GB2029972A - Electronic display device - Google Patents
Electronic display device Download PDFInfo
- Publication number
- GB2029972A GB2029972A GB7923351A GB7923351A GB2029972A GB 2029972 A GB2029972 A GB 2029972A GB 7923351 A GB7923351 A GB 7923351A GB 7923351 A GB7923351 A GB 7923351A GB 2029972 A GB2029972 A GB 2029972A
- Authority
- GB
- United Kingdom
- Prior art keywords
- display
- signals
- memory
- screen
- addresses
- 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.)
- Granted
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
- G09G1/14—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 tracing a pattern independent of the information to be displayed, this latter determining the parts of the pattern rendered respectively visible and invisible
- G09G1/16—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 tracing a pattern independent of the information to be displayed, this latter determining the parts of the pattern rendered respectively visible and invisible the pattern of rectangular co-ordinates extending over the whole area of the screen, i.e. television type raster
- G09G1/162—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 tracing a pattern independent of the information to be displayed, this latter determining the parts of the pattern rendered respectively visible and invisible the pattern of rectangular co-ordinates extending over the whole area of the screen, i.e. television type raster for displaying digital inputs as analog magnitudes, e.g. curves, bar graphs, coordinate axes, singly or in combination with alpha-numeric characters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
- G01R13/20—Cathode-ray oscilloscopes
- G01R13/22—Circuits therefor
- G01R13/28—Circuits for simultaneous or sequential presentation of more than one variable
Abstract
The variations of a physical magnitude as a function of time are displayed on a screen. The device comprises an input 31 which receives, for example, analog signals arriving from a measuring device of a physical magnitude, a memory 33 for storing the input signals in chronological order, means for retaining in chronological order the stored signals in the memory, and means 35, 36, 39, 40 for displaying the stored signals on a screen 37 of a cathode ray-tube 38 or other displays in the form of a representative diagram of variations of the physical magnitudes. This apparatus may be used in place of the known paper chart recorders used in medical apparatus, in meteorological observations apparatus, in production control monitors, or in laboratory analysing apparatus. The storage and read out controls are arranged such that the display "moves" in a similar way to a chart recorder, the speed being selectable. Also, the number of lines/frame is variable such that the display may be expanded or contracted in its time scale. <IMAGE>
Description
SPECIFICATION
Electronic recording device
The present invention relates to an electronic recording device, particularly to a device for recording and displaying on a screen variations of a physical magnitude as functions of time.
Electro-mechanical apparatus recording on paper is currently used in numerous fields of activities for providing a visual representation of variations in time of a physical magnitude, which is characteristic of a phenomenon which is to be analysed. Thus, numerous apparatus for medical analysis, monitors for production control, and meteorological observation apparatus are provided with recorders of this type. These known records have a number of disadvantages causing serious inconvenience for the user. They are relatively expensive and are subject to breakdowns, due, for example, to faulty unrolling of the paper or to wrong functioning of the inking stylus. They are fragile and require frequent maintenance. They consume large quantities of paper.Furthermore, their application implies a previous knowledge of the observed phenomenon, an indispensable precognition for a correct selection of the speed of the paper to permit recording which is adapted to the variations of the physical magnitude itself. In fact, a recording of data on too small a time scale does not give the operator a view of the totality of the phenomenon to be observed and does not permit him to study its evolution, while a recording on too contracted a time scale. Sampling of the information at too long intervals may cause a loss of the most interesting information if the corresponding events take place between two samplings of the successive data. Finally, the application of these recorders is relatively limited due to their long response times, making them poorly adapted for the study of rapid phenomena.
According to the invention, there is provided an electronic recording device, comprising an input for electric signals corresponding to the variations against time of a physical magnitude to be observed, means for storing in chronological orderthe input signals, means for selecting in chronological order at least certain of the stored signals, and means for displaying on a screen the selected signals in the form of a diagram representing the variations of the physical magnitude.
It is thus possible to provide an electronic recording device which is more flexiable in its utilization than the conventional paper recorders. Such a recording device can, for example, be incorporated into a centralized administrative control system. Its time of response is extremely short, which makes it able to analyze rapid phenomena. It is conceived for adapting quasi-instantly to a wide range of different
phenomena and can permit by means of push
buttons a selection of the scale of time according to the phenomenon that has to be observed.
The present invention will be further described, by way of example, with reference to the accompanying drawings in which:
Figure 1 illustrates a conventional paper recorder;
Figure2 shows schematically an electronic recording device constituting a preferred embodiment of the invention;
Figure 3 is a block diagram of the electronic circuits of the electronic recording device of Figure 2;
Figure 4 is a block diagram illustrating another form of realization of the circuits of the electronic recording device of Figure 2; and
Figure 5 illustrates the screen of the cathode ray-tube display of Figure 2, but using another principle for displaying the graphs of variations of the studied physical magnitudes.
With reference to Figure 1, conventional paper recorders comprise a housing 1, containing a mechanism (not represented) for unrolling paper 2, and a writing stylus 3. This stylus is mobile along a horizontal axis and inscribes upon the strip or band of paper 2 a diagram 4 illustrating the variations as a function of time of a studied physical magnitude.
The mechanism comprises usually a geared pinion, the gears of which mesh with perforations 5 of the paper band and assure its displacement perpendiculalry to the axis of displacement of the stylus 3.
Figure 2 illustrates an electronic recording device constituting a preferred embodiment of the invention, comprising a housing 21 on the frontface of which are, for example, a screen of a cathode ray-tube 22, a drawer 23, containing the whole of the control circuits or an adaptorfora probe measuring the characteristic signals of an evolving physical, biologic, meteorological, etc., phenomenon that are destined to be displayed on the screen 22 and a speed selector with pushbuttons 24. The speed selector 24 permits control according to a predetermined selection of the speed of unrolling the diagram on the screen which would correspond in the simplest case to enabling the paper recorder to modify instantaneously the speed of unrolling the paper band.In fact, according to the selected speed, the interval separating two lines 25 of the permanent lattice of the screen is longer or shorter, so that the diagram displayed on the screen 22 may represent the phenomenon and its evolution during several intervals such as one minute, ten minutes, an hour, ortwenty-four hours. This choice is naturally totally arbitary and can be adapted according to needs.
Similarly, the number of pushbuttons of the selector 24 is arbitary and could be increased for the recording device according to the degree of control which is to be provided.
With reference to Figure 3, the electronic recording device comprises an input port 31 which receives, for example, analog signals arriving from a measuring apparatus (not shown), the signals being presented, for example, in the form of voltage modulations. The analog signals are transformed into numerical signals in an analog-to-digital converter 32 the output of which is connected to a storage device or memory 33 one variant of which is shown in more detail in Figure 4. The memory output is connected to the input of a digital-to-analog converter 34, the output of which is connected to one of the two inputs of a comparator 35. The other input of the comparator is connected to a saw-tooth signal generator 36. The comparator 35 produces at its output pulses corresponding to the amplitude of the analog signal to be displayed on the screen 37 of a cathode ray-tube 38.The outside signals of the comparator 35 can be used to drive a monostable 39 in case it is desired to represent the diagram of the signal magnitudes in the form of a succession of points disposed respectively on each line of scanning of the screen 37, as is shown in more detail in
Figure 5. The monostable is not used when the representation is made in illuminated lines the lengths of which corresponds to the amplitude of the represented signal as shown schematically on the screen, 22 in Figure 2. The signals arriving, either directly from the comparator 35 or retransmitted by the monostable 39, are transmitted to a modulator 40, the function of which is to control the intensity of all the luminous signals displayed on the screen 37 by acting upon the electron gun 41 of the cathode ray-tube 38.
The device includes a clock pulse generator 42, the pulses of which are supplied to a pre-divider 43 which distributes the sub-multiples of the clock pulses to memory-control circuits 44 and to a decoding circuit 45. The decoding circuit 45 has two outputs, one of which is connected to the demodulator 40 to which it transmits vertical frame signals and the other of which is connected to the deflection 46 of the cathode ray-tube 38 by means of a known time-base-line generator 47 that assures the return of the scanning beam suring the predetermined number of scanning lines. In addition, the output signals of the pre-divider 43 are supplied to two dividers 48 and 49, the capacities of which are mutually and respectively equal to the number of addresses of the memory device 33 and to the number of scanning lines of the cathode ray-tube 38.
The counter 48 performs the memory addressing, while the counter 49 is connected via a time decoding device 50 and a time base generator 51 to the deflection 46 of the cathode ray-tube 38. The counter 49 is also connected to the modulator 40 for providing it with a vertical frame signal. The horizontal and vertical frame signals permit the display on the screen of a reference lattice or raster, the interval between two successive lines of which corresponds, for example, to an interval of time predetermined according to the position of a speed selector 52. The speed selector 52 controls a counter 53 which is connected between the point A, between the linedecoding device 50 and the time base generator 51, and the memory control device 44. The counter 53 is also connected by a gate 54 to the reset circuit of the counter 49.This reset circuit comprises a feedback loop comprising a series connected decoding device 55 and the gate 54.
The described device operates as follows: the digital signals, arriving from the analog-to-digital converter 32, for example, in the form of an 8 bit digital, are directly entered into the memory device 33. The memory address counter 48, the capacity of which is, for example, equal to the number 256, corresponding to the number of scanning lines of the cathode ray-tube 28, provides the memory addresses and controls transmission of the digital signals, converted into analog signals by the converter 34, to the demodulator 40 which sends them to the electron gun 41 of the cathode ray-tube 38 to permit their display on the screen 37. The display address counter 49, of the same numerical capacity as the counter 48, provides the display addresses transmitted to the deflection circuits 46 of the cathode ray-tube 38.With the two counters 48 and 49 working in perfect synchronism, the image appearing on the cathode screen 37 would be a stationary image. It may be desired to observe the continuous movement of the images representing entry of the signals. For this purpose, the circuit resetting the counter 49 to zero comprises a decoder 55 which monitors the state of the counter 49 to a predetermined number, for example, the number 255, and triggers the return to zero of the counter 49 when the decoder 55 has counted 255 pulses.This return-to-zero device, which can be adjusted so that return to zero of the counter 49 is done at the end of any predetermined number of pulses, establishes a time lag between the memory addresses and the scanning addresses so that in the described example the oldest luminous signal appearing, for example, at the bottom of the cathode screen 37, is blotted out and a new inscription appears at the top of the screen 37 corresponding chronologically to the newest input signal and all the intermediate images are shifted downward by a row, i.e. from the most recent signal to the oldest one. This device provides a shronological display of signals in a way which is substantially identical to the inscription by the inking stylus on the paper band.
In the described device, the memory device 33 comprises a single memory and the speed selector 52 permits control of the writing and viewing, i.e. the display of the input signals, according to a different time base for every position of the selector.
An alternative version of the recording device employs a memory assembly consisting of a group of memories in which the input signals are introduced according to different time bases. In this case, the speed selector acts solely to select the reading of one or other of the memories and not on the writing, this writing being automatic; each meory records the signals at a predetermined speed of the speed selector. This device has the advantage of permitting, at any instant, selection of the speed of movement of the recordings on the cathode screen and analysis of the evolution of the phenomenon observed during the more or less long interval of time according to the selected speed.
For this purpose, and with reference to Figure 4, the memory assembly comprises, for example, five groups of memories, eight bits by 256 addresses 61, 62, 63, 64 and 65. It comprises, as already described, a clock pulse generator 66 connected to a pre-divide 67, which is connected to dividers 61 62', 63', 64' and 65'; these dividers divide, for example, the pulses received from the pre-divider 67 respectively by 4, 10,6, 10 and 6. In practice, if a certain predetermined number of signals, for example 16, in the described embodiment, are entered into the unit of the memory 61 during a defined time interval, for example, of one second, the amount of information introduced into the memory 62 is ten times smaller, i.e. 16 signal samples will be introduced during an interval of time of ten seconds.With the divisor 63' dividing by 6, for introducing 16 samples into the memory unit 63, an interval of time of 60 seconds would be necessary; an interval of time of 10 minutes would be needed for introducing 16 samples into the unit 64 and an interval of time of an hour for introducing the same amount of information into the memory unit 65.
As previously explained, the pre-divide 67 provides display addresses for the cathode ray-tube 68 and memory addresses to the counters 61 a, 62aw 63art 64a and 65ax so as to shift by one or more units the memory addresses relative to the display addresses to provide, as previously described, the continuous movement of the image in the sense of the most recent signal toward the oldest signal.
As before, the device comprises an input for an analog signal 69, an analog-to-digital converter 70 a digital-to-analog converter 71, a comparator 72 and a modulator 73 connected to the cathode ray-tube 68. The pre-divide 67 is connected to a line decoder 74 connected as described above to a time-baselines device and to the deflection circuits (not shown) of the cathode ray-tube 68. The pre-divide is also connected to the line synchronization 75 comprising as before a saw tooth signal generator with the reference 36 in Figure 3, to the image synchronization 76, and to the vertical and horizontal framing 77 which provide the reference lines on the screen.
The speed selector 78 permits scanning the information stored in any of the units of memory 61 to 65.
The memories 61,62,63,64 and 65 are connected in parallel forthe writing of the information. The write pulses are transmitted by means of gates 61 c, 62c, 63c, 64c, and 65c receiving the writing control pulses from the pre-divide 67.
With reference to Figure 5, the represented screen comprises a reference lattice (grid) 80 and an ensemble of points 81 every one of which is placed on a scanning line of the screen. The distance of each point from the slide 82 of the screen, i.e. at the respective origin of each scanning line, is equal to the amplitude of the signal represented on the screen.
It is well understood that the screen of the cathode ray-tube, used in the described embodiment, can be replaced by equivalent means of display, for example, a screen of light emitting diodes, a screen of liquid crystals, or a gas (glow) discharge screen.
Equally, the input signals need not be analog signals. It is equally possible to introduce digital signals. In this case, the first analog-to-digital converter becomes superfluous.
The described device is based on the use of memories with semiconductors and a display on a screen, for example, of a cathode ray-tube. The input signal either in digital form or in analog form will be displayed on the screen in real time. The data storage is made in binary form in the memories with semiconductors or in shift registers that can be scanned, if necessary, at a higher speed than the time of access of the data to provide a stable and coherent display on the screen. The memory is of the
FIFO (first in first out) type and of a sufficient capacity for displaying the general tendency of variations of a physical magnitude to be analyzed.
According to one embodiment the memory device comprises several memory units which record, at discrete intervals of time, the selected data, and a speed selector that permits observation on the screen of the global tendency of the curve of variations according to a selected time base which prevents the need to analyse several meters of recorded paper as obtained by means of conventional recorders. The device may include peripheral devices such as photocameras, printers, magnetic bands or any other permanent systems determined for data recording of time intervals exceeding the capacity of the device, as well as that of the incorporated memories. It permits equally the connected with an administrative or a central surveillance, for example in hospitals, which facilitate automatic analysis or analysis by means of an operator. Multi-variable electronic recorders can be equally considered. The separation of the variables can be realised according to one or several of the following principles, limiting the use of each way for preventing ambiguities:
- Coding the variables by brightness and/orthe width of each line (trace).
- Coding by lines or signals of different colours
- Coding by broken lines.
Claims (13)
1. An electronic recording device, comprising an input for electric signals corresponding to the variations against time of a physical magnitude to be observed, means for storing in chronological order to input signals, means for selecting in chronological order at least certain of the stored signals, and means for displaying on a screen the selected signals in the form of a diagram representing the variations of the physical magnitude.
2. A device as claimed in claim 1, in which the electric signals are analog signals and there is provided means for converting the analog input signals into digital signals, the storage means comprising at least one memory unit for storing the selected digital signals, the means for displaying the selected signals including means for converting the digital signals into analog signals.
3. A device as claimed in claim 1, in which the storage means cmprise multiple memory units for storing in each unit according to a differing time base a sampling of digital signals corresponding to variations in time of the physical magnitude.
4. A device as claimed in claim 1, in which the display means comprises a scanning cathode raytube.
5. A device as claimed in claim 1 or 4, in which the diagram is composed of a succession of parallel luminous lines arranged each on a corresponding scanning line and each corresponding to a signal selected from the storing means, the length of each trace on the scanning line corresponding to the amplitude of the represented signal and the origin of each line corresponding to the origin of each scanning line, these origins all being disposed at one side of the screen.
6. A device as claimed in claim 1 or 4, in which the diagram is formed of a succession of luminous points each being arranged on a scanning line and each corresponding to a signal selected from the storing means, the distance of each point to the origin of the corresponding scanning line being proportional to the amplitude of the represented signal.
7. A device as claimed in claim 3, in which each memory unit comprises a predetermined number of memory addresses the displaying means comprises a predetermined number of display addresses equal to the number of the memory addresses, and the device further comprises means for shifting the memory addresses and the display addresses rela tire to each other.
8. A device as claimed in claim 7, further comprising memory addressing means and display addressing means, the memory addressing means comprising a digital counter the capacity of which is equal to the number of memory addresses and the display addressing means comprising a digital counter the capacity of which is equal to the number of the display addresses, the means for shifting the memory addresses and display addresses relative to each other comprising a device for shifting by a determined number of positions one of the counters relative to the other so as to suppress on the screen after a pre-determined number of scannings at least the image corresponding to the oldest received signal, to display at least a new image corresponding to the most recent signal and to shift all the intermediate images by at least one row in the sense of the most recent signal toward the image of the oldest signal.
9. A device as claimed in claim 7, further comprising a speed selector connected to the means for shifting relative to each other the memory addresses and the display addresses, the speed selector being actuated for adjusting the interval of time separating two successive shifts among the memory addresses and the display addresses.
10. A device as claimed in claim 1, in which the display means comprises a light emitting diode screen.
11. A device as claimed in claim 1, in which the display means comprises a liquid crystal screen.
12. A device as claimed in claim 1, in which the display means comprises a glow discharge screen.
13. A electronic recording device substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7820446A FR2430635A1 (en) | 1978-07-04 | 1978-07-04 | ELECTRONIC RECORDING DEVICE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2029972A true GB2029972A (en) | 1980-03-26 |
| GB2029972B GB2029972B (en) | 1982-11-24 |
Family
ID=9210515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7923351A Expired GB2029972B (en) | 1978-07-04 | 1979-07-04 | Electronic display device |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2926794A1 (en) |
| FR (1) | FR2430635A1 (en) |
| GB (1) | GB2029972B (en) |
| NL (1) | NL7905116A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2129259A (en) * | 1982-09-14 | 1984-05-10 | Analogic Corp | Modular computing oscilloscope |
| GB2133164A (en) * | 1982-12-10 | 1984-07-18 | Victor Company Of Japan | Audio signal information display device |
| GB2142174A (en) * | 1983-04-26 | 1985-01-09 | Shin Kobe Electric Machinery | An oscilliscope |
| GB2155288A (en) * | 1984-03-05 | 1985-09-18 | Schlumberger Electronics | Data display method and apparatus |
| EP0789244A2 (en) * | 1996-02-12 | 1997-08-13 | Snap-on Technologies, Inc. | Electronic signal measurement apparatus and method for the acquisition and display of short-duration analog signal events |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2502376A1 (en) * | 1981-03-19 | 1982-09-24 | Ebauches Sa | Data logging system for time varying physical magnitudes - uses assembly of microprocessors for processing clock data and control of cassette recorder for multichannel signal storage |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3786476A (en) * | 1972-03-01 | 1974-01-15 | Gte Sylvania Inc | Television type display system for displaying waveforms of time-varying signals |
| US4058826A (en) * | 1976-04-15 | 1977-11-15 | Seymour Schneider | Method and system for generating oscillographic displays of analog signals upon a TV |
-
1978
- 1978-07-04 FR FR7820446A patent/FR2430635A1/en active Granted
-
1979
- 1979-07-02 NL NL7905116A patent/NL7905116A/en not_active Application Discontinuation
- 1979-07-03 DE DE19792926794 patent/DE2926794A1/en not_active Withdrawn
- 1979-07-04 GB GB7923351A patent/GB2029972B/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2129259A (en) * | 1982-09-14 | 1984-05-10 | Analogic Corp | Modular computing oscilloscope |
| GB2133164A (en) * | 1982-12-10 | 1984-07-18 | Victor Company Of Japan | Audio signal information display device |
| GB2142174A (en) * | 1983-04-26 | 1985-01-09 | Shin Kobe Electric Machinery | An oscilliscope |
| GB2155288A (en) * | 1984-03-05 | 1985-09-18 | Schlumberger Electronics | Data display method and apparatus |
| US4736327A (en) * | 1984-03-05 | 1988-04-05 | Schlumberger Electronics (U.K.) Limited | Data display method and apparatus |
| EP0789244A2 (en) * | 1996-02-12 | 1997-08-13 | Snap-on Technologies, Inc. | Electronic signal measurement apparatus and method for the acquisition and display of short-duration analog signal events |
| EP0789244B1 (en) * | 1996-02-12 | 2004-04-21 | Snap-on Technologies, Inc. | Electronic signal measurement apparatus and method for the acquisition and display of short-duration analog signal events |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2926794A1 (en) | 1980-01-24 |
| FR2430635A1 (en) | 1980-02-01 |
| FR2430635B1 (en) | 1982-01-15 |
| GB2029972B (en) | 1982-11-24 |
| NL7905116A (en) | 1980-01-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |