US3580998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video multiplexer-switcher with sequence recycling upon loss of video
Assignee: Diebold Nixdorf Inc
•
Filing: 1968-12-18
•
Granted: 1971-05-25
•
Expires: 1988-12-18
Abstract
Abstract A plurality of television cameras such as in a closed circuit television system for industrial plant security are provided with a monitoring system including a control module and a plurality of switching modules, one for each camera, and also a single monitoring means such as a television receiver or a video tape recorder or both, at which signals or pictures from the cameras appear sequentially. The monitoring system includes means for enabling the picture from the cameras to be displayed at the monitor successively each for a selected desired length of time; or for enabling any camera to be removed in effect from the system by pressing a button; or for enabling any selected camera to remain connected to the monitor continuously or for any desired period of time merely by the operation of pushbuttons. Flexibility is provided in the system by utilizing monostable regenerative circuits in each video switching module to determine the length of time the corresponding camera remains operatively connected to the monitor and by successively triggering successive switching modules so that a system may be assembled with any desired number of cameras and switching modules. A bistable regenerative circuit is employed in the control module as a clock. Loss of synchronization between the cameras by the monitor is avoided by switching at electronic speeds.
Inventors
- 👤 Robert A Hammond
- 👤 Eugene A Presta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:04
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/18; H04N7/181; H04N5/00; H04N5/222; H04N5/262; H04N5/268
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
168 words
A multiplex system for a plurality of closed circuit television cameras comprising in combination a clock circuit, a trigger circuit having a control terminal responsive to video signal level, a plurality of monostable regenerative pulse forming circuits, one for each of the television cameras to be employed, each monostable circuit having a synchronizing input connection from the clock circuit, a trigger input connection and an output terminal, the trigger input connection of one of said monostable circuits being connected to the said trigger circuit and the trigger input connections of the remaining monostable circuits each being operatively connected to the output terminal of the preceding monostable circuit, and a plurality of gates, each having an input terminal adapted to be connected to one of said television cameras, having a control terminal, and having an output terminal, said output terminals being connected to the control terminal of said trigger, each of said gates having its control terminal connected to the output terminal of one of said monostable regenerative circuits.
Claim 2
Dependent Claim
168 words
A multiplex system for a plurality of closed circuit television cameras comprising in combination a clock circuit, a trigger circuit having a control terminal responsive to video signal level, a plurality of monostable regenerative pulse forming circuits, one for each of the television cameras to be employed, each monostable circuit having a synchronizing input connection from the clock circuit, a trigger input connection and an output terminal, the trigger input connection of one of said monostable circuits being connected to the said trigger circuit and the trigger input connections of the remaining monostable circuits each being operatively connected to the output terminal of the preceding monostable circuit, and a plurality of gates, each having an input terminal adapted to be connected to one of said television cameras, having a control terminal, and having an output terminal, said output terminals being connected to the control terminal of said trigger, each of said gates having its control terminal connected to the output terminal of one of said monostable regenerative circuits.
Claim 3
Dependent Claim
33 words
A system as described in claim 1, wherein a delay circuit is interposed between the output terminal of a monostable regenerative circuit and the input trigger connection of a succeeding monostable regenerative circuit.
Claim 4
Dependent Claim
177 words
A plurality of video switching modules, each having a. An input clock line connected to the output clock line of the control module, b. An input trigger line, connected to the output trigger line of the control module, c. An output trigger line, d. A video signal output line connected to the output video line of the control module, e. A video signal input line for connection to a television camera, f. A gate interposed between the video signal lines of the video switching module and g. Means responsive to the trigger lines and the clock line for opening said gate, said gate being adapted to be opened in response to signals received jointly from the input clock line and the input trigger line of the video switching module, and the input trigger line of one of said video switching modules being connected to the output trigger line of the control module, and the input trigger line of the other video switching modules, each being connected to the output trigger line of another of said modules, and
Claim 5
Dependent Claim
177 words
A plurality of video switching modules, each having a. An input clock line connected to the output clock line of the control module, b. An input trigger line, connected to the output trigger line of the control module, c. An output trigger line, d. A video signal output line connected to the output video line of the control module, e. A video signal input line for connection to a television camera, f. A gate interposed between the video signal lines of the video switching module and g. Means responsive to the trigger lines and the clock line for opening said gate, said gate being adapted to be opened in response to signals received jointly from the input clock line and the input trigger line of the video switching module, and the input trigger line of one of said video switching modules being connected to the output trigger line of the control module, and the input trigger line of the other video switching modules, each being connected to the output trigger line of another of said modules, and
Claim 6
Dependent Claim
177 words
A plurality of video switching modules, each having a. An input clock line connected to the output clock line of the control module, b. An input trigger line, connected to the output trigger line of the control module, c. An output trigger line, d. A video signal output line connected to the output video line of the control module, e. A video signal input line for connection to a television camera, f. A gate interposed between the video signal lines of the video switching module and g. Means responsive to the trigger lines and the clock line for opening said gate, said gate being adapted to be opened in response to signals received jointly from the input clock line anD the input trigger line of the video switching module, and the input trigger line of one of said video switching modules being connected to the output trigger line of the control module, and the input trigger line of the other video switching modules, each being connected to the output trigger line of another of said modules, and
Claim 7
Dependent Claim
177 words
A plurality of video switching modules, each having a. An input clock line connected to the output clock line of the control module, b. An input trigger line, connected to the output trigger line of the control module, c. An output trigger line, d. A video signal output line connected to the output video line of the control module, e. A video signal input line for connection to a television camera, f. A gate interposed between the video signal lines of the video switching module and g. Means responsive to the trigger lines and the clock line for opening said gate, said gate being adapted to be opened in response to signals received jointly from the input clock line anD the input trigger line of the video switching module, and the input trigger line of one of said video switching modules being connected to the output trigger line of the control module, and the input trigger line of the other video switching modules, each being connected to the output trigger line of another of said modules, and
Claim 8
Dependent Claim
177 words
A plurality of video switching modules, each having a. An input clock line connected to the output clock line of the control module, b. An input trigger line, connected to the output trigger line of the control module, c. An output trigger line, d. A video signal output line connected to the output video line of the control module, e. A video signal input line for connection to a television camera, f. A gate interposed between the video signal lines of the video switching module and g. Means responsive to the trigger lines and the clock line for opening said gate, said gate being adapted to be opened in response to signals received jointly from the input clock line and the input trigger line of the video switching module, and the input trigger line of one of said video switching modules being connected to the output trigger line of the control module, and the input trigger line of the other video switching modules, each being connected to the output trigger line of another of said modules, and
Claim 9
Dependent Claim
177 words
A plurality of video switching modules, each having a. An input clock line connected to the output clock line of the control module, b. An input trigger line, connected to the output trigger line of the control module, c. An output trigger line, d. A video signal output line connected to the output video line of the control module, e. A video signal input line for connection to a television camera, f. A gate interposed between the video signal lines of the video switching module and g. Means responsive to the trigger lines and the clock line for opening said gate, said gate being adapted to be opened in response to signals received jointly from the input clock line and the input trigger line of the video switching module, and the input trigger line of one of said video switching modules being connected to the output trigger line of the control module, and the input trigger line of the other video switching modules, each being connected to the output trigger line of another of said modules, and
Claim 10
Dependent Claim
52 words
A television monitoring means connected to the output video line of the control module; the control module also including a trigger and reset circuit having an input terminal connected to the input video line of the control module and an output terminal connected to the output trigger line of the control module.
Claim 11
Dependent Claim
52 words
A television monitoring means connected to the output video line of the control module; the control module also including a trigger and reset circuit having an input terminal connected to the input video line of the control module and an output terminal connected to the output trigger line of the control module.
Claim 12
Dependent Claim
64 words
A television monitoring means connected to the output video line of the control module; and a connection provided in at least one of the video modules for selectively reducing the length of time that the gate is open to a value rendering the video signal on the video monitoring means invisible and effectively eliminating the camera corresponding to said video module from the system.
Claim 13
Dependent Claim
64 words
A television monitoring means connected to the output video line of the control module; and a connection provided in at least one of the video modules for selectively reducing the length of time that the gate is open to a value rendering the video signal on the video monitoring means invisible and effectively eliminating the camera corresponding to said video module from the system.
Claim 14
Dependent Claim
119 words
A multiplex system for a plurality of closed circuit television cameras comprising in combination a plurality of monostable regeneraTive pulse-forming circuits, one for each of the television cameras to be employed; means for synchronizing the monostable circuits; means for successively triggering the monostable circuits from a preceding circuit; a plurality of gates, each having an input terminal adapted to be connected to one of said television cameras, having an output terminal, and having means for opening the gate in response to triggering of one of said monostable circuits; a common video signal line connected to the output terminals of all of said gates for connection to video signal monitoring means; the elements being mounted on modules comprising in combination:
Claim 15
Dependent Claim
119 words
A multiplex system for a plurality of closed circuit television cameras comprising in combination a plurality of monostable regeneraTive pulse-forming circuits, one for each of the television cameras to be employed; means for synchronizing the monostable circuits; means for successively triggering the monostable circuits from a preceding circuit; a plurality of gates, each having an input terminal adapted to be connected to one of said television cameras, having an output terminal, and having means for opening the gate in response to triggering of one of said monostable circuits; a common video signal line connected to the output terminals of all of said gates for connection to video signal monitoring means; the elements being mounted on modules comprising in combination:
Claim 16
Dependent Claim
56 words
A television monitoring means connected to the output video line of the control module; and at least one of switching modules being provided with a connection for preventing passage of the trigger signal to the subsequent switching module and thereby maintaining the camera corresponding to said switching module effectively connected to the television monitoring means continuously.
Claim 17
Dependent Claim
56 words
A television monitoring means connected to the output video line of the control module; and at least one of switching modules being provided with a connection for preventing passage of the trigger signal to the subsequent switching module and thereby maintaining the camera corresponding to said switching module effectively connected to the television monitoring means continuously.
Claim 18
Dependent Claim
119 words
A multiplex system for a plurality of closed circuit television cameras comprising in combination a plurality of monostable regenerative pulse-forming circuits, one for each of the television cameras to be employed; means for synchronizing the monostable circuits; means for successively triggering the monostable circuits from a preceding circuit; a plurality of gates, each having an input terminal adapted to be connected to one of said television cameras, having an output terminal, and having means for opening the gate in response to triggering of one of said monostable circuits; a common video signal line connected to the output terminals of all of said gates for connection to video signal monitoring means; the elements being mounted on modules comprising in combination:
Claim 19
Dependent Claim
119 words
A multiplex system for a plurality of closed circuit television cameras comprising in combination a plurality of monostable regenerative pulse-forming circuits, one for each of the television cameras to be employed; means for synchronizing the monostable circuits; means for successively triggering the monostable circuits from a preceding circuit; a plurality of gates, each having an input terminal adapted to be connected to one of said television cameras, having an output terminal, and having means for opening the gate in response to triggering of one of said monostable circuits; a common video signal line connected to the output terminals of all of said gates for connection to video signal monitoring means; the elements being mounted on modules comprising in combination:
Claim 20
Dependent Claim
119 words
A multiplex system for a plurality of closed circuit television cameras comprising in combination a plurality of monostable regenerative pulse-forming circuits, one for each of the television cameras to be employed; means for synchronizing the monostable circuits; means for successively triggering the monostable circuits from a preceding circuit; a plurality of gates, each having an input terminal adapted to be connected to one of said television cameras, having an output terminal, and having means for opening the gate in response to triggering of one of said monostable circuits; a common video signal line connected to the output terminals of all of said gates for connection to video signal monitoring means; the elements being mounted on modules comprising in combination:
Claim 21
Dependent Claim
119 words
A multiplex system for a plurality of closed circuit television cameras comprising in combination a plurality of monostable regenerative pulse-forming circuits, one for each of the television cameras to be employed; means for synchronizing the monostable circuits; means for successively triggering the monostable circuits from a preceding circuit; a plurality of gates, each having an input terminal adapted to be connected to one of said television cameras, having an output terminal, and having means for opening the gate in response to triggering of one of said monostable circuits; a common video signal line connected to the output terminals of all of said gates for connection to video signal monitoring means; the elements being mounted on modules comprising in combination:
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |