SU640433A1 - Apparatus for transmitting and receiving pulse-modulated signals - Google Patents

Description

The invention relates to radio engineering and can be used in the construction of satellites of communication systems.

A device for transmitting and receiving signals with pulse-code modulation is known, comprising, on the transmitting side, an analog-to-digital converter, a code converter, the output of which is connected to the input of the combiner, and a synchronizer, whose outputs are connected to synchronous inputs of the analog-to-digital converter, code converter and the combining unit, and on the receiving side the serially connected separation unit and the synchronizer, the outputs of which are connected to the synchronization inputs of the converter are the analog-to-analog Og and code converter 1.

However, this device is characterized by the non-exposure of the linear signal to linear errors.

The aim of the invention is to improve noise immunity.

For this, the device for transmitting and receiving signals with pulse-code modulation, containing on the transmitter side an analogue-digit converter, a code converter, the output of which is connected to the input of the combining unit, and a synchronizer, the outputs of which are connected to

the analog inputs are a digital digit, the code converter and the combining unit, and on the receiving side the serially connected separation unit and the synchronizer, whose outputs are connected to the synchronizing inputs of the digital converter, are analog and a code converter, on the transmitting side the driver of control pulses and analyzers, outputs are entered which are connected to the inputs of the code converter and the control pulse shaper, the output of which is connected to the auxiliary input of the combining unit , Wherein up to 5 additionally outputs a synchronizer connected to the clock input of analyzers and a control yuschi.ch pulse shaper, and the analyzer inputs connected to outputs of the converter analog -

0 digit, on the receiving side a delay element is inserted, a driver of control signals and keys, the first and second inputs of which are connected respectively to the outputs of the driver of control

5 signals and a code converter, to the input of which the output of the delay element is connected, the input of which is connected to the second section sensor of the separation unit, the third output of which is connected to the input of the driver

There are 0 control signals, and the additional outputs of the synchronizer are connected to the synchronizing inputs of the delay element, the driver of the control signals and the keys, the outputs of which are connected to the inputs of the digit converter - analog.

In the drawing, a structural electrical circuit and device are illustrated.

A device for transmitting and receiving signals with pulse-code modulation contains on the transmitting side an analog converter — digit I, a code 2 converter, the output of which is connected to the input of combining unit 3, and a synchronizer 4, whose outputs are connected to synchronization inputs of the analog converter — digit converter code 2 and combining unit 3, and on the receiving side serially connected separation unit 5 and synchronizer 6, the outputs of which are connected to the synchronization inputs of the converter, are analog 7 and converter 8, on the transmitting side, control pulse generator 9 and analyzers 10-13 are entered, the outputs of which are connected to inputs of the code converter 2 and control pulse generator I whose output is connected to the auxiliary input of the combining unit 3, while the additional outputs of the synchronizer 4 plug-in to the synchronization inputs of the analyzers 10-13 and the control pulse shaper 9, and the inputs of the analyzers 10-13 are connected to the outputs of the analog converter - digit /, the input element is entered on the receiving side 14, the driver of the control signals 15 and the keys 16-19, the first and second inputs of which are connected respectively to the outputs of the driver of the control signals 15 and the code converter 5, to the input of which is connected the output of the delay element 14, whose input is connected to the second output of the splitter 5, the third output of which is connected to the input of the driver of the control signals 15, and the additional outputs of the synchronizer 6 are connected to the clock inputs of the delay element 14, the driver of the control signals 15 and the keys 16-19, the outputs Otori connected to the inverter input figure - similar 7.

The device works as follows.

Analog converter - digit / digitize analog signal. An analogue — digit 1 includes analyzers 10–13 that determine the presence of at least one discharge pulse in time T.

If for some time the analog signal at the input of the converter

analogue - digit / is absent, then pulses are absent in all of its bit circuits, and analyzers 10–13 in all bit circuits will fix the absence of pulses. If for some time T the analog signal has been low, then the first bit (highest in weight) in the code combinations is missing and one of the analyzers 10–13 connected to the first bit circuit will detect the absence of pulses during the time T. Information signal through analyzers 10-13, through parallel circuits through a code 2 converter, to the combination unit. The signals about the presence of pulses in the discharge circuits from the second outputs of the analyzers 10-

13 are supplied to the control pulse driver 9. The latter forms a code combination that is protected from linear errors. The formation of a code combination is performed once per time T. The time T is chosen sufficiently large, and therefore the redundancy of the code in the code combination formed by the driver of driving pulses 9 slightly increases the volume of the transmitted information signal.

From the output of the control generator 1-pulses 9, the code combinations with period T arrive at the input of the combining unit 3, where the time signal of the information signal is combined, the code combinations received from the control pulse generator 9, and the sync parcels coming from the synchronizer 4. After the combination, the sum signal transmitted to the line.

The linear signal is fed to the separation unit 5, where the signal is divided into the information signal, the code combinations supplied to the driver of the control signals 15, and the synchronizing signals arriving to the synchronizer 6.

The information signal from the output of separation unit 5 through the delay element;

14 enters the code converter. The delay element 14 is required to delay the information signal at the time T.

The bit circuits of the code 5 converter include keys 16-19, which are controlled by the driver of the control signals 15. The last of the code combinations excludes linear faults and generates key controls 16-19.

If the analyzer Yu, included in the first bit circuit, detected at least one pulse of the information signal during time T, then the key 16, included in the first bit circuit, opens for time T.

If the analyzer 10, included in the first bit circuit, detects the absence of an information signal during time T, then the key 16 included in the history bit circuit closes for time T.

Handling keys 17-19 is carried out similarly to key management 16.

If the information signal was absent in one or several bit chains during the time T, then on the receiving side, in the corresponding bit chains, the keys 16–19 will close linear errors that have occurred in these bits and are excluded.

Thus, the proposed device makes it possible to significantly increase noise immunity, eliminate linear errors in the absence of an information signal, and exclude linear errors in higher bits when the information signal is low.

Claims (1)

Invention Formula A device for transmitting and receiving signals with pulse-code modulation, containing on the transmitter side an analog-to-digital converter, a code converter, the output of which is connected to the entrance of the entrainment unit, and a synchronizer, whose outputs are connected to the analog-digital converter-code converters, code converter and the combining unit, and on the receiving side the serially connected separation unit and the synchronizer, the outputs of which are connected to the synchronization inputs of the converter, are digital and analogue ovatel of the code, that is, in order to improve noise immunity, the driver of control pulses and analyzers are entered on the transmitting side, the outputs of which are connected to the inputs of the code converter and the driver of control pulses, the output of which connected to the auxiliary input of the combining unit; the additional outputs of the synchronizer are connected to the synchronizing inputs of the analyzers and the driver of control pulses, and the inputs of the analyzers are connected to the outputs of the analogue converter — a digit on hydrochloric side administered delay element 5 shaper control signals and keys, the first and second inputs of which are connected respectively to the outputs of the forms 1 of the control signals and the converter code, to the input of which is connected the output of the delay element whose input is connected to the second output of the separation unit, the third output of which is connected to the input the control signal generator, the additional outputs of the synchronizer are connected to the synchronization inputs of the delay element, the control signal generator, and the keys whose outputs are connected to the input rows tsnfra converter - analogue. The source of information taken into consideration during the examination: 35 I. Gurevich V.E. and others in myogapalpa telephone communication. D., "Holy Hour, 1973, p. 10-14.