DE2035646B2 - Arrangement for coding input signals - Google Patents

Description

additional link conditions between the input lines and the output lines of the switching matrix, which further safeguards or differentiates the link conditions contribute.

The invention is illustrated with reference to the drawing Implementation example explained in more detail. In detail shows

Fig. 1 is a block diagram of an arrangement according to the invention,

F i g. 2 shows a block diagram of part of the arrangement according to FIG. 1, namely the keypad with a converter consisting of a coding matrix and a switching matrix,

genes are transferable. The output signals of the coding matrix 17 can be deciphered by means of a switching matrix 18, to get the necessary control signals

produce.

A circuit diagram of the keypad 11 and the ^ matrix 17 is shown in FIG. From the scheme it can be seen that the keypad U has eleven keys 20 to 30, one of which is connected to each Ground is, while the other connections lead to separate column lines 41 to 51. The coding matrix 17 has row lines 56 to 59 aui, which are fed to a supply voltage via resistors 52 to 55 and also optionally via diodes, which in Fig. 3 by circles at the crossing id it d column lines

until 30

encrypted

Fig.? a circuit diagram of the in Fis. 2 are indicated with the column lines diermatrix, "41 to 51 are connected. It will be understood that the

F i g. 4 is a circuit diagram of the circuit shown in FIG. 2 Poluns shown; the diodes of the Codiermalrix 17 and the Fo switching matrix and development of the voltage source depending on the type of

Fig. 5 is a circuit diagram of a MOS transistor th logic switching elements and other control structures Arrangement, whereby individual components 20 or components can be selected appropriately, or connections are omitted. It is assumed that the keys 20

The in Fig. 1 have a block diagram of functions which are as follows Desktop computer shows a keypad 11, with are: the input data are entered through a preparation unit or a converter 12, 25, an input control 13 and an operating part or a computing unit 14 can be processed. The calculation results are provided by an output unit 15 displayed. The operation of the input control 13, the arithmetic unit 14 and the output unit 15 becomes 30 controlled by clock pulses from a clock generator 16. Depending on the entered by means of the keypad 11 Input data are given to the arithmetic unit 14 via the input control 13 start-up commands, and the mathematical operations are carried out as a function of the input data Results are displayed by means of the output unit 15.

F i g. 2 shows the input part of the system in a block diagram. Again, the keypad 11 is schematic shown from that of the with dashed lines

delimited transducer 12 is applied. An arrival

number of inputs generated by means of the keypad 11 The aogenomic

Output signals are coded by means of a coding matrix so that outputs EC 1 to EC 4 result in such a way that they are sent to a smaller number of lines and 45 the following Boolean links:

Key wrench function EA = Sum equal EB g difference equal EC M ₌ memory plus ED M _α memory minus EE times EF divided by EG Decimal point EH slide to the right El RM memory recall EJ Delete CI output part EK Clear CAi memory

ECl = EBV EDy EFy EC2 = EC V EDy EGy EC3 = EE V EFy E / V EC4 = EAW EBy EC y

EG \ / EH \ JEK

EJ

EJ \ JEK ED \ JEE \ / EF

In detail, the output signal EC 4 results when z. B. the button 20 is pressed. By pressing the button 22 z. B. the output signals EC 2 and EC 4 received.

The in F i g. 2 switching matrix denoted by 18 is illustrated below with reference to the circuit diagram of FIG. 4 explained in more detail. The output signals of the coding matrix 17 are fed to row lines 60 to 63 and inverters 64 to 67, the output lines of the latter being connected to row lines 68 to 71. The row lines 60 to 63 and 68 to 71 are connected to column lines 72 to 78 via diodes, which are shown in FIG. 4 are indicated by circles at the crossing points and form a diode matrix. It is assumed that the output signals of the coding matrix 17 are given by EC 1 to EC 4, so that the output signals EC1 to EC4 appear at the inverters to 67. The output signals of the column lines 72 to

are designated CRL to CR. 7 For example, CR 1 can be a control signal for deleting the output part 15, CR 2 a control signal for deleting the memory, CR 3 a control signal for starting the processing unit 14, CR 4 a control signal for

65 performing addition and subtraction, etc. The control signals are under such conditions assigned to the output signals of the coding matrix according to the following Boolean links:

