SU1501124A1 - Multichannel telemetery system - Google Patents

Abstract

The invention relates to telemechanics and can be used for informative provision and control in automated control systems. The purpose of the invention is to increase the speed of the system. The system contains on the transmitting side a clock generator 1, element 2И-НЕ 2, one-shot 4, 5, counter 3, switch 7, voltage-to-frequency converters 8, electronic-optical modulator 6, fiber-optic channel, on the receiving side - optoelectronic demodulator 9, one-shot 10-12, counter 13, element 2I-HE 14, decoder 15, group of one-shot 16, group of drivers for 17 pulses and group of frequency-to-voltage converters 10. 2 Il.

Description

3 1501 The invention relates to telemechanics and can be used for informative provisioning and control in automated control systems.

The circuit of the invention is to increase the speed of the system.

Figure 1 presents the structural diagram of the proposed device j in figure 2 - timing diagrams.

The receiving side of the system consists of a clock generator 1, an element 2И-НЕ 2, a counter 3, one-shot 4 and 5, an electron-optical modulator 6, a switch 7, voltage converters 8 into one type. In addition, the receiving side of the system includes an optoelectronic demodulator 9, one-shot 10-12, a counter 13, an element 2I-HE 14, a decoder 15, a single-vibrator 16, shapers 17 Pulses, and voltage-frequency converters 18.

The device works as follows.

The generator 1 of pulses, transmitting the field of the complete set, generates the clock frequency arriving at the first input of the element 2И-НЕ 2, which plays the role of a key, the initial state of which is open. The frequency from the output of element 2I-HE 2 is fed to the input (C) of counter 3 and to the trigger input (V) of the one-shot 5. Counter 3 generates two types of signals: address to control switch 7, which are fed to the address inputs of switch 7 for the purpose of time division channels and transfer, which is fed to the input of the one-shot 4 of a specified duration to form impulses of a given duration at its output. This pulse by the leading edge prohibits the passage of the clock frequency through the element 2I-NOT 2 to the input of counter 3 and the first one-shot 5. After a time period Tn (figure 2, diagram 1), the falling edge opens it. Thus, bundles of channel pulses and a pause are formed after each adjusting to the transfer of counter 3, according to which synchronization occurs later (Fig. 2, diagram 1). The input analog signals are connected to the inputs of voltage-frequency converters 8, converting the analog signals at the input

in a two-level, a discrete signal whose frequency is linearly dependent on the instantaneous value of the input analog value (Fig. 2, diagrams 2-17). The outputs of the converters 8 by the switch 7 (FIG. 2, diagram 18) are alternately connected to the driver (T) input of the first one-vibrator 5, where the pulse-width module (IMT) of the channel pulses occurs — a discrete change in the width of the clock pulses (FIG. 2, chart nineteen). Thus, due to the synchronous operation of the switch 7 and the first one-shot 5, synchronous direct-address discrete PWM channel pulses occur, the low-frequency components (Fig. 2, diagrams 2-17). For normal operation of the device, the clock frequency is chosen more in TP

n +

times the maximum frequency

tact

five

0

five

0

five

0

five

voltage converter 8 is frequency. From the output of the one-shot 5 signal is fed to the optoelectronic module 6, where it is transformed into optical radiation and transmitted to the communication line, at the receiving end of the communication line the optical radiation is converted by the receiving module 9 into an electrical signal which is fed to the input of the one-shot 10 (given multiplicity with repeated launch). Duration | ness its pulse is chosen greater than T (Fig. 2, Diagram, Ma 1), as a result, the envelope of the group signal is formed at its output and as a result, a pause is selected, and this process does not depend on the number and position of the modulated pulses in a pack. A pause leading up in this way triggers a one-shot 11, which produces a short impulse to set the zero of the counter 13 supplied to the input (P (f) of the counter 13. This was used to achieve precise synchronization of the receiving half-set. The signal from the output of the modulator 9 is also supplied To the input (C) of the counter .13, from the output of which the address signals are fed to the input of the Decoder 15, which converts the serial data format to parallel. As a result, we have a synchronously working switch 7 and a decoder 15, on the strobe The input (S) of which is fed from the output element

2IHONE 14, in which the comparison of the duration of the received pulses with the duration of the reference from the output of the third one-shot 12, i.e. the inverse PWM transformation - - discrimination of the duration of the received pulses.,

The signals introduced in this way permit the appearance at the corresponding outputs of the decoder 15 of the corresponding channel signals. The signals thus allocated are fed to one-shot 16 of a predetermined duration with a restart, the pulse duration of which selects T with more T (n + -) (Fig. 2,

 t about "to t

diagram 37) generating a discrete low-frequency signal at the output by composing an envelope. The signal is then transmitted through the driver 17, which performs the function of level matching, to the input of a frequency-voltage converter, where a linear conversion of the local low-frequency signal into a voltage — an input analog signal — takes place.

Claims (1)

Claims of the invention: A multichannel telemetry system comprising a clock oscillator on the transmitting side, a switch, an electro-optical modulator of which is connected to the input of a fiber-optic channel; differs from the fact that, in order to increase speed, it includes: a counter on the transmitting side, one to, , 15 501124 6 novibrators, 2I-NOT element and voltage-to-frequency converters, the clock generator output is connected to the first input of the 2I-NOT element, the output of which is connected to the counter input and the first input of the first one-vibrator, the counter group outputs are connected to the switch's address inputs, the counter output connected through the second one-shot to the second input of element 2Ig-NOT, the inputs of the voltage-to-frequency converters are the information inputs of the system, the outputs are connected to the corresponding information inputs of the switch, the output is cat It is connected to the second input of the first one-oscillator, the output of which is connected to the input of an electronic optic modulator; on the receiving side there are first, second and third one-oscillators, a counter, element 2И-NOT, a group of one-vibrators, a group of pulse shapers and a group of 25 converters frequencies into voltage, opcode demodulator code is connected via serially connected first and second single vibrators with the meter installation input and through the third one vibrator with the first input of element 2И-NOT and directly with etnym counter input and the second input element 2I-NO, whose output is connected to a control input of the decoder, information inputs connected with outputs of the counter, the decoder outputs are connected; respectively, via successively connected homonymous single-oscillators of the group and pulse shapers of the group to the inputs of the same frequency converters into voltage groups, the outputs of which are system outputs. thirty 35 40 Thebes. g