SU1389008A2 - Device for receiving bipulsed signal - Google Patents

Abstract

The invention relates to communication technology and extends functionality by correcting errors that occur when a signal level is distorted. The receiver contains Ymitta 1 and 2 triggers, diff. block 3, waiting for multivibrators 4 and 5, el-you And 6-13, el-you OR 14-17, selector 18 duration, trigger 19, delay line 20. 1 il.

Description

The invention relates to communication technology, can be used in data transmission systems and is an improvement of the invention according to the author. St. No. 1254591.

The purpose of the invention is to enhance the functionality by correcting errors that occur when the signal level is distorted.

The drawing shows a structural electrical circuit of the proposed device.

The device for receiving a bi-pulse signal contains the first 1 and second 2 Schmitt triggers, differentiating unit 3, the first 4 and second 5 waiting multivibrators, the first to the sixth elements And 6-11, the eighth element And 12, the seventh element And 13, from the first a quarter of elements OR 14–17, a selector 18 of duration, a trigger 19, a delay line 20, an element, NAND 21.

The device works as follows.

Consider the occurrence of an error when the signal level is overestimated in the device. The device receives a bi-pulse signal, which in the process of propagation undergoes distortion. To restore the shape of received pulses, the device uses a Schmitt trigger 1 with a trigger threshold equal to half the set signal amplitude. If the signal is overestimated by more than half the amplitude, a zero symbol will not be generated at the output of Schmitt's trigger 1, and therefore there will be no pulse at the output of the And 7 element. This will lead to the fact that at the output of the trigger 19 instead of the zero symbol there will be a single one, and at the output of the element And B there will be a single impulse indicating an error when receiving information.

It should be noted that the occurrence of such an error is possible only when switching from 1 to O or vice versa in any other situation (0-0 or 1-1) errors at the output of the trigger 19 PC will be. At the completion of the signal level (with consecutive single pulses successively) the Schmitt trigger 1 does not change

O

50

five

0 Q s

its state and at the output of the element 6 does not arise a single impulse; therefore, the trigger 19 will also remain in the single state. Thus, there will be no error at the output of the receiver. Expansion of the functionality of the device is aimed at automatically eliminating the above mentioned errors. The input signal appears at the inputs of the first and second Schmitt triggers 1 and 2, with the second Schmitt trigger 2 being a signal transition circuit at zero. At the output of the duration selector 18, only pulses will appear when a certain time interval equal to the symbol duration 2 t is maintained between each previous and subsequent input pulse. In the event of an error (only during the transition from 1 to O or vice versa) a single signal will appear at the outputs of the selector 18 for duration and element 8, which through element 11 will feed to the inputs of elements 12 and 13. At one of the outputs of trigger 19 there will be an error single signal, which, through element 12 or 13 and the corresponding element 1-shi 16 and 17, changes the state of trigger 19, thereby correcting the error that has occurred. The device works in the same way when the signal level is lowered.

Claims (1)

Invention Formula A device for receiving a bi-pulse signal according to ed. St. No. 1254591, characterized by. that, .G to expand the functionality by correcting errors that occur when the signal level is distorted, the second Schmitt trigger, the duration selector, the sixth element M, the seventh AND element and the third OR element, and the fourth OR element and the eighth element And, moreover, the outputs of the first and second elements And connected to the inputs of the trigger through the corresponding tretzh and fourth elements OR, the input of the second Schmitt trigger is connected to the input of the first Schmitt trigger, the output of the third element And soy Inonii to a second input of the sixth AND gate, whose output is connected to the first input of the eighth AND gate, flip-flop outputs are connected to 313890084 the corresponding second inputs of the seventh and eighth element AND are connected to the second and eighth elements AND, the output of the fourth input of the fourth element OR.