses are detected and processed to provide indications of the identity of the monitored station at which the alarm condition was sensed, as well as the cause of the sensed alarm.
Inventors
- 👤 Thomas S Wootton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:28
CPC Classifications
F; F25; F25D; F25D29/00; F25D29/008; G; G08; G08B; G08B25/00; G08B25/009
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
196 words
A system for transmitting to a central station an indication of the existence, at any one of a plurality of peripheral stations, of any one of several possible alarm conditions, comprising, in combination, means for deriving a signal in response to the occurrence of any one of said conditions, frame generating means responsive to said signal for generating a predetermined plurality of repetitive sequential substantially identical data frames, said frame generating means including data channel producing means for producing a plurality of repetitive data channels each enduring for a discrete multiple of a predetermined unit time elapse, said data channels being respectively indicative of the identity of said peripheral station and the condition at said peripheral station; said frame generating means including means for providing a distinguishable timing signal characteristic of the first channel of each frame to distinguish same from other channels of each frame, and means for transmitting said predetermined plurality of data frames to said central station, wherein is provided means to assure that the last of said plurality of frames terminates in said distinguishable timing signal characteristic and the first of each of said channels commences with said distinguishable timing signal characteristic.
Claim 2
Independent Claim
196 words
A system for transmitting to a central station an indication of the existence, at any one of a plurality of peripheral stations, of any one of several possible alarm conditions, comprising, in combination, means for deriving a signal in response to the occurrence of any one of said conditions, frame generating means responsive to said signal for generating a predetermined plurality of repetitive sequential substantially identical data frames, said frame generating means including data channel producing means for producing a plurality of repetitive data channels each enduring for a discrete multiple of a predetermined unit time elapse, said data channels being respectively indicative of the identity of said peripheral station and the condition at said peripheral station; said frame generating means including means for providing a distinguishable timing signal characteristic of the first channel of each frame to distinguish same from other channels of each frame, and means for transmitting said predetermined plurality of data frames to said central station, wherein is provided means to assure that the last of said plurality of frames terminates in said distinguishable timing signal characteristic and the first of each of said channels commences with said distinguishable timing signal characteristic.
Claim 3
Dependent Claim
96 words
A system according to claim 1, wherein said each of said peripheral stations includes a normally disabled radio wave transmitter, control means responsive only to the initiation of one of said conditions for conditioning said transmitter to transmit a radio wave for only a predetermined time interval, and modulating means for modulating said radio wave according to the time durations of said channels and the identifiable timing signal characteristics of said channel of each of said repetitive data frames and means for terminating said predetermined time interval only co-incidentally with termination of one of said frames.
Claim 4
Dependent Claim
119 words
A peripheral station according to claim 2, wherein said control means includes means for periodically enabling said transmitter to an on condition for groups of said frames separated respectively by blank intervals of about twice the duration of any of said groups, and means responsive to said frame generating means to enable said transmitter at the beginning of each of said frames in response to said identifiable signal characteristic of said one channel of a first frame and to disable said transmitter after the end of one of said frames in response to the occurrence of said identifiable signal characteristic of an immediately following frame, whereby only complete frames of data are transmitted during each of said on conditions.
Claim 5
Dependent Claim
85 words
A peripheral station according to claim 1, wherein said several conditions are alarm conditions, wherein said means for deriving a signal in response to the occurrence of an alarm condition is responsive to any one of several alarm condition detectors at the peripheral station, wherein one of said channels has a time duration identifying the alarm condition occurring at the peripheral station, and wherein the time durations of the remaining channels of each frame are digitally indicative of the identification of the transmitting peripheral station.
Claim 6
Dependent Claim
142 words
A peripheral station according to claim 4, wherein said frame generating means generates a plurality of time spaced pulses during each frame, corresponding portions of adjacent ones of said pulses defining a data channel, the time duration of a first channel of each frame being indicative of the alarm condition occurring at the peripheral station, and said means for providing an identifiable signal characteristic to one of said channels provides said signal characteristic to the first channel and includes code generator means responsive to the output of an alarm condition detector sensing an alarm condition, said several alarm condition detectors each including time constant circuit means conNectable to said code generating means in response to the occurrence of an alarm condition to condition said code generating means to produce pulses defining a channel of a duration indicative of the sensed alarm condition.
Claim 7
Dependent Claim
35 words
A peripheral station according to claim 5, wherein said channel generating means further includes number generator means for generating pulses defining channels of durations indicative of a plural number numerical identification of the peripheral station.
Claim 8
Dependent Claim
110 words
A radio alarm system, comprising geographically separated transmitter means for transmitting groups of information bearing frames separated by inactive periods each enduring about twice as long as one of said groups of information bearing frames, wherein said frames deriving from separate ones of said geographically separated transmitters are of random relative lengths, means for initiating transmissions of said information groups from separate ones of said transmitters at random times, and means for limiting the time of a transmission from any one of said transmitters to only but not less than several minutes, wherein is provided means for terminating said transmissions only in response to completion of one of said frames.
Claim 9
Dependent Claim
110 words
A radio alarm system, comprising geographically separated transmitter means for transmitting groups of information bearing frames separated by inactive periods each enduring about twice as long as one of said groups of information bearing frames, wherein said frames deriving from separate ones of said geographically separated transmitters are of random relative lengths, means for initiating transmissions of said information groups from separate ones of said transmitters at random times, and means for limiting the time of a transmission from any one of said transmitters to only but not less than several minutes, wherein is provided means for terminating said transmissions only in response to completion of one of said frames.
