SU653760A1 - Device for determining telegraphy speed - Google Patents

Description

The invention relates to communication technology and can be used to estimate parameters of discrete transmission signals.

A device for determining the speed of wiring is known, comprising a pulse generator, the output of which is connected via a switch to the first input of a quantization unit and the first input of a reference generator, the output of which is connected to the first input of the display unit and the first inputs of the first, second and third comparison units, and outputs equal to which are connected respectively to the first, second and third inputs of the element I, the output of which is connected to the second input of the display unit, the second and third inputs of the forms The master of the reference parcels is connected respectively to the first and second outputs of the analyzer of the excess-duration of the reference parcels, the first and. The second inputs of which are connected respectively to the outputs "smaller and" larger than the first comparison unit, the output "greater than which is connected via the control counter to the second input of the switch, and the second and third inputs of the parcel quantizer are connected to the first and second outputs of the front-side signal generator of the input parcels, output the parcel quantization unit is connected to the input of the first counter of the length of the input parcels directly, to the input of the second and to the input of the third counter of the duration of the input parcels, respectively divider by two and divider by three 1.

However, such a device has low tuning accuracy and has a large

setup time.

The purpose of the invention is to improve the accuracy and reduce the time to determine the speed of wiring.

For this, the device for determining the speed of wiring, containing a pulse generator, the output of which through a switch is connected to the first input of the parcel quantization unit and the first input of the reference parser, the output of which is connected to the first input of the unit

display and the first inputs of the first, second and third comparison units, the outputs of which are equally connected to the first, second and third inputs of the And element, the output of which is connected to the second input of the display unit, the second and

the third inputs of the reference sample generator are connected respectively to the first and second outputs of the analyzer exceeding the duration of the reference packages, the first and second inputs of which are connected respectively to the outputs "less and more than the first comparison unit", the output "more than which is connected through the control counter to the second input of the switch, but. The second and third inputs of the quantizing package are connected respectively to the first and second outputs of the front-edge input signals generator unit, the output of the package quantizing unit is connected to the input of the first counter of the input package duration, to the input of the second one and to the input of the third counter of the input package size, respectively, through a divider and a divisor into three, the input polarity selection block is introduced, the unit for the preliminary evaluation of the duration of the input elementary parcel, the first, second and third the averaging blocks of the duration of the input parcels and the shaper of the maximum tolerance of the duration of the input elementary parcel; to the first inputs of the first, second and third blocks of averaging the duration of the input packages, the outputs of which are connected to the second inputs, respectively, are first first, second, and third comparison units; the outputs of the first, second, and third counters of the duration of the input packets are connected to the second inputs of the first, second, and third blocks of the averaging duration of the input packets, respectively, and to the first, second, and third inputs of the shaper of the maximum tolerance of the duration of the input chip, the output of which is connected to the third inputs of the first, second and third blocks of averaging the duration of the input packages, the fourth inputs of which are connected to the third input m quantization unit packages, which podk.tyuchen output to the fourth input of the maximum tolerance duration and the chip input to the second input of the provisional estimation unit length of the input chip, the output of which is connected to the third inputs of the first comparator block and the reference analyzer duration exceeding the parcel.

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

The device for determining the speed of cabling contains a pulse generator 1, the output of which is connected via switch 2 to the first input of the packet quantization unit 3 and the first input of the driver 4 reference packets, the output of which is connected to the first input of the display unit 5 and the first inputs of the first, second and third blocks 6 -8 comparisons - the outputs “which are equally connected to the first, second and third inputs of the element AND 9, the output of which is connected to the second input of the display unit 5, the second and third inputs of the The 4 standard parcels are connected respectively to the first and second outputs of the analyzer 10, exceeding the duration of the reference parcels, the first AND second inputs of which are connected respectively to the outputs "less and more than the first comparison unit 6, output" more than which is connected to the second input of the switch 11 2, and the second and third inputs of the block 3 quantization unit are connected to the first and second outputs of the driver 12 of the front signal signals of the input frames, the output of the block 3 quantization module is connected to the input of the first etchika duration 13 parcel input directly to the input and to the second input of the third counter 14, 15, respectively, length of the input chip 16 through a divider by two and by three divider 17, and selection unit 18 parcels the polarity of the input unit 19, a preliminary assessment of

0 the duration of the input elementary parcel, the first, second and third blocks 20-22 averaging the duration of the input parcels and the shaper 23 of the maximum tolerance of the duration of the input elementary parcel, while the input of the former of 12 signals of the fronts of the input parcels is connected to the first output of the unit 18 for selecting the polarity of the input parcels The second output of which is connected to the first input of the preliminary estimation unit 19 of the duration of the input elementary parcel and to the first inputs of the first, second and third averaging units 20-22. input packages, the outputs of which are connected to the second inputs of the first, second and third blocks 6–8, respectively, the outputs of the first, second and third counters 13–15 of the duration of the input packets are connected to the second inputs of the first, second and third blocks of averaging input packages and respectively to the first, second and third inputs of the former 23 maximum tolerance of the input elementary parcel, the output of which is connected to the third inputs of the first, second and third units 20-22 averaging the duration of the incoming parcels, the fourth inputs of which are connected to the third input of the quantizing 3 parcel, the output of which is connected to the fourth input of the maximum tolerance unit 23 of the input elementary parcel duration and to the second input of the preliminary estimating 19 input duration of the elementary parcel whose output is connected to the third inputs the first comparison unit 6 and the analyzer 10 exceeding the duration of the reference parcel.

The device works as follows.

Input signals in the form of a set of telegraph parcels 1), 2 {o, Slq, etc. an arbitrary structure is fed to the input of the polarity selection unit 18. At the time of setting the operation mode, the device is reset. Input parcels through the polarity selection unit 18 are fed to the input of the former 12. The front edge (PF) allows the parcels to be converted into bursts by the quantization unit 3, which are fed through the corresponding dividers 16, 17 to the inputs of counters 13-15, and the parcels equal to the minimum permissible duration, control the operation of the imaging unit 23 through the counter 13, equal to 21 ° through the divider 16 into two and the counter 14 equal to 3 to through the divider 17 into three and the counter 15. The pulses from the quantization unit 3 simultaneously arrive at the input of the unit 19 preliminary oh grades. The latter outputs a signal to the inputs of the comparison unit 6 and the analyzer 10, if the sending time is more than 1.2 to. In this case, the signal from the output of the analyzer 10 to the input of the fortier 4 is prohibited. The comparison unit 6 has three outputs "equal," more and "less, and blocks 7-8 comparisons - outputs" equal. At the same time, the "more" signal arrives at the input of counter 11. The signals from the output of the latter produce a rough switching of the frequency supplied through switch 2 to the input of quantization unit 3 and shaper 4, i.e. frequency is divided by two, by three, and so on. depending on the number of signals “more than 1ta, 2ta. If the duration of the minimum chip is less than 0.8 to, then they are perceived as interference and do not affect the operation of the device. The signals from the outputs of the counters 13-15 and from the output of the polarity indication of the parcel of the polarity selection unit 18 are prepared for operation by the corresponding parcel averaging unit 20-22. The averaging of the parcels i) and the delivery to the comparison block 6 occurs only after the averaging of one positive and one negative parcels (0.8-1.2) to duration along the falling edge (3 (p) of the second of the arrivals.) Averaging the parcels 2i (, and the issuance to the comparison unit also occurs after the receipt of positive and negative parcels to the averaging unit 21, but at the time of the comparison of the parcels to.

The averaging of the parcels 31, and the delivery to the comparison unit 8 also occurs after

the receipt of positive and negative parcels at averaging block 22, but at the time of comparing parcels 2t: c.

Parcel averaging is performed by averaging the value of the parcel fixed by shaper 23. Counters 13, 14, 15 are reset to the falling edge of the signal (3 (p). By the first signal received from the output of averaging unit 20 to the input of the comparison unit 6, it is blocked passing the last signal to the input from the output of the preliminary estimation block 19 and further tuning is done by comparing the average durations of the parcels. When the first signal from the output of the comparison block 6 appears in the range of duration elementary parcels (0.8-1.2) to also stop the flow of signals to counter 11 and fine-tune the speed of wiring by subtracting or adding

the number of pulses in the imaging unit 4 according to the signal from the analyzer 10. When a comparison signal appears at the output "equal to block 6 comparison, the frequency setting stops. With the operation of the element And 9, the display unit 5 indicates the speed of wiring. In addition, the further passage of the input signals through the polarity selection unit 18 is stopped.

To repeat the process of determining

0 wiring speed needed

re-set the operation mode.

Since in real transmission telegraphic parcels are always subject to marginal distortion, the introduction of automatic averaging of the duration of the parcels allows

35 to speed up the process of determining the speed of wiring and improve the accuracy of determining it, to simplify the operation of the device.

40

Claims (1)

1. USSR author's certificate number 383218, cl. H 04 L 7/02, 1973.