SU834913A1 - Switching device - Google Patents

Description

(54) SWITCH

to the output tires 9 and the second inputs of the corresponding elements 2 and 2. The selector 4 pulses of maximum duration generates a signal at the output when pulses of a signal with a duration arrive at its input.

th Chkommutator works as follows

in a way.

Before touching the pairs of touch pads 1 with a finger, there are no signals at the outputs of all n 2 and 2 elements, therefore there is no signal at the output of the element OR 3. Therefore, generator 5 does not generate pulses, and the state of counter 7 is characterized by some binary code that is decoded by decoder 8, and on the corresponding output bus 9 there is a signal, on the other tires. 9 no signal.

With the closure of one of the fingers. the pairs of touch pads 1 to the first input of the corresponding element 2I 2 are given a signal leading to the appearance of a signal at the output of the selected element, 2I. The output signal of the element 2 and 2 is fed to the input of the element OR 3, the output of which is a signal that affects the generator 5 and the selector 4 of pulses of maximum duration. The generator 5 begins to generate impulses; the signals arriving at the second input of element 2I 6. When a signal is output from the output of the selector 4 pulses acting on the first input of element 2I b, the pulses start to pass through the element 2I b and flow to the input of counter 7, Which at the same time changes its state. As soon as counter 7 is set to the state to which the signal at the output bus 9 connected to the second input of this element 2 and 2 corresponds, the signal at the output of this element 2 and 2 disappears, so that generator 5 stops generating pulses and the switch remains in this state .

When a finger closes another pair of touch pads 1, the switch works similarly.

When exposed to interference signal duration tnoNv / 11 n any of

The inputs of elements 2 and 2 on its output also appear a signal that, through the element OR 3, acts on the generator 5 and the selector 4 of pulses of maximum duration. The generator 5 begins in. The time interval 1, odgenGenerirovat pulses, however, they do not enter the input of the counter 7 through the element 2I b, because when the selector 4 arrives at the input pulse maximum duration impulses of interference duration tnovv t if at its output, Consequently, the first input element 2 and 6, there is no signal.

Thus, the introduction into the proposed switch selector 4 pulses of maximum duration and element 2I b, connected in an appropriate way, increases its noise immunity.

Claims (2)

1. Zabelin K.N. and others. The system of sensory selection programs SVP-3. Radio, 1977, 7, p. 32. 2. The patent of France No. 2199626, cl. H 03 K 5/00, published 1974.