SU985960A1 - Device for synchronization of telegraphy signal receiver - Google Patents

Description

one

The invention relates to communication technology and can be used in data transmission systems.

A device for synchronizing a telegraph signal receiver is known, comprising a master pulse generator, a matching unit, a pulse shaper, a divider and a serially connected gate, a first counter, a second counter, a decoder, an additional pulse shaper, and a gating unit; the output of the matching unit is connected via the pulse shaper to the second input of the gating unit 1.

However, such a device has a low accuracy.

The purpose of the invention is to improve the accuracy

This goal is achieved by the fact that in a device for synchronizing a receiver of telegraph signals, comprising a master pulse generator, a matching unit, a driver; pulses, a divider and a serially connected valve, the first counter, the second counter, a deitfrator, an additional pulse shaper and a gating unit; the output of the matching unit is connected to the second input of the gating unit through the pulse shaper, the control unit and the cyclic synchronization fixing unit are inserted, and the output the master pulse generator is connected to the first inputs of the divider and the control unit, the second, third and fourth inputs of which are connected

Claims (1)

15, respectively, with the outputs of the matching unit, de | 1tel and the frame locking fixation unit, to the inputs of which the output of the matching unit is connected, respectively, and the output of the output unit, the second and third inputs of which are connected respectively to the first output of the gating unit and the first output of the gating unit and the first the output of the control unit, the fifth, sixth and seventh inputs of which are connected respectively to the output of the first counter, the output of the pulse former and the second output of the sampling unit, the first output of which It is connected to the second input of the second counter, and the second and third outputs of the control unit are connected respectively to the third input of the second counter and the first input of the valve, to the second input of which the output of the divider is connected. FIG. Figure 1 shows the structural electrical circuit of the device proposed; in fig. 2 and 3 - time diagrams. The device contains a master oscillator 1 pulses, matching unit 2, drivers 3 and and pulses, valve 5 counters 6 and 7, decoder 8, divider 9, gating unit 10, control unit 11, cyclic fixation unit 12, synchronization. The device works as follows. The process of tuning the frequency of the device to the speed of the start-stop transmission is divided into two stages: rough and precise. The principle of coarse tuning is based on determining the duration of the period of a binary pair by counting the number of counting pulses that fit into this period. The use of a binary pair for coarse tuning reduces the influence of the dominant type of interference on tuning accuracy. The period of the counting pulses is selected one hundred times smaller than the duration of the period of the binary pair in the state when the device is tuned to the start / stop speed. When adjusting, depending on the number of pulses placed during the period of a binary pair, three zones are distinguished (Fig. 2 and, k, l): less - From9.5 pulses, ravy - 96 104 pulses, more - more pulses, Telegraph The signal in the form of direct current parcels (Fig. 2a) is fed to matching unit 2 and further to shaper 3. The device can turn on at any time, and any number within its capacitance can be recorded in the 6 M Counter. This number is decoded 98 ° by the decoder 8 (Fig. 2 d, g, h), which sets the driver k to the appropriate state. From the first differential to zero, the driver 3 from the boundaries of the telegraph signal produces a pulse U (Fig. 2 b), which polls the state of the driver 4 and tests the zone defined by it in block 10. In addition, the pulse 11 by pulse f generates a signal that permits the passage of pulses with frequency fQ, (FIG. 2) from the output of the divider 9 to the counter input / 7 through the valve 5, does not transmit these same pulses to the input of the counter 6, passes or does not pass the pulses f (fig 2) from the output of the master oscillator 1 to the inputs of counter 6 with divider 9 "Depending on the number, The recorded in the meter 6, designed for data reduction in the period of the binary pair coarse mode counting pulses f0L, and determining the magnitude of deviation between the speed and the start-stop transmission rate at which the device is set, block 11 determines on their setting mode. pulse The process of adjusting the divider 9 continues until the number of pulses recorded in counter 6 reaches a certain value. After that, block 11 prohibits the passage of ff- pulses from generator 1 to the inputs of counter 6 and the divider Simultaneously with the beginning of the arrival of pulses ff to counter 6 and the controlled divider 9 (at the time the signal appears and) at a signal from block 11 to the input of counter 7 through the valve 5 begins to receive pulses f from the output of the divider 9 before it is completely filled. After this block. 11 generates a signal by which counter 6 is transferred to the summation operation and in it the number recorded in counter 7 is set. The capacity of counter 7 and the value of frequency fj. chosen such (fj. f (Y,), so that the time of filling the counter with 7 counting pulses was obviously more than the addition of the number recorded in the counter 6 with pulses of frequency f up to the zone is equal to and significantly less than the period of the binary pair. After equal to the capacitance of the counter 7, the block 11 outputs a signal allowing the passage of the counting pulses fc4 from the output of the divider 9 to the input of the counter 6 before the arrival of the next signal difference from 1 to O. Thus, the counter 6 records the number of counting pulses corresponding to the duration of the binary pair The frequency of the pulses from the divider 9 is roughly equal to the speed of the start-stop transmission, and the possibility of separating the code combination, i.e., the device joining the cyclic synchronism, is ensured. After the device enters the cyclic synchronism, block 12 generates a cyclic pulse, which marks the end of the coarse and the beginning fine tuning. In fine tuning mode, the duration of the entire code combination is determined by counting the counting pulses that fit into the combination period. According to the first starting differential to zero the cyclic pulse Sa block 12 allows the calculation of the period code. combinations and generates a pulse corresponding to the middle of the last information parcel (Fig. 36), which goes to block 11. Telegraphic parcels arrive there (Fig. 3-a), If the last information parcel is bestok (zero TO block 11 allows the passage of counting pulses with frequency k (fig. 3, c, d) from divider 9 and polls the state of shaper 4 in block 10 (fig, 3 D, g, 3, and, k, l. Then the process of correcting divider 9 is similar to this process in roughly , as when fine tuning the device for speed, the start of the stop before and for the time from the middle of the last information parcel to the stop parcel, an impulse should be recorded in counter 6. Thus, just like in rough mode, since the middle of the last information parcel (if it is unpowered), the additional the counter in the zone 6 is equal to, the division factor divider .9 is adjusted and the half of the pre-stop parcel is counted first in counter 7 and then in counter 6. 606 As a result, the duration of the ne The period of the current combination from start to stop. The fine tuning process is repeated with the arrival of new code combinations until the number 6 + is recorded in counter 6 at the time of the arrival of the stop package. This means: that the process of setting up the device for the start-stop transmission speed is completed. The accuracy of setting up the device for the phase of the start-stop transmission is determined by the accuracy of its adjustment for the speed of the start-stop transmission. With a smooth change in the speed of the start-stop transmission, the device automatically changes to a new speed and phase in the exact mode. With a sharp change in the speed of the start-stop transmission I as a result of which the cyclic synchronization is lost, unit 11 automatically switches to the coarse tuning mode and adjusts the device to a new speed. The proposed device improves the synchronization accuracy. An apparatus for synchronizing a telegraph signal receiver comprising a master pulse generator, a matching unit, a pulse shaper, a divider and a serially connected valve, a first counter, a second counter, a decoder, an additional pulse shaper, and a gating unit, the output of the matching unit being connected through the pulse shaper to the second input of the gating unit, characterized in that, in order to increase the accuracy, the control unit and the cyclic sync fixing unit are introduced The output of the master pulse generator is connected to the first inputs of the divider and the control unit, the second, third and fourth inputs of which are connected respectively to the outputs of the matching unit, the splitter and the frame synchronization fixation unit, to the inputs of which are connected the output of the matching unit and the output of the divider, respectively and the third inputs of which are connected respectively with the first output of the gating unit and 98 with the first control unit, the fifth, sixth and seventh inputs of which are connected by the corresponding with the output of the first counter by the pulse driver output and the second output of the gating unit I, the first output of which is connected to the second input of the second counter, and the second and third outputs of the control unit are connected 08 respectively to the third input of the second counter and the first input of the valve, to the second input of which is connected output divider. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 337956, cl. H Qk L 1/00, 1972 (prototype), 6 W 3 and K //Z.J