SU1162033A1 - Sensory keyboard - Google Patents

Description

The invention relates to a pulse technique and can be used to enter information into digital

devices for various purposes.

Known sensor switch, 5 containing a clock pulse generator, a delay element, a digital switch, the inputs of which are connected to 10 input buses through the corresponding threshold and integrating blocks, a counter, a register and an NAND element [ΐ ^.

However, the device is not sufficiently high reliability. 15

Closest to the mate to the technical essence is a touch keyboard containing a multiplexer. informational inputs of which are connected to the corresponding

. sensor pads, and control inputs to the outputs of the first pulse counter, whose input is connected to the first output of the clock generator, the second output of which is connected to the gate input of the multiplexer, the output of which is connected to the first input of the NAND element, the second input of which is through the element delays are connected to the first output of the clock generator, and the output to the register clock input, the information inputs of which are connected to the outputs of the first pulse counter, the output of which is inn with the first input of the element I, the second input of which through the element is NOT connected to the direct output of the higher digit of the second pulse counter, to the counting input of which is connected to the output of the element AND, and the preset input - with the output of the element NAND, with the outputs of the register and the second the counter is connected to the corresponding output buses [2 ^.

A disadvantage of this device is the low reliability of operation, due to the possible-. issuing false information while simultaneously touching two (or more) sensor elements.

The purpose of the invention is to improve the reliability of operation.

This goal is achieved by the fact that in the touch keyboard containing a multiplexer, the information inputs of which are connected with the respective 33 2

control pads - with the outputs of the first pulse counter, the input of which is connected to the first output of the clock generator, the second output of which is connected to the gate input of the multiplexer, the output of which is connected to the first input of the NAND element, the second input of which is connected through the delay element to the first output of the clock pulse generator, and the output to the clock input of the register, the information inputs of which are connected to the outputs of the first pulse counter, the output of the highest digit of which о is connected to the first input of the element I, the second input of which through the element is NOT connected to the direct output of the senior digit of the second pulse counter, the counting input of which is connected to the output of the element AND, and the preset input - with the output of the element AND-NOT, the first and second pulse shapers are entered , an additional element Ai is an error fixing unit, with the high-order output of the first pulse counter being connected through the first pulse shaper to the first input of the error-fixing unit, the second input of which is connected to the output of the AND-NOT element and the third with the first output of the second pulse shaper, the input of which is connected to the inverted output of the senior digit of the second pulse counter, and the second output to the first input of the additional element I, the second input of which is connected to the first output of the error fixing unit, An additional element And the second output block fixing errors connected to the corresponding output buses.

The error fixing block contains the first три-trigger, the OR element and the second C-trigger, the inverse output of which is connected to the first output of the error fixing block, and the direct output to the second output of the error fixing block and to the first input of the OR element, the second input of which is connected to the output of the first C-flip-flop, and the output to the C-input of the second C-flip-flop, the clock input of which is connected to the second input of the error-fixing unit · and the clock input of the first C-flip-flop, while the preset inputs of the first and second P-triggers are of 1162033

They are connected respectively to the first and third inputs of the error block.

FIG. 1 shows a functional diagram of the device, · figure 2 • timing diagrams explaining its operation.

The touch keyboard contains a generator of 1 clock pulses (GTI) element 2 delay, the first counter 3 pulses, touch pad 4 ¢ ... 4 ^, multiplexer 5, element 6 AND-NOT, register 7, element 8 NOT, element 9 AND, the second pulse counter 10, first pulse shaper 11, additional element 12 I, second pulse shaper 13 and error fixing unit 14, which includes the first три-trigger 15, element 16 OR, and the second-trigger 17, as well as output buses 18- 20.

The information inputs of the multiplexer 5 are connected to sensor pads 4, ... 4, and the control inputs to the outputs of the first counter 3 pulses, the input of which is connected to the first output of the GTI 1, the second output of which is connected to the gate input of the multiplexer 5, the output of which is connected to the first the input element 6 AND-NOT, the second input of which through the element 2 of the delay is connected • to the first output of the GTI 1, and the output to the clock input of the register 7, whose information inputs are connected to the outputs of the first counter of 3 pulses, and the output of the most significant bit o is connected to the first input of the first element 9 I, the second input of which through element 8 is NOT connected to the direct output of the higher digit of the second counter 10 pulses, the counting input of which is connected to the output of the first element 9 I, and the input of the preset - with the code of element 6 I- NOT, the input of the first pulse shaper 11 is connected to the high-order code of the first counter of the 3 pulses, and the code to the first input of the error fixing unit 14, the second input of the error fixing unit 14 is connected to the code of the 6 AND-NOT element, and the third input with the first code of the second pho mirovate-. For '13 pulses, the input of which is connected to the inverse code of the most significant digit of the second counter. 10 pulses, and the second output - with the first input. additional element 12 And

the second input of which is connected to the first vkod of the error fixing unit 14, in which the inverse of the second ϋ-flip-flop 17 is connected to the first vk55 house of the error fixing unit 14, and the direct vicode to the second input of the error fixing unit 14 and the first input of the element 16 OR, the second input of which is connected to the code of the first три-trigger trigger 15, and the code to the ϋ-input of the second ϋ-trigger 17, the clock input of which is connected to the clock input of the first ϋ-trigger 15, the input of the installation 15 the first три-trigger 15 is connected to the first, and the second a ϋ-trigger 17 - the third input of the block 14

> fixing the error, register codes 7, the second element 12 And the second output

²⁰ block 14 commit errors are connected respectively; Officially with output tires 18-20.

The device works as follows.

A sequence of pulses of ²⁵ positive polarity (of arbitrary duration) with GTI 1 is fed to the input of the first counter of 3 pulses (Fig. 2c |) and through element 2 of the leading edge delay of the pulses, compensating for the circuit delay of multiplexer 5; = - to the second input of element 6 And -NON, the first input of which receives a signal from the code (inverse) multiplexer 5.

35 The first counter of 3 pulses, connecting via a digital multiplexer 5 in series each of the multiplexer inputs to the first input of element 6 NAND, prohibits the passage

40 pulse supplied to the second input element 6 AND-NOT. .

When you touch the touch pad

4..4 _n additional capacity and front edge delay are added.

4¾ pulse on multiplexer code

5 when polling the corresponding input increases. The increase in the delay leads to the fact that conditions are created for the passage of part of the pulse,

50 supplied to the second input element

6 AND-NO. As a result, at the time of polling the first counter 3 inputs of multiplexer 5 corresponding to the used area 55 ke 4 ^ ... 4 ^, the impulses appear in the code of the element 6 AND-NOT, the duration of which is proportional to

the value of the (optional)

... containers.

6

5 · 11

From the output of element 6 AND-NOT, these pulses arrive at the clock input of register 7, the information inputs of which receive signals from the first counter 3, corresponding to the polled input of the multiplexer 5. The code corresponding to the selected touch pad 4, ... 4η is recorded in register 7 .

At the same time, the sequence of pulses from the output of the element 6 AND-NOT is fed to the second input of the error fixing unit 14 and to the reset input of the second counter 10, setting it to the zero state. A null signal from the direct high-order output of the second counter 10, acting through the element 8 NOT to the second input of the first element 9 I, allows the arrival of pulses from the output of the first counter 3 to the clock (counting) input of the second counter 10.

In case of short-term disappearance of touch to the site 4 ^ -4 _n (the effect equivalent to the effect of "bounce" of mechanical switches), the second counter 10 is filled, ns then the pulse appearing at the output of the element 6. And DOES again set it to the zero state. The capacity of the second counter 10 is chosen so that during the short-term loss of pulses at the output of element 6 AND-NOT, which takes place at the beginning and at the end of the touch, the second counter 10 is not completely filled (the signal "1" does not appear on the direct output discharge second counter 10).

At the end of the touch, the pulses at the output of element 6 NID are absent, the second counter 10 is filled with impulses arriving at the counting input through the element '9 I. When the second discharge of the second counter 10 signal "1" appears at the direct high-order output, the pulses at its counting input and the device comes back to its original state.

The pulse signal (single) from the inverse high-order output of the second counter 10 (FIG. 2c) is fed to the input of the second shaper 13 pulses, providing short pulses corresponding to the front (first output) and rear (second output) front of the input pulse. From the first output of the shaper 13 pulses (Fig.2 <3), the signal arrives at the third

5 input unit 14 fixing errors, and from the second output (Fig.2e) - to the first input of the additional element 12 And, to the second input of which enters in the presence of an error prohibiting

¹⁰ signal from the first output of block 14 for error fixation.

The error fixing unit 14 determines the error consisting in simultaneously touching two or more touch pads 4 (, -4 _n (an error known as "pressing N keys"). The algorithm of the error fixing unit 14 is a function of the presence of the AND 6 element at the output more than one pulse in one polling cycle of multiplexer 5 over the interval corresponding to one touch of the pad 4 ^ -4 ^. Timing diagrams explaining the work

6 of the error fixing unit 14, shown in FIG. 2,

The pulses that determine the polling cycle of the multiplexer 5, from the code of the first driver 11 pulses

30 (Fig.2b), the input of which receives a signal from the high-order decoding code of the first counter of 3 pulses, is fed to the first input of the error fixing unit 14. These pulses come

35 to the K-input (input preset) of the first ϋ-trigger 15 and set it to the zero state at the beginning of each polling cycle of multiplexer 5.

In a single state, the first три-trip 40 of ger 15 is set when a pulse arrives (φίΓ.2) from the second input of the error-fixing unit 14 (the signal from the pin of the 6 AND-NO element) to the clock input of the три-trigger 15. On the-input

43 t-flip-flop 15, a signal corresponding to "1".

The signal from the code of the first три-trigger 15 (Fig. 2k) is fed to the second input of the element 16 OR and through it

50 per ϋ-gvhodok second ϋ-trigger 17.

The preset input "(set to" 0 ") of the три-flip-flop 17 'is connected to the third input of the error-fixing unit 14 (with the first output of the second pulse shaper 13), thereby" resetting "the error signal with the start of a new information input cycle (FIG. 2 (3).

Ί 1162033 8

When a multiplexer 5 in one cycle οπρον sa multiplexer 5 two or more pulses at the second input of the error fixing unit 14 (at the output of the element IS-NOT 6) the first impulse 5 is turned on by the first impulse 15. At the same time, at the second input ϋ -trigger 17 signal "1" appears. The next pulse at the second input of the error fixing unit 14 (in this 10th multiplexer 5 polling cycle) turns on the second три-flip-flop in one state, which, due to the connection of its output to the-input through element 16 OR, is stored before the next 15th input data entry cycle begins ation.

The signal from the direct output of the S-flip-flop 17 (the second Output of the error fixing unit 14) (Fig. 2e) is used as the output signal

device (bus 20), signaling an error when entering information.

The signal from the inverse output ϋ-trigger 17 is fed to the second input of the second element 12 And, preventing the appearance of the data tracking signal (Fig.2) at the output of the device (bus 19), i.e. preventing erroneous data entry.

The signal that signals an input error (bus 20) can then be sent to the alarm device (sound or light) ^ signaling the operator that an information input error has occurred.

Improving the reliability of the touch keyboard is achieved by using a signal that signals an input error and by inhibiting the tracking pulse ^! data when there is an input error.

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Claims (2)

1. A SENSOR KEYBOARD containing a multiplexer, the information inputs of which are connected to the corresponding sensor pads, and the control inputs to the outputs of the first pulse counter, the input of which is connected to the first code of the pulse generator, the second output of which is connected to the gate input of the multiplexer, the output of which is connected to the first input of the NAND element, the second input of which through the delay element is connected to the first output of the clock generator, and the code to the clock input of the register, The first inputs of which are connected to the outputs of the first counter, pulses, the higher-order code of which is connected to the first input of the element I, the second input of which through the element is NOT connected to the direct output of the senior discharge of the second pulse counter, the counting input of which is connected to the output of the element And, and the preset input with the code of the element AND-NOT, characterized in that, in order to improve the reliability of operation, the first and second pulse shapers, an additional element AND and an error fixing unit, the higher-order code of the first pulse counter is connected to the first input of the error-fixing unit through the first pulse shaper, the second input of which is connected to the initial code of the NAND element, and the third to the first code of the second pulse shaper whose input is connected to the inverted output of the high-order digit of the second pulse counter, and the second code to the first input of the additional element I, the second input of which is connected to the first code of the fixer unit and error, the register outputs, and an additional element and the second error output fixing unit are connected to corresponding output buses. 2. The touch keyboard according to claim 1, characterized in that the error-fixing unit contains the first три-flip-flop, the OR element and the second-flip-flop, the inverse of which is connected to the first of the unit ν error fixing, and direct output with the second code of the error fixing unit and with the first input of the OR element, the second input of which is connected to the code of the first три-trigger, and the output to the ϋ-input of the second три-trigger, the clock input of which is connected to the second input the error fixing unit and the clock input of the first три-flip-flop, while the preset inputs of the first and second три-flip-flops are connected respectively to the first and third inputs of the error-fixing block. > 1,162 (