SU1457153A1 - Pulse shaper - Google Patents

Abstract

The invention relates to a pulse technique and can be used, for example, in touch switches. The purpose of the invention — extending the functionality — is achieved through the processing of synchronous non-stationary pulse series. For this, an OR-HE 8 element, a second RS-flip-flop 9, AND-NOT 10 and II elements, output buses 12–14 are added to the device. The device also contains an RS flip-flop 1, input buses 2, 6 and 7, diode 3; In this case, the time constant of resistor 4 and capacitor 5 is chosen such that not only in the pauses between the input pulses, but also when part of the input series pulses due to strong interference, the capacitor 5 does not have time to charge to the switching threshold of trigger 1, V result even in the presence of strong interference, acting 1x on the source signal a, leading to the loss of part of the pulses, tires 6 and 7 are affected by a long high level pulse, 1 slug. i (L

Description

To the first and second input shi-45, there can be missing pulses following 2 and 12, the output of the element OR 8 is connected to the cathode of diode 3.

The pulse shaper operates as follows

In the initial state, there are no 2 and 12 pulses on the first and second input buses. If the power was turned on and one or both of the flip-flops 1 and 9 were set to state G, then the output of the second element IS-HE 11 also sets a high level and starts charging the capacitor 5, When the voltage across the capacitor 5 reaches the threshold switch

The effect of interference on the signal source. The first impulse of the series will be set to 1 second trigger 9 and output signals 13 and 14 will begin to act high-level signals. In this case, the pulses on the bus 14 will also participate in the discharge points of the capacitor 5 through the element OR-HE 8 and diode 3,

In a particular application of pulse number 1, the sources of signals on buses 2 and 12 are touch keypads, in which touch pads are arranged in a matrix manner.

 There may be missing pulses due to interference with the signal source. The first impulse of the series will be set to 1 second trigger 9 and output signals 13 and 14 will begin to act high-level signals. In this case, the pulses on the bus 14 will also participate in the discharge points of the capacitor 5 through the element OR-HE 8 and diode 3,

In a particular application of pulse number 1, the sources of signals on buses 2 and 12 are touch keypads, in which touch pads are arranged in a matrix manner.

14

The principle and consists of two electrically separated areas. It was experimentally established that when the angle of the finger is mounted on the touch pad, a non-simultaneity of the touch transducers, each connected to its part of the touch pad, occurs. When the angle of the finger already standing on the touch pad is changed, the signal from one of the two parts of the pad stops and (although the finger does not retract) the processing device (} is xxoning the repeated touch.

In addition, finger trembling, poor surface condition of the touch pad and coarse skin of the finger increase the duration of the contact transient process, which leads to the disappearance of a portion of the pulses at the output of the touch transducer. To ensure reliable formation of a pulse that operates during the entire touch period, the output signals on the tires 6, 7, 13 and 14 are not removed even when the pulses on one of the buses 2 or 12 are stopped. This is achieved by implementing for two series of pulses the OR function of the output bus and using a common EC circuit,

Element 10 implements the NAND functions for the input series, the low level on bus 13 informing the processing device of the time when the two parts of the touch pad start touching at the same time and is used to synchronize the input of the code of the touch pad.

After the termination of the input series on both buses 2 and 12, conditions are created for charging the capacitor 5 to the switching threshold of the flip-flops 1 and 9, since the diode 3 closes

reset to the initial zero state, remove the signals on the output wedges, and the scatter threshold thresholds of the flip-flops 1 and 9 are irrelevant, since the high level from the output of the IS-11 e-mail is valid until at least one of the triggers is turned off. nineteen,

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Claims (1)

Invention Formula A pulse driver containing the first RS flip-flop, the first input of which is connected to the first input bus, the second input is connected to the diode anode, the first output of the resistor and the first capacitor plate, the second one of which is connected to the common bus, the first and second output buses, the first output bus connected to the pr-NbiM output of the first trigger, which is characterized by the fact that, in order to expand the functionality by processing two asynchronous 25 non-stationary series of pulses, the element OR-NOT, the second RS-trigger, The first and second IS-NOT signals, the second input, the third and fourth output buses connected respectively to the first input of the second RS flip-flop, to the output of the first IS-HEY element to the forward output of the second RS flip-flop, inverse outputs of the first and second the flip-flops are connected respectively to the first and second inputs of the second NAND element, the forward outputs of the first and second RS-flip-flops are connected respectively to the first and second inputs of the first NAND element, the second output bus is connected to the output of the second AND-NAND element and the second output resisto pa, the first and second inputs of the element OR are NOT connected respectively to the first and thirty 35 40 A high level from the output of the element g to the second input bus, the output of the element OR NONE 8, Triggers I and 9, the switch OR NONE, is connected to the cathode of the diode.