SU687615A2 - Edge distortion measuring unit - Google Patents

Description

one

The invention relates to a technique for the transmission of discrete information and can be used, in particular, in an electrical measuring telegraph network.

According to the main author. St. No. 636814, an edge distortion meter is known, comprising a matching unit, a phase discriminator, a unit for generating ideal recovery meanings, a generator, a mode setting unit, a memory unit, two triggers, two AND elements, a counting unit, a decoder, and a comparison unit.

However, this edge distortion meter provides only a measure of the degree of distortion and a non-measure of the number of exceeding the distortion threshold.

The aim of the invention is to make it possible to measure the amount of Excess of the distortion threshold during an intention session.

For this purpose, the successively connected threshold setting block, the third element AND, the third trigger, the element 2И-OR, the additional counting block, the decoder and the fourth trigger are entered into the well-known edge distortion gauge, the first input of the counting block is connected to the second input of the third trigger and another the input element 2I-OR, the third input of which is connected to the second output of the phase discriminator, the first input of the fourth trigger is connected to the second input of the additional counting unit, to which the start signal is given, the second input of the fourth trigger trigger with the fourth output of the mode setting unit, KOTOpoix input) is connected to the fourth trigger output and to the other input of the third element I, and the input of the installation unit. The road is connected to the output of the counting unit.

The drawing shows a structural electrical diagram of the proposed meter.

Claims (2)

The marginal distortion meter contains a block 1 matching, a block 2 forming ideal significant recovery moments, a phase discriminator 3, a generator 4, a block 5 for setting modes, the first and second triggers 6 and 7, the first 8 and the second O element I, block 10 counting, block 11 memory, decoder 12, comparison unit 13, threshold setting unit 14, third element 15, third trigger 16 2M-element 17 17, additional counting unit 18, decoder 19, fourth trigger 2i. The meter works as follows. According to the start signal supplied to the inputs of the counting unit 18 and the trigger 20, the latter are set to the state O, the trigger signal 20 is enabling for the element 15 and sets the time interval in block 5. The size of the distortion threshold is set in block 14. The output signals block 14 are signals from 2 and paraphase outputs of counting block 1O, where I is the number of bits of counters of counting block 10. The output signals of block 14 are the code for the distortion threshold, which is decrypted by AND 15. The output signal for AND 15 appears every time the contents of the counting block 10 reach the set distortion threshold, and this signal sets I to trigger 16, which, in the O state, is set by a negative signal drop from the output of the block 2. This difference corresponds to the middle of the measured elementary parcel. If the trigger 16 to the state was set in the advance zone (negative distortion zone), then a 2I-OR 17 element passes a pulse corresponding to a positive differential of the above signal from the output of block 2, If the trigger 16 is set to the state in the zone delay (zone of negative distortions), then through the element 2 AND-AND AND 17 a pulse passes from the second output of phase discriminator 3, corresponding to the front of the received distorted parcel. Pulses from the output of the 2I-OR 17 element are counted in counting block 18, made in the form of successively connected counters, the number of which is determined by the selected time of measuring the degree of edge search. The output signals of the counting unit 18 are accessed on the decoder 19, the output signals of which are fed to the inputs of digital lamps. After the measurement time set in block 5 has elapsed, the signal from one of its inputs sets the trigger 20 to the state, thereby prohibiting the operation of the I 15 element. The proposed discrete signal edge distortion meter provides, in parallel with the measurement of the distortion degree, the measurement of the number of exceeding the set distortion threshold for the established measurement time, which is important for assessing the quality of sections of the telegraph network. This estimate is made according to the number of cases in which the maximum permissible distortion threshold is exceeded over a certain period of time - a measurement session. The invention of the measure of the marginal distortion of the author. St. No. 636814, characterized in that, in order to reduce the measurement time by providing the ability to measure the number of exceeding the distortion threshold during a measurement session, serially connected threshold setting block, third AND element, third trigger, element, additional counting block, descrambler and fourth trigger, are introduced, the first input of the counting unit is connected to the BTOffciM input of the third trigger and another input of the element 2IILI, the third input of which is connected to the second output of the phase discriminator, the first input of the fourth trigger and is connected to the second input of the additional counting unit, to which the start signal is given, the second input of the fourth trigger is connected to the fourth output of the mode setting unit, the input of which is connected to the output of the fourth trigger and another input of the third element I, and the input of the threshold setting unit is connected to the output block account.