SU1197097A1 - Device for adaptive compensation of external interferences - Google Patents

Abstract

The invention relates to communication technology and is intended to compensate for the in-line paths of multi-channel communication systems by external interference induced by broadcast radio stations. The device contains a block of interference (GDP) 1, phase shifter 2, 1st and 2nd correlators (K) 3, 4, 1st and 2nd adjustable amplifiers 5, 6, adder 7, selective amplifier (SU) 8, the extra correlator dash (DC) 9, the additional adder (DC) 10 and the subtraction element (EV) II. The output of the DC 10 produces a signal proportional to the total energy of the same spectral components of the reference signal and the signal of the linear path. EV 11 compares it with a signal proportional to the energy of the signal of the reference channel taken from the output of DC 9, both inputs of which are connected to GDP 1. A voltage proportional to the difference (L of these signals is applied to the controlling inputs of GDP 1 and SU 8 which change the gain factor, equalizing the energy at both inputs of the 1st and 2nd KZ, 4. 1 or QO o

Description

The invention relates to communication technology and is intended to compensate in the linear paths of multi-channel communication systems for external interference induced by broadcasting radio stations.

The purpose of the invention is to improve the accuracy of external noise compensation,

The drawing shows a structural electrical circuit of the device.

A device for adaptive compensation of external interference comprises an interference release unit 1, a phase shifter 2, the first and second correlators

3 and 4, the first and second adjustable amplifiers 5 and 6, the adder 7, the selective amplifier 8, the additional correlator 9, the additional adder 10 and the subtraction element 11.

The device works as follows.

The block of interference 1 interferes with the signal of the external interference coming from input 1 from the phantom circuit or the cable jacket. This signal is further used as a compensating signal.

The selected interference signal is fed to the input of the first adjustable amplifier 5 and the first correlator 3 With the help of a phase shifter 2, which provides a phase shift of all the spectral components of the selected interference signal by 90, a signal with a spectrum orthogonal to the original is created. This signal came to the inputs of the second regulated amplifier 6 and the second correlator 4.

A network amplifier 8, connected to a linear path through input 2 and output, connects and amplifies a part of the linear spectrum affected by external noise. The signal selected by the selective amplifier 8, together with the noise, is fed to the second inputs of the first and second correlators 3 and 4. The output of the first and second correlators 3 and

4, a voltage is formed, the shape and knowledge of which is determined by the function of mutual correlation between the interference-compensating signal from the output of the interference generator 1 and the interference signal in a two-wire circuit, selected by the selective amplifier 8. Moreover, the output of the first correlator 3 is voltage proportional to. the component of the mutual correlation function of these signals, and the output of the second correlator 4, the quadrature component. The first and second adjustable amplifiers 5 and 6, depending on the control voltage from the outputs of the correlators 3 and 4, vary the transmit voltage.

The voltages of the noise-compensating signal at the outputs of the first and second adjustable amplifiers 5 and 6 are proportional to the control voltages taken from the outputs of the first and second correlators 3 and 4, the module and the phase of the interference in the two-wire circuit unambiguously determine the voltage amplitude at the outputs of the first and second control amplifiers 5. and 6. Both voltages, combined geometrically, give a vector of a compensating signal, equal in magnitude and phase to the interference vector, which is then fed out of phase by the output of the adder, 7 in linear RF path system. In this case, the interference voltage decreases sharply, but the signal at the output of the selective amplifier 8 also decreases, which changes the energy ratio at the corresponding inputs of the first and second correlators 3 and 4. At the output of the additional adder 10, a signal is generated that is proportional to the total energy of the same spectral components. the reference signal and the linear path signal. The subtraction element P compares it with a signal proportional to the energy of the signal of the reference channel taken from the output of the additional correlator 9, both inputs of which are connected to the interference block 1. Voltage proportional to the difference of these signals is fed to the control inputs of the interference block 1 and selective amplifier 8, which change the gain, equalizing the energy at both inputs of the first and second correlators 3 and 4.

Claims (1)

The formula is A device for adaptive compensation of external interference, comprising a first correlator, a first adjustable amplifier and a series-connected interference elimination unit, a phase shifter, a second adjustable snubber, an adder, a selective amplifier, and a second correlator whose input is connected through a first correlator and a first adjustable amplifier with another input of the adder, the output is connected to the control input of the second adjustable amplifier, and the other input is connected to the output of the phase shifter, the input of which is connected to another input of the first the second correlator with the other input of the first amplifier; the input of the interference isolation unit is the input of the device for adaptive compensation of external interference, the output and simultaneously the second input of which is the input of the adder, of which In order to compensate for the accuracy of external noise compensation, an additional adder was added to it, an additional correlator and a subtraction element, the control inputs of the interference suppression unit and the selective amplifier are connected to the output of the subtraction element, the inputs are additionally The adder is connected to the outputs of the first and second correlators, and the output is connected to the first input of the subtraction element, the second input of which is connected to the output of the additional correlator, the first and second inputs of which are connected to the output of the interference block.