CRi = ECl Λ EC2> Λ EC ^ individual results, the output signal of button 29 occurs

CRl - ECl Λ EC3 Λ ECA on lines 57 and 58, while the output

CR3 - ECA output signal of button 30 on lines 56 and 58

CRA = ECl Λ ECJ Λ ECA (II) is removable. If you press the button at the same time

CR5 = ECl Λ ECi Λ ECA s most 29 and 30 are therefore on lines 56, 57

CR6 = ECl Λ ECb Λ ECA and 58 output signals detachable. Simultaneously

CRl - ECi / \ E ~ C3 ~ / \ ECA i thus give control signals to the output line

72 and 73 of the sound matrix 18. The

From the links (I) and (II) it follows that the control signals taken are fed to the Recnenein- that a number of control signals by pressing io unit 14, so that both the memory as only one key can be generated when the output register as well as the output register to be deleted,
signals of the eleven keys to four coded signals co- As can be seen from the above, join

are diert, which in turn can be decoded to a number of presses of the key 21 on the lines 56 and 59 control signals. If, for example, the coding matrix receives output signals so that "sum equal" is pressed on the key 20, the signals can be picked up on 15 lines 74 and 75 of the switching matrix 18 and lines 74 and 75 of the switching matrix 18. This is made up of the boolean output signals CR 3 and CRA . Will see the key links

Pushed 22 "memory plus", so come to the LEI _{CR3i = £ C4 and CR4 =} j ^ ^ _λ ΈΠί _{£ C4}

lines 74 and 76 the output signals CR 3 and

CRS etc. 20 to be recognized. From this connection is also the same-

The switching matrix 18, as an integrated sound system, can detect the effect of the inverters 64 to 67 in good time, from the LSI type by means of a MOS transistor arrangement. which can be set up for additional protection or removal, as shown in FIG. lead to a decision of the linkage conditions. So this case correspond to the lines 60 'to 63' which would be the control signal CR 4 does not occur despite the occurrence of the lines 60 to 63 of Fig. 4. signals KCl to 25 output signal EC 4, when one of the KCA which of lines 60 'to 63 'occur, output signals ECl and / or EC3 occurs,
inverted by means of the MOS transistors 64 'to 66'. It is assumed by way of example that CR 3 is the

and lines 68 'to 70' supplied. Another Leilun start command is, while CRA gives the command to Λ-.sgen 72 'to 78' correspond to lines 72 to 78 lead from addition and subtraction. White! 4. In the illustrated embodiment 30 control signals CR3 and CRA by pressing the only the transistors are used that are generated in FIG and the addition or subtraction to transistors remain unused. Executed in practice. The command CR 4 ^ addition and subtraction, ie the execution indicated by hatching in FIG. 5, does not only occur. when the drawn transistors like the diodes according to 35 key 2i is pressed, but also when pressing F i g. 4. When loading serve MOS Transisto "rcn 79 of the key 20. Further control signals are such to 8 !. With GND a ground terminal is used with VDD that when you press the button 21, the Siibirnl: - a connection for negative supply voltage and with tion is carried out, while η ti when pressing the VGG a connection for a negative gate control panel button 20 the addition can be carried out,
designation. 40 By pressing a key you can enter a

With the new arrangement, the number of input signals at the frame is reduced by 18 cm, since they are taken from control signals. Ls - but si also possible via the keypad i \ cingebbaren commands co-, the purpose of executing a will gemeinsadiert. In general, for η "coded" men control by pressing different i'as. Signals minimally log., 71 lines are required. 45 z. B. 20 and 25. a common control signal τ \\ er-Dies bcd'juiei. that the number of input connections, for example the command to execute sen to the carrier or to the circuit board of the int :: - addition and subtraction. It can be seen Wi that ■ grated circuit, and the number of this front there Möelichkeiien with the lo-described keypad 11 leading lines greatly reduced cal bearing members inicgricrtcn Schaltun;. Is OFF. 50 can be guided, with the surface of the carrier body. B. the LSI or MSI sound as well as d; c key 30 "delete memory" at the same time circle, compared to conventional versions, the simultaneous deletion of the greatly reduced and the Bnuclementedichtc takes place without output unit and memory. How the impairment of operational safety results in corresponding Boolean links in the coding matrix 17 in 55 is increased.

For this 1 sheet of drawing

Claims (1)

create, in which with a minimum number of claims: connections, pin connections and the like. 1. Arrangement for coding input control signals generated for the individual keys of the Signals, especially for electronic Compu- S keypad is possible. ter, desktop calculator or the like., In the case of several control- In an arrangement of the type mentioned, this is keys of a keypad via switches input task according to the invention in that lines act on a code matrix, to the output lines directly with input lines, output lines of each control key are connected to a switching matrix, on whose individually assigned coded signal decreasing individual output line control signals is removable, characterized in that the bar, which are directly associated with several control buttons according to the coded signal output lines (56 to 59) are connected to a switching matrix (18) and / or when several are operated simultaneously, are connected to each of them Output line control keys occur and / or at the same time when moving (72 to 78) control signals (CR 1 to CRl) only appear on one control key,
are acceptable, which are coded according to the interconnection of a SchaHmatrix Signal from several control buttons (e.g. 20 to 25) with which the button signals are divided into a certain number are jointly assigned and / or in the case of a code matrix which converts coded signals at the same time tigern actuation of several control keys (e.g. 27, these coded signals are corresponding to a and 28) occur and / or at the same time when determining 20 a certain link between input and pressing only one control key (e.g. 22) occur. Output lines of the SchaHmatrix in a number 2. Arrangement according to claim 1, characterized in converted from control signals, this control characterizing that on a part of the input signals according to the selected connection lines The SchaHmatrix (18) also allows the keys to be assigned in a very specific way (64 to 67) are provided, the output of which are 25 net. So z. B. a control signal several lines (68 to 71) for generating the control keys can be assigned at the same time, so that this signals contribute. Control signal always occurs when a to a key des belonging to a specific group of keys Keypad is pressed. On the other hand you can 30 several control signals occur at the same time when only one specific key is pressed. Finally can The invention relates to an arrangement the linkage can also be chosen so that a bezum coding of input signals, in particular correct control signal occurs only when od for electronic computers, desk calculators Keypad over _{35 are} pressed. In this way, a very revealing switch input lines of a coding matrix can be assigned to the output lines output by the SchaHmatrix. B. by is removable. Parallel routing of a large number of lines or Such a coding arrangement is from the German 40 connections a correspondingly large Schaltungsauf-Auslegeschrift 1 142 453 in connection with a wall is required. For example, the known for a memory device in which the control signals required by key desk calculator for example for printing on a keypad entered information, the functions of storing, deleting the memory, tion signals on a movable Informationsträ- switching on the arithmetic unit and executing beger, such . B. a multi-track magnetic 45 of correct arithmetic types, such as addition or sub-band can be recorded. The keypad includes traction, depending on the coded output, e.g. B. in the manner of a typewriter or signals the code matrix individually or teletype keyboard a variety of keys, which are also partially generated simultaneously, depending on input lines with a coding matrix according to the assignment of the output from the coding matrix that are connected to each Pressing a coded signal to the input line of the coding matrix on the input line of the coding matrix on the seven out keypad connected to the input line key, i.e. each time a line of the coding matrix is applied. With the aid of the starting lines of the code matrix according to the invention, a coded signal consisting of a seven-bit order is thus able to be picked up in parallel with a minimum of circuitry. In the known arrangement, every single gate circuit required for the logical connection as well as with regard to the input line of the code matrix and thus each of the individual keys forming the individual row and column lines is assigned a specific coded signal to the connecting lines which have previously been unknown, whereby the number of input freedom in the assignment of the arrangement lines of the coding matrix is greater than the number of output signals generated as control signals output lines. The corresponding input signals achieved at the output lines 60, which are generated in a keypad via a buffer, which can be removed from each coding matrix in parallel, coded signals that can be removed in parallel by pressing one or more key signals,
speaking heads of the magnetic tape, so that according to one specified in claim 2 on this Information signals generated in a manner on the magnet development of the invention are in the SchaHmatrix band can also be spoken in parallel and thus additionally provided inverters on 65, which are connected to the input dem Tape is storable. lines of the SchaHmatrix are connected and their The object of the invention is to provide a new arrangement output lines for generating the control signals tion to contribute to coding of the type mentioned. With the help of these additional inverters,