RU1793554C - Device for keying speed measuring - Google Patents

Abstract

Use - electric communication. The inventive pulse generator 1, three keys 2, 12, 18, inverter 3, trigger 4, generator 5 pulses, two elements And 6, 8, three counters 7, 10, 13, two divider 9, 19, adder 11 modulo two, time master element 14, two decoders 15, 16, indicator 17 and switch 20.1-4-6-7-11-12-20-13-15-17, 5-6, 5-20, 5-8-9 -10-11, 1-2, 11-18-2,5-14-12, 14-18, 14-13, 14-15, 14-16. 14-20. 12-19-20, 13--16-17.1-3-4.3-6.3-8.4-8.1-10.2 s. P. f-ly, 2 ill.

Description

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with

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Figure 1

The invention relates to telecommunications and can be used in simulators for training telegraph operators and autonomously in the field.

The purpose of the invention is to simplify the device. . ...-..-. ....... In FIG. 1 shows a structural electrical diagram of the proposed device; in FIG. 2 are timing diagrams illustrating its operation.

The device for measuring the telegraphy speed comprises a pulse shaper 1, a first switch 2, an inverter 3, a trigger 4, a pulse generator 5, a first element And 6, a first counter 7, a second element And 8, a divider 9, a second counter 10, an adder 11 modulo two . the second key 12, the third counter 13, the time setting element 14, the first and second decoders 15 and 16, the indicator 17, the third key 18, an additional divider 19 and switch 20.

The device operates as follows.

The signals of the telegraph signal source are fed to the input of the pulse former 1, which generates positive pulses with a duration determined by the signal source (Fig. 2a). The pulses from the output of the driver arrive simultaneously at the input of the first key

2. which includes the rest of the device, except for the pulse shaper, and to the input of the inverter 3, the first inputs of the trigger 4 and the second counter 10, supplying them to their initial state. Positive pulses of the pulse shaper 1 along the leading edge reset counter 10 each time. Inverter pulses

3. corresponding to the signal pauses (Fig. 2 b), ensure the passage of the counting pulses through the three-input elements And 6 (Fig. 2c) and 8 (Fig. 2d) (in the presence of successively high time nye potentials at their third inputs), respectively, to the first and second counters 7, 10, and to the last, through the divider 9 (Fig. 2e), the contents (the number of pulses corresponding to the duration of pauses) are gradually compared in the adder 11 modulo two. Switching the inputs of the counters and 10 is carried out by the trigger 4 together with the elements And 6 and 8.

Trigger 4 is set to the required state when a first pulse is supplied from the pulse shaper 1 to the input of the unit and when the key is supplied with power

2- ..::: -....-. -.:,. .

Until the moment the signal is applied and the elements 6 and 8 are turned on at the first inputs of the pulses generator 5, pulses are not supplied, since it is turned off. According to the first pulse of the signal, recording in the counters of 7 and 10 numbers does not occur (regardless of the potentials at the third inputs of the elements And b,

8), since a low potential (0) is supplied to their second inputs from the inverter 3. With the arrival of the first pause of the signal, trigger 4 is overturned so that at its direct output there is a high potential (1), and at its inverse - 0.

0 In this case, within the pause, through the And 6 element in the counter 7, a number is recorded that corresponds, as a rule, to the standard pause. With the arrival of the next pulse of the signal, trigger 4 again capsizes

5 so that the direct output is 0 and the inverse is 1. In this state, trigger 4 remains until a reset command is issued along the common circuit, resetting the circuit. This fixes a reference pause. : ..;.;

0 Thus, all subsequent pauses will pass through the second element And 8, the divider 9 and fixed in the second counter 10. Its contents for each slice of the signal are compared in the adder 11

5 with a reference pause, and the counter 10 is reset to the next edge, preparing the next comparison. If the numbers corresponding to the duration of the reference pause and the received one are equal to or

0 if the second number is greater than the first, then a comparison will occur and at the output of the adder 11 a comparison pulse will appear (Fig. 2e), which through the second key 12 is supplied to the third counter 13. The adder 11 fixes

5 by issuing a comparison impulse, only equality or excess of the numbers shown in Figs. 2c and 2d, the duration of partitions between groups is not measured. The choice of a division ratio of 1: 4 divider 9 ensures that only partitions between groups of characters (Fig. 2 e) of the standard Morse code are recorded in the counter 13, but taking into account the telegraphist’s essay, i.e., possible instability of its operation in transmitting pauses. -. ,. -,

At the end of the measured interval (Fig. 2 g), the transmission speed is highlighted in groups of characters, and then the counters (along the edge) of the next measured

0 interval. In this case, the contents in the first counter 7 are stored until a general reset. The contents of the third counter 13 at the control inputs of the decoders 15 and 16 according to the Measuring Pulse Slice are respectively encrypted in the first and second decoders 15 and 16, and the transmission speed is displayed on the indicator 1.7. The pause duration between the measured pulses is selected sufficient to indicate the maximum transmission rate. The entire device is restored to its original state from the reset circuit by pressing the corresponding button on the input of key 2. This circuit is not shown conventionally in the diagram.

If the work is carried out by a non-standard Morse code, then in this case the divisor factor of divisor 9 is taken equal to 1: 2, in the measuring interval it is reduced.

The likelihood of capture as a reference pause is not elementary, significantly less (4-5 times), since their average repetition rate is 4-5 times less. In addition, during the learning process, it is required by the rules to enter into the connection by transmitting the letter g three times. It also reduces the likelihood of capturing a long pause. In the case of capturing a large pause, zero telegraphy speed will be shown as indicators on the indicators. The teacher or additional inclusion of the third key 18 will make a second measurement by switching the first key 2 to its original position by pressing the reset button or automatically by applying a pulse through an additional normally closed key 18. The latter is possible if at least one comparison pulse is not supplied to its inhibitory input from the adder 11. In this case, the pulse cut-off time of the setting element 14 passes unhindered into the switching circuit of the first key 2,

By the next pulse of the signal, key 2 is turned on again.

:

Since the probability of capture as a standard large pause is small, such a phenomenon will be rare and can only lead to a delay, but does not change the measurement accuracy.

Claims (3)

1. The determination of the transmission time of 5 groups is carried out by averaging by dividing the duration of five dimensional intervals by the value of the transmission rate (operation) by the operator, indicated by indicator 17, 2. If you need specific measurement of the transmission time of five groups of characters, you can provide an additional divider 19 by five and a two-position switch 20 in three directions: I - the first direction through which when the switch 20 switches to the left, the counter 13 is controlled, the decoders 15 and 16 pulses corresponding to the section between the five groups: And - the second direction through which the comparison pulses of the adder 11, i.e. groups of characters (Fig. 2e) are supplied to the additional divider 19; 111 - the third direction through which the input of the third counter 13 receives counting (temporary pulses) from the generator 5. In this case, the indicator 17 displays the number of counting pulses passing in the interval between the pulses of the transmitted five groups. Since the counting pulses can be selected in multiples of time units, for example seconds, it is possible to determine the transmission time of five groups in this way. The display principle remains unchanged. the input of the third counter, characterized in that, in order to simplify the device, the first and second keys, the trigger, the second element And, and the divider are introduced, while the output of the pulse shaper is connected to the input of the first key, to the input of the trigger setting and to the input of zeroing the second counter , the counting input of which is connected to the output of the divider, the input of which is connected to the output of the second element And, the first, second and third inputs of which are connected respectively to the output of the pulse generator, with the output of the inverter and with the inverse output of the trigger, in od which is connected to the reset output of the inverter and to the first input of the first AND gate, second and third inputs, and whose output is connected respectively, with the output of the pulse generator, d by the direct output of the trigger and with the input of the first counter, and the output of the adder modulo two through the second key, the second input of which is connected to the time output of the master element, is connected to the counting input of the third counter. 2. The device according to claim 1, characterized in that, in order to automate repeated measurements, the output time of the driver is connected to the additional input of the second key through the entered third key, the second input of which is connected to the output of the adder modulo two. 3. The device according to paragraphs. 1 and 2, characterized in that, in order to measure time X. „1 fli no transmission of five groups of characters, an additional divider and switch are introduced, while the output time of the driver is connected to the control input of the third counter through the first input and output of the first channel of the switch, through the input and first output of the second channel of which the output of the second key is connected to the counting input the third counter, the output of the pulse generator is connected to the input of the third channel of the switch, the second output of which is connected to the first output of the second channel of the switch, the second output of which and the second input of the first The channel of the switch is connected respectively to the input and output of the additional divider. shh