SU1195475A1 - Device for reception of multifrequency signals - Google Patents

Abstract

The invention relates to communication technology and can be. used in discrete information transfer systems. The purpose of the invention is to improve noise immunity. The device contains an input matching unit 1, a spectrum converter 2, filter integrators 3, amplitude detectors 4, maximum signal selection blocks 5 (BVMS), AND 6 elements, threshold elements 7, control signal generation unit 8, -former 9 threshold voltages, a decoder 10. BVMS 5 generates potentials only at the K outputs corresponding to the potential of logic 1. At the remaining outputs there will be no signals — the potential of the logical O. In BVMS 5, an operating signal is selected that suppresses sig ( N adjacent frequency band positions with a smaller amplitude. 1 il. UD 2 s | SP

Description

The invention relates to communication technology and can be used in discrete information transmission systems. *

The purpose of the invention is to increase 5 noise immunity.

The drawing shows a structural electrical diagram of the proposed device.

A device for receiving many-10 total signals. It contains an input matching unit 1, a spectrum converter 2, integrator filters 3, amplitude detectors 4, maximum signal selection blocks 5 (BVMS), elements And 6, threshold elements 7, block 8 ' generating a control signal, shaper 9, threshold voltage and decoder 10.

The spectrum converter contains 20 a carrier frequency generator 11 and a modulator 12.

The device operates as follows.

The signals from the communication channel are fed 25 to the input of the input matching unit 1, in which they are normalized by level. From its output, the signals are fed to one of the inputs of the modulator 12, the other input of which receives the ed voltage of the carrier frequency of the carrier frequency generator 11. In modulator 12, the signal spectrum is carried above a predetermined frequency band of the communication channel. From the output of the spectrum converter 2, the converted signal is fed to the individual filter integrators 2 of each frequency position of the signals. Filtered signals are detected by amplitude de-detectors 4 and fed to the corresponding inputs of the BVMS 5.

In some BVMS 5, a working signal is embedded that suppresses the signals of neighboring frequency positions, which have 45 * smaller amplitude. Only at the Kx outputs of the BVMS are the potentials 1 formed, and at the other outputs the potential is 0 (no signals). Converted to BVMS 5 into a potential of 50 al 1, the K-th working signal is fed to the And 6 element, where K-signals are multiplied. The resulting signal from the output of element And 6 enters the gate 55 of the input of the threshold element 7 and allows the processing of the Kth working signal from the output of the amplitude detector 4 by the threshold element 7. In this case, the Kth working signal with the maximum amplitude is selected so that it suppresses the signals of adjacent frequency positions. At the same time, the signals from the output of the amplitude detectors 4 are fed to the inputs of the control signal generating unit 8. The control signal generating unit 8 together with the threshold voltage generator 9, depending on the maximum value of the signals of all frequency positions, depending on the sum of the signals of all channels, produces a threshold voltage that arrives at the second inputs of the threshold elements 7, the first inputs of which receive signals from the corresponding amplitude detector 4. In the threshold elements, 7 in the presence of a signal on the gate of the third input compares the voltage of the workers. signals with a threshold voltage, above which a reception signal appears at the output of the threshold element 7, which enters the decoder 10. The decoder 10 processes the working signals received from the threshold elements 7 and provides information to the consumer.

Claims (1)

The invention relates to communication technology and can be used in discrete information transfer systems. The purpose of the invention is to improve noise immunity. The drawing shows a structural electrical circuit of the proposed device. The device for receiving multifrequency signals contains an input matching unit 1, a spectrum converter 2, filter integrators 3, amplitude detectors 4, maximum signal selection blocks 5 (BVMS), elements AND 6, threshold elements 7, a control signal shaping unit 8, shaper 9, threshold voltage and decoder The spectrum converter contains a carrier frequency generator 11 and a modulator 12. The device operates as follows. The signals from the communication channel are fed to the input of the input matching unit 1, in which they are normalized by level, from its output, the signals go to one of the inputs of the modulator 1. The other input of which receives the carrier voltage of the carrier frequency generator 11. In modulator 12, the signal spectrum is transferred above a predetermined band of a communication channel. From the output of the transducer 2 of the spectrum, the transformed signal is fed to the individual filter integrators 2 of each frequency position of the signals. The filtered signals are detected by the amplitude-detectors 4 and are fed to the corresponding inputs of the BVMS 5. In one of the BWMS 5, a working signal which suppresses the signals is separated. adjacent frequency positions with the smallest amplitude. Only on the K-BVMS outputs form the potentials 1, and on the remaining outputs the potential O (no signals) The K-th working signal converted into the BVMS 5 goes to the And 6 element, where the K-signals are multiplied. The resulting signal from the output of the element And 6 enters the gate input of the threshold element 7 and enables the processing of the K-th operating signal coming from the output of the amplitude detector 4 by the threshold element 7. At the same time, the K-th operating signal is output with the maximum amplitude in such a way that it suppresses the signals of neighboring positions. At the same time, signals from the output of the amplitude detectors 4 are fed to the inputs of the control signal extrusion unit 8. The control signal generating unit 8 together with the threshold voltage generator 9, depending on the maximum signal value of all frequency positions, depending on the sum of the signals of all channels, causes the threshold signal the voltage that goes to the second inputs of the threshold elements 7, the first inputs of which receive signals from the corresponding amplitude detector 4. In the threshold elements, 7 if there is a signal at the gating third entrance, workers' voltages are compared. signals with a threshold voltage, at which the output of the threshold element 7 is exceeded, a reception signal appears that enters the decoder 10. The decoder 10 processes the operating signals received from the threshold elements 7 and informs the consumer. Apparatus for receiving multi-frequency signals comprising an input matching unit whose output is connected to an input of a spectrum converter whose output is connected to integrator filter inputs whose outputs are connected to the inputs of corresponding amplitude detectors whose outputs are connected to the first inputs of the corresponding thresholds Bgx elements and the inputs of the control signal forming unit, the output of which is connected to the input of the threshold voltage generator, the output of which is connected to the second inputs of threshold elements, the outputs of which are connected to the corresponding inputs of the decoder, characterized in that, in order to increase the noise immunity, AND elements and blocks for selecting the maximum signal are entered, the outputs of which are connected to the corresponding inputs of the elements H, v you11954754 The moves of which are connected to the third detectors are connected to the corresponding inputs of the corresponding threshold current inputs of the maklelemen selection units, with the outputs of the amplitude-maximal signal.