SU1292026A1 - Device for reception and transmission of delta modulated signal - Google Patents

Abstract

The invention relates to the field of telemetry and can be used in the digital transmission, recording, processing and recovery of measurement information. The aim of the invention is to increase the reliability of information transfer. The device contains a delta modulator 2, analog-to-digital converter 3, 4 clock pulse generator, switchable frequency divider 8, first BAN 7, first trigger 6, pulse sequence mixer 5, communication channel 9, pulse selector 11, clock generator 12 pulses with automatic frequency control, delay element 13, second trigger 14, second element BANKS 15, counter 16, key block 17, reversible counter 18. Distinctive features of the proposed technical solution are the use of initial and final m arcing signals, the use of switchable frequency divider, the first element BANGE, the first trigger 6, the generator 12 clock pulses with automatic frequency control, the second trigger 14. The efficiency of the device is achieved by increasing the reliability of the transmission of the correction sample. 2 Il. C ee about 1C about yu od figure 1

Description

The invention relates to the field of telemetry and can be used for digital transmission of recording, processing and retrieval of measurement information.

The purpose of the invention is to increase the reliability of information transmission by changing the correction interval and recovering binary symbols.

Figure 1 shows the functional diagram of the device i in FIG. 2, the time diagram of its operation.

The device (FIG. 1) contains on the transmitting side 1 a delta modulator 2, an analog-to-digital converter 3, a generator of 4 clock pulses, a mixer 5, a trigger 6, a BANNER element 7, a frequency divider 8, a communication channel 9, on the receiving side 10, the device comprises a pulse selector 11, a frequency-controlled generator 12, a delay element 13, a trigger 14, a BAN element 15, a counter 16, a key block 17 and a reversing counter 18,

The proposed device works as follows

In the initial state, after switching on the transmitting unit 1, the 4 clock pulse generator closes the delta modulator 2 and the converter 3, as well as the BAN element 7, the switchable frequency divider 8 generates the signal S 1, through which the converter 3 is started and the mixer is controlled 5, from the output of which a marker signal Ml (FIG. 2) is generated, which in this case is transmitted as a positive polarity pulse and with an amplitude greater than the amplitude of the binary sequence pulses (incremental value yes), at the same time the pulse S 1 sets / the trigger 6 to the zero state, so that from the output of the trigger 6 a potential is formed that prohibits the passage of the pulses from the output

Generator E 4 clock pulses through the element BANNER to the input of the frequency divider 8. The delta-modulator 2 enters tracking mode simultaneously with the first sweep of converter 3, and at the time of the end of equilibration (measurement ends) the output of converter 3 generates a signal of the end of measurement S 2, through which the mixer 5 is controlled

12920262

the output of which forms the marker signal M2 (FIG. 2, c, c), which in this case is transmitted as a negative polarity pulse.

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and with an amplitude greater than the amplitude of the pulses of the binary sequence j simultaneously, the pulse M2 sets the trigger 6 to one state, so that a potential is formed from the output of the trigger 6 allowing the passage of clock pulses from the generator output 4 clock pulses through the element 7 BANNER to the input of the frequency divider 8. The frequency division factor of the frequency divider 8 determines the time interval from the point in time at which the signal S 2 is generated until the point in time at which it is not. It is necessary to form the signal S 1. The division factor is chosen depending on the required frequency of accumulation error correction in the communication channel. The divider 8 frequency provides a delay in the issuance of the signal S 1 relative to the signal S 2 (figure 2 a, b, C, d). Thus, a mixed sequence of increment symbols (O and 1) and marker signals (Ml and M2) is formed from the output of the mixer 5. This mixed sequence of information symbols (0.1, Ml, M2) enters communication channel 9, where under the influence of interference occurs distortions and errors (osh) at reception (figs 2 a, e). The information transmitted over channel 9 of the communication goes to the selector 11, where the selection and formation of marker signals Ml and M2 and the formation of signals S 1 and S 2, as well as the selection of clock pulses of addition (+) and subtraction (-) corresponding to the pulses of the increment code (1 and 0) coming from the communication channel. In the initial state, when the receiving side 10 is turned on, the counter 16 and the reversible counter 18 are set to the zero (fault) state. With the reception and selection of the first marker signal Ml and with the formation of the first signal S 1, trigger 14 is decisively passing clock pulses from the generator output 12 clock pulses with phase locked loop through element 15 BANNER to the first (counting) input of counter 16, simultaneously with the formation5

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there is an establishment, time

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The reference sample on counter 16 is sampled on reversible counter 18, i.e. The process of the output of the reversing counter 18 to the tracking mode occurs is performed by a remote measurement of the signal U ,. With the reception and selection of the first marker signal M2 and with the formation of the first signal S 2, the keys of the block 17 are opened and the contents of the counter 16 are entered (FIGS. 2a, v, e) and after the signal is entered, the signal S 2 passes through the delay element 13, sets the trigger 14 in the state prohibiting the passage of clock pulses through the element 15 BANKS on the counting input of the counter 16. At the same time, the same pulse sets the counter 16 to the zero (pass) state. Thus, the receiving side 10 is again ready to receive and select the next marker signal Ml,

Under the influence of interference and short-term disturbances of communication, information transmitted over a communication channel is subject to distortion, i.e. the mutual transition of a positive impulse to a negative () and vice versa (), as well as loss of information. These errors (points in time marked by dots in Fig. 2e) cause the information in the reversing slide 18 to be inconsistent with the measured signal and JJ (samples marked with dots in Fig. 2a). Correction of information (samples) contained in the reversible counter 18 is carried out by measuring the time interval between the initial marker signal Ml and the final marker signal M2,

which (number of pulses N) is proportional to the measured value I and d at the moment of correction and entering I of the received reference sample code into the reversible counter 18i. As a fallout occurs, the generator 12 with phase synchronization continues to generate pulses, then in the counter 16 there will be no accumulations of errors caused by the loss of information symbols of increments (0.1) and the value of the measured value U, at the time of selection of the marker signal M2 will be reliable and allows you to reliably correct the errors kneaded in reverse vnom counter 18.Pr

Thereby, the value of the measured value, according to which a reliable correction is made, is determined by the expression

and,

NX

where N is the number of pulses, I enter0

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12 clock pulses from the generator output with phase synchronization through the element 15 BANNER to the counting input of counter 16 in the intervals between the initial Ml and the final M2 marker signals;

UMQHC maximum range of application of the measured value U J

  maximum number of pulses, the number of pulse code at maximum sweep.

With an intense level of interference using the switchable frequency divider 8, the intervals between the final M2 and the next initial marker Ml can be minimized and thereby increase the number of reliable corrections in the presentation interval.

The proposed device allows to provide high dynamic accuracy by correcting possible accumulation errors and improving the reliability of transmitting corrective readings and thus preserves the high dynamic properties of delta modulation and eliminates its main drawback, the error accumulation, which improves the accuracy of measurement information transmission. in the conditions of interference, and in this case, it does not require expansion of the communication channel bandwidth. These factors determine the economic feasibility of its use in comparison with the known device.

Claims (1)

Invention Formula A device for receiving and transmitting a delta-modulated signal, comprising, on the transmitter side, a delta modulator, the output of which is connected to the first input of the mixer, an analog-digital converter, the output of which is connected to the second input of the mixer, a clock generator, the output of which is connected with the first inputs of the delta modulator and analog-to-digital converter, the second inputs of which are combined and are the device input, on the receiving side it contains a pulse selector, the input of which is connected to the output of the mixer of the transmitting side through the communication channel, the first output of the pulse selector is connected to the first input of the key block and through the delay element is connected to the first input of the counter , the second input of which is connected to the output of the BANNER element, the outputs of the counter are connected to the corresponding second inputs of the key block, the outputs of which are connected to the symotic symbols, to it on the transmitting side A trigger, a BANNER element and a frequency divider are entered, the trigger output is connected to the first input of the BANGE element, the output of which is connected to the third inputs of the analog-digital converter and mixer through the frequency divider and the first trigger input, the second input to the co-JToporo is connected to the output analog-digital converter, the output of the generator of clock pulses is connected to the second input of the BANCH element, on the receiving side getsen JL, 1 m are entered into it. J v-., ftfj - f- the corresponding first inputs of the frequency-controlled oscillator and a sive counter, the second inputs of which are trigger, the third output of the pulse selector is connected to the first input of the BAN element, the fourth output of the pulse selector 20 is connected to the first input of the trigger, the output of which is connected to the second input of the BAN element, output The delay element is connected to the second trigger input. connected to the corresponding second and third outputs of the pulse selector, the outputs of the reversible counter are the outputs of the device, characterized in that, in order to increase the reliability of information transmission by changing the correction interval and restoring 20266 binary symbols, a trigger, a BANNER element and a frequency divider are entered into it on the transmitting side; the trigger output is connected to the first input of the BANNER element, the output of which is connected to the third inputs of the analog-digital converter and the mixer and the first trigger input through the frequency divider, the second the input is tO JToporo connected to the output of the analog-to-digital converter, the output of the clock pulse generator is connected to the second input of the BAN element, on the receiving side he entered S sH 5 S2. g / MIIIIIIIHIHHII HIM and II II I I g IIII I III lini P1P III Illll d miiiiiiniiHi III I till III I I til I nil J I (IN 11 III IIII ililHHIIIIIIi Illimilj iniMHillj, VN1ShGSh Order 274/50 Circulation 544 Subscription Random polygons pr-tie, Uzhgorod, st. Project, 4 one and liHllilli Lt Phys .2 Subscription