SU1363505A1 - Regenerator of digital signal - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to increase noise immunity while limiting the signal in the low-frequency region. The regenerator contains corrections amplifier 1, band-pass filters 2 and 12, demodulator 3, blocking filters 4 and 11, adder 5, impedance 6 clocks, resampling block 7, output block 8, high-pass filter 9, subtractor 10 and modulator 13. This device provides, at the output, a bounded digital signal with a narrowband analog signal, which contains information about the low-frequency components of the digital signal spectrum. The goal is achieved by eliminating the intersymbol interference resulting from the low-frequency limits of the digital signal. 1 il. l so co 05 ate about

Description

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The invention relates to telecommunications technology and can be used in digital transmission systems.

The purpose of the invention is to improve the resistance to a signal in the low-frequency region.

The drawing shows a structural electrical circuit of the proposed regenerator.

The regenerator contains a correction amplifier 1, the first band-pass filter 2, demodulator 3, the first blocking filter 4, the adder 5, the solenoid 6 clock frequency, decide block 7, the output block 8, the high-pass filter 9, the subtractor 10, the second blocking filter 11 , second band-pass filter 12, modulator 13.

The regenerator works as follows.

The input information signal with ikfrequency limitation after the astrotic correction in the corrective silicate 1 is fed to the combined inputs of the first blocking filter 4 and the first band filter 2. The blocking filter 4 prevents the input of the adder 5 30 of the bandwidth analog signal that is separated by the band filter 2 and is fed to the demodulator 3. The narrowband analog signal is the result of the transfer of the low frequency components of the spectrum of the digital signal in the high frequency region along with ektru using any kind of analog modulation. After demodulation in demodulator 3, the low frequency signal is summed with the input Signal in adder 5 and thereby eliminates the intersymbol interference resulting from the low frequency limitations of the digital signal. In the clock frequency selector 6, the regular component of the digital signal is extracted, and at the output of the decision block 7, at times of clock pulses, normalized by height and duration rectangular information pulses are output to the gate input, which through the output block 8 is fed to the filter input 9 high frequencies and to the first input of the subtractor 10; The digital signal bounded by the filter 9 of the upper frequencies is fed from its output

per watt input 11. H with that si filter is a frequency that is less than a signal where with a lag in height, and second field

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to the second input of the subtractor 10 and to the input of the second stop-band filter 11. At the input of the subtractor 10, the low-frequency part of the digital signal that was limited by the high-pass filter 9 is far away. This low frequency signal (the occupied frequency band, which is significantly smaller than the frequency band of the digital signal) is fed to the modulator 13, where using some kind of analog modulation (amplitude, frequency, phase, etc.) is transferred to the high frequency region in the spectrum of the digital signal, while not exiting the path bandwidth. The second band-pass filter 12 passes a useful modulation product, and

the trap filter 11 preliminarily extracts the necessary frequency band from the spectrum of the digital signal. As a result, at the output of the regenerator, a bottom-limited digital signal with a narrowband analog signal, which contains information about the HH3KO4actoTHbix components of the digital signal spectrum.

Mula of the Invention A digital signal regenerator containing a correction amplifier, a serially connected decider unit and an output unit, the first

the input of the decision block is combined with the input of the clock frequency selector, the output of which is connected to the second input of the decision block, characterized in that, in order to increase the noise immunity while limiting the signal in the low-frequency region, two blocking filters are introduced, connected in series with the first band pass a filter, a demodulator and an adder, a high-pass filter connected in series, a subtractor, a modulator, and a second band-pass filter, with the output of the correction amplifier connected to the inputs of the first band-pass filter buffer circuit whose output is connected to a second input of the adder whose output is connected to the first input deciding unit output unit output is connected to the input of the high pass filter and a second input of the subtractor, the outputs of the second fence and bandpass filters are output digital signal regenerator.

Claims (1)

30 claims a digital signal regenerator comprising a correction amplifier, a decision block and an output block connected in series, the first decision block input is combined with the input of a clock frequency accelerator, the output of which is connected to the second decision block input, characterized in that, in order to increase the noise immunity at limiting the signal in the low-frequency region, two barrier filters are introduced, series-connected the first band-pass filter, a demodulator and an adder, series-connected phi a high-pass liter, a subtractor, a modulator and a second band-pass filter, the output of the correction amplifier being connected to the inputs of the first band-pass filter and a blocking filter, the output of which is connected to the second input of the adder, the output of which is connected to the first input of the deciding unit, the output of the output unit is connected to the input of the high-pass filter and the second input of the subtractor, the outputs of the second blocking and bandpass filters are the output of the digital signal regenerator.