SU860336A1 - Device for measuring distortion rate in data blocks of various length - Google Patents

Description

(54) DEVICE FOR DETERMINING MEASUREMENT OF PARTICULARITY OF DISTORTION OF INFORMATION BLOCKS OF DIFFERENT LENGTH

one

The invention relates to telecommunications and can be used to estimate discrete channels and the expected efficiency of data transmission over such channels.

A device is known for measuring the frequency of distortion of information blocks of various lengths containing n flip-flops, the output of which is through the corresponding of n matching elements, the combined second inputs of which are the inputs of the 7: clock pulses, is connected to the output of the corresponding of the n pulse counters, and frequency divider; whose control input, combined with the single trigger inputs and with the error counter input, is an error signal input ll.

However, the known device has a large time measured by the frequency of distortion of blocks of information.

The purpose of the invention is to reduce the measurement time without reducing accuracy.

For this, a device for measuring the frequency of distortion of blocks of information of various lengths containing n traggers, the output of each of which is connected to the output of the corresponding n pulse counters through the corresponding second inputs of which are the inputs of the shifted clock pulses, and a frequency divider, the control input of which, combined with single inputs and triggers and with the counter input ovshbok, is the input of the error signal, a switching unit is inserted, with the output

10 frequency dividers, the signal input of which is the input of clock pulses, are connected to the corresponding inputs of the switching unit, HK, whose outputs are connected to the null and left inputs of the corresponding triggers.,

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

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The device contains a frequency divider 1 consisting of flip-flops 1, ..., Ik, n flip-flops 2, ..., 2n, n elements 3, ..., Sn matching, counter 4 errors.

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n counters 5.;, - .., 5, pulses, switching unit 6.

The device works as follows.

Divider 1 frequency is intended

Claims (2)

30 for counting clock pulses in the binary system up to 2. Triggers 2 - 2 are intended for short-term storage of information about m bit combinations received with errors. Elements 3,. . . , 3 matches perform the logical operation of multiplying two variables. Switching unit 6 is designed for the necessary connections of various outputs of the flip-flops 1 - 1c splitter 1 to 2 with zero inputs of flip-flops 2 - 2. A 4 error counter is connected to the device for counting the total number of pulses per measurement session and a counter 5–5 pulses for counting the number of combinations of different lengths generated by errors. The number of triggers for the splitter 1 is chosen based on the definition, and the number n of counters 5 and the circuits controlling them may be less than K, since for m 32 the grouping coefficient remains almost constant and P () is a function of occurrence of at least one erroneous bit over a region of length m can be considered the first reading value of the function, and to construct the entire function, it is sufficient to obtain values of five or six points. Before starting measurements using the switching unit 6, the inputs of the flip-flops 2,. . ., 2y, are connected to the selected outputs of the stages of the frequency divider 1 and determine the values of the arguments (1 length segment). In the initial state, the clock pulses TI are fed to the counting input of the first trigger 1 of the divider 1, and a low potential is maintained at all the single outputs of the flip-flops 2 2y. This leads to the absence of clock pulses at the outputs of the comparison elements 3, ..., 3h. With the arrival of the first pulse of error, the single outputs of all the triggers 1 1c divider 1 by 2 receive a high potential. With the help of block boc mutation, a path is formed along all the chains, for example, 2–3–5 for fixing the meter with counter 5; numbers m of clock pulses TI. Upon reaching this number on. the zero output of trigger 1 of divider 1 produces a high potential, which changes the state of trigger 2 and stops the flow of TI pulses to the counter until a new error pulse appears. If earlier Sh-clocks receive alternate impulse of error, then the triggers 1 IK of the divider 1 set back to one state and the drooping of TI pulses to counter 5 starts anew. It is practically enough to build the P (l: ni) function expressing the frequency of occurrence of at least one erroneous displacement over a segment of length m, five of the values of the argument m, among which there should be a value that is fixed by the counter 4. Other points to be selected for numbers of type 2, where G is an integer and This device reduces the time needed to determine the function P (d1: t) when measuring on the communication channel or reading the error stream from the tape, In addition, the error characteristics of the communication channel are calculated immediately after the end of the measurement session without additional processing using a computer. Apparatus of the Invention A device for measuring the distortion frequency of blocks of information of various lengths, containing n triggers, the output of each of which is connected to the output of the corresponding of the n pulse counters and the divisor via the corresponding of the n matching elements, the combined second inputs of which are the inputs of the shifted clock frequency pulses. the frequency whose control input combined with the single trigger inputs and the error counter input is the error signal input, characterized in that scheni measurement time without decreasing accuracy entered the switching unit, wherein the outputs of the frequency divider, signgshny input of which is input to the clock pulses, are connected to respective inputs of the switching unit, the outputs of which are connected with zero inputs of the respective flip-flops. Sources of information taken into account during the examination 1. Brusilovsky K.A. Measurement of pulse distortions in discrete information transmission systems. ML, Science, 1965, p. 92-94 (prototype). Si