SU362501A1 - DEVICE FOR MEASURING EDGE DISTORTIONS - Google Patents

Description

one

The present invention relates to the field of communication and is intended to measure edge distortion of pulses in the telegraph channels without interruptions and distortions of communication. . Devices for measuring edge distortion of pulses are known, comprising, at the input, a pushing pulse generator connected to a decoder, one output of which is connected via a key to an indicator whose output is connected to a generator and decipher.

However, the known devices for measuring edge distortions in the telegraph communication channels require, during their use, interruptions in communication for the measurement time.

In order to ensure measurement of edge distortion of pulses without interruption of communication, the input of the proposed device is connected via an additional key with delay and a pulse width meter to the second input of the key, and the second output of the decoder is connected to the second input of the additional key.

In addition, in the decoder, the outputs of all six bits of the shift register are connected to one AND circuit, the second bit output is connected via the NOT circuit, the outputs of the first four bits are additionally connected to the second AND circuit, and the outputs of the AND circuit are decoder.

The proposed device is based on the selection from the transmitted text of a code combination corresponding to the letter K. This combination is based on the ratio between the current

and current-free parcels meet the CCITT standards. The probability of occurrence of the letter K in the transmitted text is 3.15%.

For the currently used transmission speeds and the duration of code combinations, the average interval between the occurrences of the letter K is several seconds. For example, for a transmission rate of 50 baud and a duration of a code combination of 7.5 TO, where TO is the duration of the burst, the average time between the occurrences of the letter K is 5 seconds.

The drawing shows a block diagram of the proposed device. The proposed device contains output 1

a telegraph channel with a signal in the form of current and current parcels, a generator of 2 advancing pulses (GUI), which is a generator of square pulses, the frequency of which is determined by the speed of information transmission, the decoder 3 letters K, separating the code combination corresponding to the letter K and representing a logic circuit from elements of computing technology, additional

a key 4 with a delay, which supplies a delayed input signal to a duration meter, controlled by a decoder and provides a delay of the input signal up to 2то, a duration meter 5, designed to measure the duration of pulses arriving at its input, a key 6, connecting a duration meter to the indicator, indicator 7, displaying the values of the edge distortion and reset of the decyfrater. The instrument readings can correspond either to the duration of the measured pulse, or to the value of the edge distortions. In addition, the device includes flip-flop 8-13 triggers, where the triggers, in conjunction with the AND circuit 14, separate the first is four current parcels and form a signal controlling the operation of the key 4 with a delay, and the triggers 8-13 in conjunction with the " Both 15 and the NOT 16 scheme are used to separate the code combination corresponding to the letter K and produce a signal controlling the operation of the key 6. The device operates as follows. In the initial position, the output / telegraph channel is connected to a generator 2 of 25 propulsive pulses, a decoder 3 letters K and a key 4 with a delay, the output of which through a meter 5 of duration and key 6 is fed to an indicator device whose output is connected to the GUI and triggers 8- 13 from the forward register, wherein the control inputs of the key 4 with a delay and the key 6 are connected to the outputs of the descrambler. The outputs of the flip-flops 8 - // push register are connected to the inputs of the circuit "And 14, 35, and its output is connected to the control input t J-- g, j of key 4 with a delay. The outputs of the flip-flops 8, 10, 12 and 13 are connected to the inputs of the AND 15 circuit directly, and to the inputs of the trigger 9 through the NOT 16 circuit. During operation, the input signal is fed to the forward pulse generator 2 to synchronize its operation; At the same time, 5 40 input signal is supplied to the decoder 3 and the key 4 with a delay. Triggers 8 - // and schemes "And 14 provide the launch of key 4 with a delay in the arrival of four consecutive current parcels. Triggers 8-13, the AND 15 and NOT 16 circuits separate the code combination corresponding to the letter K and open the key 6, as a result of which the signal from the meter goes to the indicator 7. After the measurement results are displayed from the indicator 7, a reset signal is output to the triggers forward register and propulsive pulse generator. When a code combination other than K arrives at the device, either key 4 with a delay or key 6 does not open. Subject of the invention 1. A device for measuring edge distortion of pulses in telegraph communication channels containing a forward pulse generator at the input connected to a decoder One output of which is connected via a switch to an indicator whose output is connected to a generator and a decoder, characterized in that, to ensure the possibility of measurement (without interruption of the connection), the input of the device through An additional key connected with a delay and an impulse duration meter are connected to the second key input, and the second decoder output is connected to the second input of the second key. 2. The device according to claim 1, characterized in that the decoder outputs all six bits the shift register is connected to one AND circuit, and the second bit output is connected via the NOT circuit, the outputs of the first four bits are additionally connected to the second AND circuit, and the outputs of the AND circuit are decoder outputs.