Claim 10
Dependent Claim
113 words
In an alarm transmitter, means for transmitting a group of successive information bearing frames, said means including means responsive to occurrence of a random event for generating a pulse of first duration for all said frames, means responsive to completion of said pulse for generating a time quantized signal representing by its duration the character of said random event, means responsive to completion of said signal for generating a sequential plurality of further time quantized signals having together a multi-digit significance, and means terminating each of said frames with one of said pulses of first duration constituting the initial pulse of a succeeding frame for all except the last frame of said group.
Claim 11
Dependent Claim
113 words
In an alarm transmitter, means for transmitting a group of successive information bearing frames, said means including means responsive to occurrence of a random event for generating a pulse of first duration for all said frames, means responsive to completion of said pulse for generating a time quantized signal representing by its duration the character of said random event, means responsive to completion of said signal for generating a sequential plurality of further time quantized signals having together a multi-digit significance, and means terminating each of said frames with one of said pulses of first duration constituting the initial pulse of a succeeding frame for all except the last frame of said group.
Claim 12
Dependent Claim
177 words
In an alarm system, a satellite radio station including a plurality of condition detector circuits, means responsive to detector circuits for initiating transmission of a pattern of information bearing pulse position modulated frames from said satellite radio station, the first pulse ofeach of said frames having a characteristic distinguishing said first pulse from all other pulses of said frames, means responsive to the one of said condition detector circuits which detects an alarm condition for generating a second pulse separated from said first pulse by a time interval equal to a multiple of a basic time interval, said multiple identifying said one of said condition detector circuits, means responsive to said second pulse for generating further pulses each separated from the pulse preceding itself by a time interval which is digitally decimally coded in terms of said basic time interval, the last of said further pulses being said first pulse of a succeeding frame and having said characteristic and the coding of said decimally coded pulses identifying said satellite radio station in terms of a multi-digit number.
Claim 13
Dependent Claim
177 words
In an alarm system, a satellite radio station including a plurality of condition detector circuits, means responsive to detector circuits for initiating transmission of a pattern of information bearing pulse position modulated frames from said satellite radio station, the first pulse ofeach of said frames having a characteristic distinguishing said first pulse from all other pulses of said frames, means responsive to the one of said condition detector circuits which detects an alarm condition for generating a second pulse separated from said first pulse by a time interval equal to a multiple of a basic time interval, said multiple identifying said one of said condition detector circuits, means responsive to said second pulse for generating further pulses each separated from the pulse preceding itself by a time interval which is digitally decimally coded in terms of said basic time interval, the last of said further pulses being said first pulse of a succeeding frame and having said characteristic and the coding of said decimally coded pulses identifying said satellite radio station in terms of a multi-digit number.
Claim 14
Dependent Claim
62 words
The combination according to claim 9, wherein is provided means for transmitting said frames in a period of several minutes only, said period consisting of groups of said frames separated by silent intervals unoccupied by said frames on at least a 20 percent duty cycle basis, and means for terminating said period only in response to termination of one of said frames.
Claim 15
Dependent Claim
65 words
The combination according to claim 9, wherein is further included a central station having means responsive to said frames to record in response to each of said frames a record of the identity of said satellite station and the identity of said adverse condition, and means for disabling said means to record in response to reception of an abnormal format of one of said frames.
Claim 16
Dependent Claim
149 words
In a satellite alarm system, plural satellite stations each including an associated normally unenergized radio transmitter, an alarm condition sensing system at each station, means responsive to sensing of an alarm by said alarm condition sensing system for energizing the associated transmitter for a predetermined time interval of the order of several minutes, said transmitter including means for transmitting information bearing time position modulated plural pulse frames during said time interval, each of said frames including a master pulse of the same duration, and means for terminating said time interval only in coincidence with occurrence of one of said master pulses, said master pulses each defining concurrently the beginning of one frame and the termination of a preceding frame, said frames including plural pulses separated by information bearing digitally coded spaces which are diverse for different ones of said satellite stations and serve as identification of said satellite stations.
Claim 17
Dependent Claim
149 words
In a satellite alarm system, plural satellite stations each including an associated normally unenergized radio transmitter, an alarm condition sensing system at each station, means responsive to sensing of an alarm by said alarm condition sensing system for energizing the associated transmitter for a predetermined time interval of the order of several minutes, said transmitter including means for transmitting information bearing time position modulated plural pulse frames during said time interval, each of said frames including a master pulse of the same duration, and means for terminating said time interval only in coincidence with occurrence of one of said master pulses, said master pulses each defining concurrently the beginning of one frame and the termination of a preceding frame, said frames including plural pulses separated by information bearing digitally coded spaces which are diverse for different ones of said satellite stations and serve as identification of said satellite stations.
Claim 18
Dependent Claim
70 words
The combination according to claim 12, wherein said means for energizing includes means for alternately energizing and then de-energizing said transmitter periodically for groups of plural successive integral frames during said predetermined time interval with an on the order of a 33 percent duty cycle, and means for initiating and terminating each of said groups of plural frames during which said transmitter is energized only in coincidence with master pulses.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |