SU1597890A1 - Method of receiving control signals - Google Patents

Abstract

The invention relates to telemechanics and can be used to receive information in digital form. The purpose of the invention is to increase credibility. The method consists in forming a sequence of square-wave pulses from the input signal, the frequency of which is equal to the frequency of the received signal, the formation of a strobe pulse, the duration of which is equal to an integer number of half-periods of the square-wave pulses, and the formation of a reference signal. In accordance with the method, each K-th pulse of the signal module is extracted and the total number of pulses received during the duration of the strobe pulse is determined. This number determines the number of the frequency, which corresponds to one of the possible transmitted signals, and memorize this number. The described operations are repeated multiple times to ensure a given reliability. A device implementing this method comprises a limiting amplifier 9, a pulse shaper 10, a generator 11, a counter 12, a memory block 13, a decoder 14, a shift register 15 and a matching element 16. 2 Il.

Description

SP

with

00

ten

31597890

The invention relates to telemechanics and can be used to receive information in digital form.

The purpose of the invention is to increase the reliability of reception.

Figure 1 shows timing diagrams for an explanation of the method; figure 2 is a device that implements the proposed method.

Diagram 1 (Fig. 1) shows the oscillogram of the control signal transmitted over the communication channel; diagram 2 shows a sequence of rectangular symmetric pulses formed from the oscillations of the received signal; in diagram 3, the strobe pulses are formed from five (for example) consecutive, luperiods of symmetric rectangular pulses; Figure 4 shows the oscillations of a local stable generator during the existence of a strobe pulse; In diagram 5, the result is a selection of other device nodes. The oscillations of the reference stable generator 11 are fed to the counting input of an eight-bit binary counter 12. Pa. The reset input of this counter receives pulses formed in the imaging unit 10. Thus, the interval between two consecutive reset pulses forms a gate-pulse, during which the bits of the counter 12 filled with oscillations of the generator 11, and the number of pulses recorded by the counter to the end of the strobe pulse depends on its duration, i.e. from the frequency of the input signal.

Before transmitting the reset pulse to the counter 12, the driver 10 delivers. write pulse to the corresponding 20 input of the four-bit block 13. The data inputs of this device receive the contents of the four most significant bits of counter 12 and are stored in block 13 until the next pulse arrives

NIN of every eighth (for example) peri- 25 entry. Four lower bits of the counting of oscillations during the existence of a strobe pulse. As a result of the selection in the given example, the strobe-pulse corresponds to the number of selected oscillation periods of the local generator m 3. Operative 6 (Fig. 1) shows that a positive result compares the total number of oscillation periods with one of the possible values, for example, equal to 3. Operational 7 shows that the decision is made after comparing the results of oscillation during the existence of two (for example) strobe pulses t following each other, and t, in case these results coincide. Step 8 depicts a particular control action. A, which corresponds to the measurement result m 3.

The device (Fig. 2) contains a limiting amplifier 9, a pulse shaper 10, a generator 11, a counter 12, a memory block 13, a decoder 14, a shift register 15 and a matching element 16.

The device is designed to receive eight differently distributed signals; they are transmitted separately over a common communication channel. Symmetric rectangular pulses are generated from the received signal by the amplifier-limiter 9. In the driver 10, control pulses are punched out

YU

35

40

45

50

55

The chip 12 is not used and, in the bits associated with the storage unit, only every sixteenth (2-16) oscillation period of the g-generator 11 during the strobe pulse is transmitted (K 16 The data outputs of the block 13 are connected to the binary-decimal depressions - torus 14. At each of the eight output of the encoder, a logical unit signal appears when there is a binary code at the input corresponding to the number of this output; a separate end node is associated with each output of the decoder.

Such a node (Fig. 2) consists of a twelve-level shift register 15 and a four-input matching element 16. The output of the decoder is connected to the signal input of the shift register, and its forward input receives pulses from the imaging unit 10 at the end of each strobe pulse. The shaper plays the role of a synchronization unit, if at some instant a signal has arrived from a communication channel whose frequency corresponds to the output node in question, a logical unit signal appears at the signal input of register 15 and with each advancing pulse it will sequentially fill the register link. When, after the arrival of the fourth propulsive pulse, all four stars will be filled

0

with ,

for other device nodes. The oscillations of the reference stable generator 11 are fed to the counting input of an eight-bit binary counter 12. Pa. The reset input of this counter receives pulses generated in the imaging unit 10. Thus, the interval between two consecutive reset pulses forms a gate-pulse, during which the bits of the counter 12 fill the oscillations of the generator 11, and the number of pulses, is fixed. c,

counter by the end of the strobe pulse, depends on its duration, i.e. from the frequency of the input signal.

Before transmitting the reset pulse to the counter 12, the driver 10 delivers. write pulse to the corresponding 20 input of the four-bit block 13. The data inputs of this device receive the contents of the four most significant bits of counter 12 and are stored in block 13 until the next pulse arrives

25 records. Four minor bits

five

0

five

0

five

Chip 12 is not used, and in the bits associated with the storage unit, only every sixteenth (2-16) oscillation period of the g-generator 11 is transmitted during the strobe pulse time (K 16). The data outputs of block 13 are connected to the departures of the binary-decimal depot 14. At each of the eight outputs about the decoder, a signal of a logical unit appears when there is a binary code at the input corresponding to the number of this output; a separate end node is associated with each output of the decoder.

Such a node (Fig. 2) consists of a twelve-level shift register 15 and a four-input matching element 16. The output of the decoder is connected to the signal input of the shift register, and its forward input receives pulses from the imaging unit 10 at the end of each strobe pulse. The shaper plays the role of a synchronization unit, if at some instant a signal arrived from the communication channel, the frequency of which corresponds to the output node in question, a signal of a logical unit will appear at the signal input of the register 15 and with the arrival of each forward pulse will begin to fill the register link. When, after the arrival of the fourth propulsive pulse, all four links appear to be filled, the coincidence element 16 (logic element 4I) will work and a signal will appear at the output of the receiver.

Thus, the appearance of a signal at the output occurs in the event that the reception results coincide within: four next 1 times one after the other strobe pulses (n 4).

Claims (1)

Invention Formula The method of receiving control signals, condition Егтй in the formation of a sequence of rectangular pulses in the form of a square wave from the received analog signal, the frequency of which is equal to the frequency of the main harmonic of the received signal, the formation of a strobe pulse and the formation of a reference periodic signal, characterized in that reception reliability, strobe pulse duration form a multiple of the integer number of half-periods of the formed sequence of rectangular pulses selected from the condition of the required noise immunity; each Kth period of the reference periodic signal is selected, where K is chosen according to the required bandwidth, JQ is determined by the number of allocated periods of the e and the reference signal in a time equal to the strobe pulse duration, compare this number with the numbers corresponding to the nominal frequencies of the received signals, and if they match, fix the number of the received frequency, repeat the process a specified number of times, selected from the condition of the required noise immunity, after which the  among themselves the numbers of frequencies of the signals received each time, and when numbers coincide, form the output signal corresponding to the number. Received Signals. iS a l a a l vy iu y ill  } J v  A l  } J Vy / m N / / 77