GB1449236A - Self-clocking punched tape reader - Google Patents
Self-clocking punched tape readerInfo
- Publication number
- GB1449236A GB1449236A GB5075873A GB5075873A GB1449236A GB 1449236 A GB1449236 A GB 1449236A GB 5075873 A GB5075873 A GB 5075873A GB 5075873 A GB5075873 A GB 5075873A GB 1449236 A GB1449236 A GB 1449236A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- gate
- sensors
- strobe
- flip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/01—Details
- G06K7/016—Synchronisation of sensing process
Landscapes
- Engineering & Computer Science (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Conveying Record Carriers (AREA)
Abstract
1449236 Punched tape reader HONEYWELL INFORMATION SYSTEMS Ltd 31 Oct 1974 [1 Nov 1973] 50758/73 Heading G4M A reader for punched tape has for each data bit in a row two sensors RH1, RH2 sensing corresponding areas on the tape that are longitudinally displaced but overlapping. As shown there are two sets each having six sensors and the sensors from each set feed a respective OR gate G1, G2. Gate G1 via an inverter Il feeds a reset input of flip-flops SA1 which is set by a signal from gate G2 so that the flip flop is set for the period during which a hole is detected by any of the sensors RH1 and is reset when all the sensors RH2 detect no holes. The sensors also feed a comparator EQ1 producing a signal when the signals on the two lines 13, 14 are identical. Since some signals will rise later than others and some will fall earlier than others the pulse from EQ1 is shorter than that from SA1 and is wholly contained by that from SA1. Flip-flop SA1 and comparator EQ1 feed a one shot OS1 producing a short pulse passing the data from sensors RH2 via AND gate G4 and forming a strobe pulse STR. The inverted OS1 signal feeds a reset input of an error flip flop ER1 the set input of which receives the signal from flip-flop SA1. If two strobe signals are produced in a period in which only one should occur, i.e. if EQ1 goes true, false and true one shot OS1 produces two strobe pulses. At the end of the first strobe pulse ER1 is reset to enable AND gate G5 and the second strobe pulse passes gate G5 to produce a DST error signal. AND gate G6 is enabled by the set output of ER1 which is true for only a short period between the start of the SA1 signal and the end of the strobe signal OS1. if the comparator does not detect equality then ER1 is not reset and a signal on line ER1<SP>1</SP> enables an AND gate G6 which passes a signal at the end of the readout period.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5075873A GB1449236A (en) | 1973-11-01 | 1973-11-01 | Self-clocking punched tape reader |
DE19742450943 DE2450943A1 (en) | 1973-11-01 | 1974-10-26 | SELF-CONTROLLING PUNCH STRIP READER |
JP49126500A JPS5749939B2 (en) | 1973-11-01 | 1974-11-01 | |
FR7440867A FR2250157B1 (en) | 1973-11-01 | 1974-12-11 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5075873A GB1449236A (en) | 1973-11-01 | 1973-11-01 | Self-clocking punched tape reader |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1449236A true GB1449236A (en) | 1976-09-15 |
Family
ID=10457240
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5075873A Expired GB1449236A (en) | 1973-11-01 | 1973-11-01 | Self-clocking punched tape reader |
Country Status (4)
Country | Link |
---|---|
JP (1) | JPS5749939B2 (en) |
DE (1) | DE2450943A1 (en) |
FR (1) | FR2250157B1 (en) |
GB (1) | GB1449236A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5238146A (en) * | 1975-09-19 | 1977-03-24 | Matsushita Electric Ind Co Ltd | Power control unit |
JPS57203156U (en) * | 1981-06-23 | 1982-12-24 | ||
JPS582435U (en) * | 1981-06-30 | 1983-01-08 | トヨタ自動車株式会社 | Fiber reinforced plastic leaf spring |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49103537A (en) * | 1973-02-02 | 1974-10-01 |
-
1973
- 1973-11-01 GB GB5075873A patent/GB1449236A/en not_active Expired
-
1974
- 1974-10-26 DE DE19742450943 patent/DE2450943A1/en not_active Withdrawn
- 1974-11-01 JP JP49126500A patent/JPS5749939B2/ja not_active Expired
- 1974-12-11 FR FR7440867A patent/FR2250157B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR2250157A1 (en) | 1975-05-30 |
JPS5749939B2 (en) | 1982-10-25 |
DE2450943A1 (en) | 1975-05-15 |
FR2250157B1 (en) | 1979-07-20 |
JPS50114127A (en) | 1975-09-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1144222A (en) | High density recording system | |
GB1354847A (en) | Character recognition method and system | |
IT986103B (en) | IMPROVEMENT IN CONTROL PROVISIONS FOR DATA PROCESSING SYSTEMS | |
GB1212213A (en) | Improvements in or relating to clock synchronising circuits | |
ES361821A1 (en) | Detection and error checking system for binary data | |
GB1481973A (en) | Document reader | |
GB1449236A (en) | Self-clocking punched tape reader | |
GB1203437A (en) | Data recovery system | |
GB1249536A (en) | An adapter | |
GB1427215A (en) | Magnetic recording systems | |
GB1078783A (en) | Improvements in or relating to character reading | |
CA1078969A (en) | Method and apparatus for transfer of asynchronously altering data words | |
US5012493A (en) | Phase difference-adjusting circuit | |
GB1407163A (en) | Method and apparatus for coding and decoding digital information | |
US3164774A (en) | Readout control circuit for digital data generating short-duration pulses predetermined time interval after relatively long-duration pulses | |
US3715712A (en) | Intrusion detection system employing triple coincidence space-time logic | |
JPS5943860B2 (en) | Frame synchronization signal detection circuit | |
SU471594A1 (en) | Information reading device | |
SU1698815A1 (en) | Device for tolerance check of signal period variation rate | |
GB1215660A (en) | Improved apparatus for sensing a moving record medium | |
SU1295396A1 (en) | Logic analyzer | |
SU391751A1 (en) | DEVICE FOR THE CONTROL OF CLOCK SYNCHRONIZATION | |
SU982093A1 (en) | Storage | |
SU1081654A1 (en) | Device for reproducing digital information from magnetic medium | |
SU1587551A1 (en) | Photoelectric reading device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |