US3715515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shift-register re-entry scanner with confirmation scan for detected disparity
Assignee: Plessey Handel und Investments AG
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Filing: 1971-05-25
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Granted: 1973-02-06
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Expires: 1991-05-25
Abstract
Abstract In automatic telephone exchanges of the stored-programcontrolled type it is necessary for information randomly initiated at telephone peripherals (subs. line circuits, markers, junction relay sets etc) to be communicated to the central data processing equipment. The peripherals may be single or multiple signal-initiating points (e.g., relay ''''make'''' contacts which may randomly change their states). The proposal enables a single form of circuit to be used for say 96 signal-initiating points relevant to single or multiple-point peripherals or combinations thereof. The circuit comprises a shift register SR for storing the state of each signalling of the block and means S for scanning the signalling points to determine their states. The shift register and scanner are so co-ordinated as to enable the state of each point, at the time which it is scanned, to be compared with its previously stored state. If one or more changes of state are detected during the scanning cycle, the comparison cycle is repeated to confirm that a change-of-state was not of a transient nature (i.e., due to ''''contact-bounce'''') and, if the states are confirmed, connection to the data processing equipment is demanded and the states of all the signalling points (changed and unchanged) now stored in the shift register are transmitted from the shift-register as a high-speed pulse train. During transmission, a re-circulation path is provided by the register so that upon conclusion of transmission it is again available for the comparison function when scanning now resumes.
Inventors
- 👤 H Stirling
- 👤 J Price
- 👤 R Williams
- 👤 P Hampson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:10
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54; H04Q3/545; H04Q3/54575; H04Q3/54591; G; G06; G06F; G06F13/00; G06F13/14; G06F13/20; G06F13/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
359 words
In or for use in a data processing system, a circuit arrangement for transmitting information which it derives frOm a plurality of two-state signalling points according to their states and appertaining to one or more peripheral equipments serving a data processor, characterized in that it comprises a) scanning means for sequentially and repetitively scanning said signalling points and operative to produce a signalling-point signal appropriate to the state of each signalling point at the time which it is scanned, b) a single shift-register having at least as many stages as there are signalling points and arranged to store said signalling-point signals produced by the scanner, c) comparison means controlled from the input lead and output lead of the first and last stages respectively of the shift-register for assessing each said signal when it is produced by said scanning means in relation to that signal of the relevant signalling point which was stored by the shift-register when said point was last scanned, the comparison means being arranged to generate a change-of-state signal in the event of disparity between the currently produced signal and said previously stored signal, and d) control means which is responsive to any said change-of-state signal, to condition itself on conclusion of scanning of the signalling points to cause the scanning means to perform a confirmatory scanning and storage cycle with respect to said group of signalling points, and the control means is further operative upon completion of the confirmatory scanning cycle, without intervention of a further change-of-state signal, to cause the signals currently stored in the shift-register to be transmitted over an output path, the transmitted signals comprising a series of pulses appropriate to the confirmed states of the signalling points and being derived successively from the last stage of the shift-register as a result of a series of strobe pulses being applied to that shift-register, and said control means is operative, during transmission of stored signals, to inhibit signalling-point signals and to cause the transmitted signals to be successively re-entered into the shift-register over a path, completed during transmission, between the output lead of the last stage and the input lead of the first stage.
Claim 2
Dependent Claim
359 words
In or for use in a data processing system, a circuit arrangement for transmitting information which it derives frOm a plurality of two-state signalling points according to their states and appertaining to one or more peripheral equipments serving a data processor, characterized in that it comprises a) scanning means for sequentially and repetitively scanning said signalling points and operative to produce a signalling-point signal appropriate to the state of each signalling point at the time which it is scanned, b) a single shift-register having at least as many stages as there are signalling points and arranged to store said signalling-point signals produced by the scanner, c) comparison means controlled from the input lead and output lead of the first and last stages respectively of the shift-register for assessing each said signal when it is produced by said scanning means in relation to that signal of the relevant signalling point which was stored by the shift-register when said point was last scanned, the comparison means being arranged to generate a change-of-state signal in the event of disparity between the currently produced signal and said previously stored signal, and d) control means which is responsive to any said change-of-state signal, to condition itself on conclusion of scanning of the signalling points to cause the scanning means to perform a confirmatory scanning and storage cycle with respect to said group of signalling points, and the control means is further operative upon completion of the confirmatory scanning cycle, without intervention of a further change-of-state signal, to cause the signals currently stored in the shift-register to be transmitted over an output path, the transmitted signals comprising a series of pulses appropriate to the confirmed states of the signalling points and being derived successively from the last stage of the shift-register as a result of a series of strobe pulses being applied to that shift-register, and said control means is operative, during transmission of stored signals, to inhibit signalling-point signals and to cause the transmitted signals to be successively re-entered into the shift-register over a path, completed during transmission, between the output lead of the last stage and the input lead of the first stage.
Claim 3
Dependent Claim
359 words
In or for use in a data processing system, a circuit arrangement for transmitting information which it derives frOm a plurality of two-state signalling points according to their states and appertaining to one or more peripheral equipments serving a data processor, characterized in that it comprises a) scanning means for sequentially and repetitively scanning said signalling points and operative to produce a signalling-point signal appropriate to the state of each signalling point at the time which it is scanned, b) a single shift-register having at least as many stages as there are signalling points and arranged to store said signalling-point signals produced by the scanner, c) comparison means controlled from the input lead and output lead of the first and last stages respectively of the shiftregister for assessing each said signal when it is produced by said scanning means in relation to that signal of the relevant signalling point which was stored by the shift-register when said point was last scanned, the comparison means being arranged to generate a change-of-state signal in the event of disparity between the currently produced signal and said previously stored signal, and d) control means which is responsive to any said change-of-state signal, to condition itself on conclusion of scanning of the signalling points to cause the scanning means to perform a confirmatory scanning and storage cycle with respect to said group of signalling points, and the control means is further operative upon completion of the confirmatory scanning cycle, without intervention of a further change-of-state signal, to cause the signals currently stored in the shift-register to be transmitted over an output path, the transmitted signals comprising a series of pulses appropriate to the confirmed states of the signalling points and being derived successively from the last stage of the shift-register as a result of a series of strobe pulses being applied to that shift-register, and said control means is operative, during transmission of stored signals, to inhibit signalling-point signals and to cause the transmitted signals to be successively re-entered into the shiftregister over a path, completed during transmission, between the output lead of the last stage and the input lead of the first stage.
Claim 4
Dependent Claim
359 words
In or for use in a data processing system, a circuit arrangement for transmitting information which it derives frOm a plurality of two-state signalling points according to their states and appertaining to one or more peripheral equipments serving a data processor, characterized in that it comprises a) scanning means for sequentially and repetitively scanning said signalling points and operative to produce a signalling-point signal appropriate to the state of each signalling point at the time which it is scanned, b) a single shift-register having at least as many stages as there are signalling points and arranged to store said signalling-point signals produced by the scanner, c) comparison means controlled from the input lead and output lead of the first and last stages respectively of the shiftregister for assessing each said signal when it is produced by said scanning means in relation to that signal of the relevant signalling point which was stored by the shift-register when said point was last scanned, the comparison means being arranged to generate a change-of-state signal in the event of disparity between the currently produced signal and said previously stored signal, and d) control means which is responsive to any said change-of-state signal, to condition itself on conclusion of scanning of the signalling points to cause the scanning means to perform a confirmatory scanning and storage cycle with respect to said group of signalling points, and the control means is further operative upon completion of the confirmatory scanning cycle, without intervention of a further change-of-state signal, to cause the signals currently stored in the shift-register to be transmitted over an output path, the transmitted signals comprising a series of pulses appropriate to the confirmed states of the signalling points and being derived successively from the last stage of the shift-register as a result of a series of strobe pulses being applied to that shift-register, and said control means is operative, during transmission of stored signals, to inhibit signalling-point signals and to cause the transmitted signals to be successively re-entered into the shiftregister over a path, completed during transmission, between the output lead of the last stage and the input lead of the first stage.
Claim 5
Dependent Claim
348 words
In or for use in a data processing system a circuit arrangement for transmitting information which it derives from two-state signalling points arranged in a plurality of groups and incorporated in peripheral equipments serving a data processor, characterized in that it comprises a) scanning means for sequentially and repetitively scanning said signalling points in a group-after-group order and operative to produce a signalling-point signal appropriate to the state of each signalling point at the time which it is scanned, b) one identical shift-register for each group of signalling points, each said shift-register having at least as many stages as there are signalling points in the group and being arranged to store said signals produced during scanning of all the signalling points of the group, c) comparison means, controlled from the input lead and output lead of the first and last stage respectively of each shift-register, for assessing each said signal when it is produced by said scanning means in relation to that signal of the relevant signalling point which was stored by a shift-register when said point was last scanned, the comparison means being arranged to generate a change-of-state signal in the event of disparity between the currently-produced signal and said previously-stored signal, and d) control means which is responsive to any said change-of-state signal to condition itself, on conclusion of the scanning and storage functions appertaining to the particular group of signalling points, in such manner as to inhibit scanning of another group of signalling points and to cause the scanning means and the particular shift-register to re-institute the scanning and storage functions with respect to the particular group of signalling points, and the control means is further operative when said functions have been comPleted, without intervention of a further change-of-state signal, to cause the signals stored in the particular shift-register to be transmitted as a pulse series over an output lead concurrently with the re-entry of said signals into the shift-register over a path, completed during transmission, between the output lead of the last stage and the input lead of the first stage of the shift-register.
Claim 6
Dependent Claim
348 words
In or for use in a data processing system a circuit arrangement for transmitting information which it derives from two-state signalling points arranged in a plurality of groups and incorporated in peripheral equipments serving a data processor, characterized in that it comprises a) scanning means for sequentially and repetitively scanning said signalling points in a group-after-group order and operative to produce a signalling-point signal appropriate to the state of each signalling point at the time which it is scanned, b) one identical shift-register for each group of signalling points, each said shift-register having at least as many stages as there are signalling points in the group and being arranged to store said signals produced during scanning of all the signalling points of the group, c) comparison means, controlled from the input lead and output lead of the first and last stage respectively of each shift-register, for assessing each said signal when it is produced by said scanning means in relation to that signal of the relevant signalling point which was stored by a shift-register when said point was last scanned, the comparison means being arranged to generate a change-of-state signal in the event of disparity between the currently-produced signal and said previously-stored signal, and d) control means which is responsive to any said change-of-state signal to condition itself, on conclusion of the scanning and storage functions appertaining to the particular group of signalling points, in such manner as to inhibit scanning of another group of signalling points and to cause the scanning means and the particular shift-register to re-institute the scanning and storage functions with respect to the particular group of signalling points, and the control means is further operative when said functions have been comPleted, without intervention of a further change-of-state signal, to cause the signals stored in the particular shift-register to be transmitted as a pulse series over an output lead concurrently with the re-entry of said signals into the shift-register over a path, completed during transmission, between the output lead of the last stage and the input lead of the first stage of the shift-register.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |