GB1234580A - - Google Patents
Info
- Publication number
- GB1234580A GB1234580A GB1234580DA GB1234580A GB 1234580 A GB1234580 A GB 1234580A GB 1234580D A GB1234580D A GB 1234580DA GB 1234580 A GB1234580 A GB 1234580A
- Authority
- GB
- United Kingdom
- Prior art keywords
- deflection
- pulses
- matrix
- character
- pulse
- 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
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
- G09G1/06—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows
- G09G1/08—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam directly tracing characters, the information to be displayed controlling the deflection and the intensity as a function of time in two spatial co-ordinates, e.g. according to a cartesian co-ordinate system
- G09G1/10—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam directly tracing characters, the information to be displayed controlling the deflection and the intensity as a function of time in two spatial co-ordinates, e.g. according to a cartesian co-ordinate system the deflection signals being produced by essentially digital means, e.g. incrementally
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Controls And Circuits For Display Device (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Details Of Television Scanning (AREA)
Abstract
1,234,580. Cathode - ray tube displays. XEROX CORP. 26 Sept., 1968 [28 Sept., 1967], No. 45823/68. Heading H4T. In an arrangement for producing Alpha- Numeric characters &c. on the screen of a cathode-ray display tube by effecting appropriate deflections of the beam in a rectangular X, Y co-ordinate system, the deflecting waveforms are derived from the output of respective intergrators to the inputs of which selected ones of a plurality of trains of pulses, each train differing in frequency from the others, are selectively supplied in accordance with the character &c. to be displayed. Fig. 1, shows the general scheme in which a register 2, loaded, e.g. by a computer, supplies coded character designating signals to a decoder 4 the outputs of which energize the " set " wire in a character core matrix 6 corresponding to a selected character (see terminal 74, Fig. 3 and " set " wire(s) Ax, Ay, corresponding to the X and Y deflection requirements and beam blanking requirements for the character A). The matrix is " scanned " by sequential pulses from a clock controlled distributer 10 (which may comprise a ring counter) the outlets of which are connected to terminals 76 of the matrix, the scanning being effected from leftto-right. The output signals produced by the scanning comprise pulses on terminals 55 to 60 inclusive specifying X-deflection, pulses on terminals 61 to 63 inclusive, specifying Y- deflection, pulses on terminal 92 specifying beam blanking requirements, pulses on terminals 68 and 70 specifying, when present, negative values of the X and Y deflection quantities respectively and a pulse on terminal 84 specifying " end-of-characters " and which is employed to re-set the distributer 10. The signal thus produced by the matrix is then utilized to control the deflection waveform generator 12 comprising, as shown in Fig. 4, nine pulse generating circuits 54 (comprising, e.g. monostable multivibrators) having the input terminals 55-63 connected to the correspondingly numbered terminals of the matrix and producing, in response to the occurrence of an X and/or Y deflection pulse by the matrix, output pulses of the same duration t. The deflection waveform generator also includes six pulse-train generators 30 producing pulse trains having frequencies f2,f3,f5,f7,f8 and f10 each of which is fed to a respective shaper and splitter 32 providing two outputs of the same frequency but of opposite polarity. These pulse trains are then fed, selectively, to the X and Y deflection integrators 38 and 40 respectively via AND gates 34 and 36 in accordance with the pattern of second inputs to the gates from the generators 54 the polarity of the pulse trains passed to the integrators being determined by the presence or absence of inhibiting inputs to the gates from flip-flops 50, 52 controlled by the outputs on terminals 68 and 70 of the matrix and re-set via NOR gates 64 and 66 respectively. The outputs of the integrators, which produce ramp waveform output by integration of the input pulse trains, are then supplied to the X and Y deflection coils 46 and 48 respectively to cause the beam of the display tube 14 to trace the required character, portions of the trace not forming part of the character being blanked out by pulses from a generator controlled by the signal or terminal 92 of the matrix and supplied to the control grid of the tube. Fig. 2 shows the X-deflection waveform (2B) and the Y-deflection waveform (2F) which are utilized to produce the character A (2A) the pulse patterns controlling the generation of the waveforms being shown at 2C, 2D, 2E and 2G, 2H, 2I respectively. Representative segments of characters together with appropriate pulse frequencies for their generation are described in connection with Fig. 6 (not shown). Reference has been directed by the Comptroller to Specification 1,122,568.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US67131767A | 1967-09-28 | 1967-09-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1234580A true GB1234580A (en) | 1971-06-03 |
Family
ID=24694003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1234580D Expired GB1234580A (en) | 1967-09-28 | 1968-09-26 |
Country Status (4)
Country | Link |
---|---|
US (1) | US3587083A (en) |
DE (1) | DE1774884B1 (en) |
FR (1) | FR1582728A (en) |
GB (1) | GB1234580A (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4810893B1 (en) * | 1968-12-11 | 1973-04-09 | ||
JPS492779B1 (en) * | 1969-05-02 | 1974-01-22 | ||
US3689917A (en) * | 1970-09-16 | 1972-09-05 | Computer Image Corp | Frequency selector and synthesizer |
US3713134A (en) * | 1970-09-16 | 1973-01-23 | Corning Glass Works | Digital stroke character generator |
US6076652A (en) | 1971-04-16 | 2000-06-20 | Texas Instruments Incorporated | Assembly line system and apparatus controlling transfer of a workpiece |
US3742484A (en) * | 1971-12-28 | 1973-06-26 | Xerox Corp | Character generating apparatus employing bit stream length correction |
US3786482A (en) * | 1972-03-13 | 1974-01-15 | Lexitron Corp | Apparatus for generating and displaying characters by tracing continuous strokes |
US3775760A (en) * | 1972-04-07 | 1973-11-27 | Collins Radio Co | Cathode ray tube stroke writing using digital techniques |
FR2218646B1 (en) * | 1973-02-20 | 1976-09-10 | Thomson Csf | |
US3946365A (en) * | 1973-12-13 | 1976-03-23 | Bantner John A | Graphic symbol generator |
US3952297A (en) * | 1974-08-01 | 1976-04-20 | Raytheon Company | Constant writing rate digital stroke character generator having minimal data storage requirements |
JPS6076392U (en) * | 1983-11-01 | 1985-05-28 | パイオニア株式会社 | level display device |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3329947A (en) * | 1963-03-07 | 1967-07-04 | Burroughs Corp | Electronic character generator |
-
1967
- 1967-09-28 US US671317A patent/US3587083A/en not_active Expired - Lifetime
-
1968
- 1968-09-25 FR FR1582728D patent/FR1582728A/fr not_active Expired
- 1968-09-26 GB GB1234580D patent/GB1234580A/en not_active Expired
- 1968-09-27 DE DE19681774884 patent/DE1774884B1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
US3587083A (en) | 1971-06-22 |
FR1582728A (en) | 1969-10-03 |
DE1774884B1 (en) | 1971-07-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PLNP | Patent lapsed through nonpayment of renewal fees |