US3686439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone-line installation for keeping a remote watch on premises
Assignee: Fichet Bauche SA
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Filing: 1970-08-24
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Granted: 1972-08-22
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Expires: 1990-08-24
Abstract
Abstract A plurality of sensors at a transmitting station, responsive to different types of disturbances on premises to be kept under surveillance, generate respective bits of a basic binary word which is modulated onto a low-frequency carrier for communication to a receiving station. At the transmitter, an encoder successively converts the basic word into different bit combinations which are then reconverted at the receiver into the original word for evaluation in a shift register. Upon iterative reception of an abnormal code combination, a counter at the receiving station triggers an alarm distinctively indicating the nature of the disturbance on the basis of the improper bit or bits.
Inventors
- 👤 Jean Gerard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:06
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
144 words
A system for the surveillance of protected premises from a remote monitoring office, comprising: a transmitting station on said premises; a receiving station at said monitoring office; a communication channel linking said transmitting station with said receIving station; sensing means on said premises having a normal output in the absence of a disturbance and an abnormal output in the presence of same; sequencing means at said transmitting station connected to said sensing means for forming the output thereof into a recurrent binary word to be transmitted over said channel, said word having bits indicating the normalcy of the output of said sensing means; register means at said receiving station connected to evaluate the bits of each incoming word arriving over said channel; and alarm means controlled by said register means for actuation upon a departure of an arriving word from a predetermined bit combination.
Claim 2
Independent Claim
144 words
A system for the surveillance of protected premises from a remote monitoring office, comprising: a transmitting station on said premises; a receiving station at said monitoring office; a communication channel linking said transmitting station with said receIving station; sensing means on said premises having a normal output in the absence of a disturbance and an abnormal output in the presence of same; sequencing means at said transmitting station connected to said sensing means for forming the output thereof into a recurrent binary word to be transmitted over said channel, said word having bits indicating the normalcy of the output of said sensing means; register means at said receiving station connected to evaluate the bits of each incoming word arriving over said channel; and alarm means controlled by said register means for actuation upon a departure of an arriving word from a predetermined bit combination.
Claim 3
Dependent Claim
69 words
A system as defined in claim 1 wherein said sensing means comprises a plurality of sensors responsive to different types of disturbances, said sequencing means being controlled by said sensors for deriving respective bits of said binary word from individual outputs of said sensors, said alarm means including a plurality of indicators each responsive to a deviation of a respective bit in said arriving word from a prescribed value.
Claim 4
Dependent Claim
61 words
A system as defined in claim 2, further comprising coding means at said transmitting station connected to receive said binary word from said sequencing means for converting same into a predetermined series of modified words, said receiving station being provided with complementary decoding means for reconverting said modified words into said binary word prior to delivery thereof to said register means.
Claim 5
Dependent Claim
54 words
A system as defined in claim 3 wherein said transmitting station includes bit-generating means for adding invariable bits to said binary word, certain of the added bits having unity value, said receiving station being provided with checking means responsive to the absence of an added bit of unity value for actuating said alarm means.
Claim 6
Dependent Claim
39 words
A system as defined in claim 4 wherein said bit-generating means is connected to bypass said coding means in feeding said added bits to said channel, said checking means being connected to said channel ahead of said decoding means.
Claim 7
Dependent Claim
39 words
A system as defined in claim 4 wherein said transmitting and receiving stations are provided with synchronized sources of clock pulses and with respective pulse-counting means connected thereto for controlling the timing of the bits in respective clock cycles.
Claim 8
Dependent Claim
66 words
A system as defined in claim 6 wherein said pulse-counting means at said transmission station is connected to control said bit-generating means for adding a bit of unity value in each of the last two bit positions of a word, said checking means being controlled by said pulse-counting means at said receiving station to ascertain the presence of pulses in both said last two bit positions.
Claim 9
Dependent Claim
25 words
A system as defined in claim 6 wherein said checking means comprises an integrating circuit and a threshold detector in tandem with said integrating circuit.
Claim 10
Dependent Claim
43 words
A system as defined in claim 3 wherein said coding means comprises a binary adder and a shift register connected in a feedback loop of said adder for returning a shifted version of a word from the adder output to the adder input.
Claim 11
Dependent Claim
28 words
A system as defined in claim 9 wherein said feedback loop includes switch means for selecting different outputs of said shift register for return to the adder input.
Claim 12
Dependent Claim
92 words
A system as defined in claim 2, further comprising a word counter at said receiving station connected to be stepped by said register means upon a departure from said predetermined bit combination and to be reset in the absence of such departure, said alarm means being provided with inhibiting means effective in the absence of an enabling pulse emitted by said word counter after a predetermined number of consecutive words with deviating bits, said word counter being provided with resetting means operable by said register means in the absence of said departure.
Claim 13
Dependent Claim
27 words
A system as defined in claim 11 wherein said word counter is provided with switch means for selecting different vAlues for said predetermined number of consecutive words.
Claim 14
Dependent Claim
65 words
A system as defined in claim 1 wherein said transmitting station includes a source of carrier wave and means for modulating said carrier wave with the bits of said binary word, said receiving station being provided with means for demodulating said carrier wave to reconstitute said binary word, said carrier wave having a frequency on the order of ten times the cadence of said bits.
Claim 15
Dependent Claim
57 words
A system as defined in claim 1 wherein said channel comprises a telephone line adapted for the transmission of direct current, further comprising test means connected across said line at one of said stations and a source of direct current connectable across said line at the other of said stations for ascertaining the continuity of the line.
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |