SU540344A1 - Phase Difference Modulation Signal Detector - Google Patents

Description

one

The invention relates to communication technology and can be used in data communication equipment.

Phase-difference modulation signal detectors are known, performed in a form of hybrid compounds, delay lines, and an amplitude push-pull detector.

The closest technical solution is a phase difference modulation signal detector comprising a delay line and a phase shifter connected between the input and output hybrid devices | CT1va.M1I 1.

However, this detector is characterized by the presence of spurious amplitude modulation.

The purpose of the invention is to reduce spurious amplitude modulation.

For this purpose, a regenerative amplifier is additionally included in the phase difference modulation detector between the delay line and the phase shifter, and a divider is connected to the output of the output hybrid connection

POWER.

Such a detector allows for the reduction of spurious amplitude modulation at the output of the autocorrelation circuit and allows the reference signal, which controls the gain in time, to be reused.

The drawing shows a structural electrical circuit of the detector of phase-difference modulation signals.

The detector of the phase difference difference moduli module contains delay line 1, phase shifter 2 connected between input 3 and output 4 hybrid connections, and between line 1 delay and phase shifter 2 a regenerative amplifier 5 is additionally connected, and to the output of the output hybrid

connection 4 connected power divider. sti 6.

The detector of phase-wise modulation signals operates as follows. The original sigdal with phase difference modulation is fed to the input (hybrid 3, in which the signal is divided into two parts by power. One part comes not | ON; usually to the input of hybrid 4 (affixed oipnal), but the other zaderl: It is in the delay line 1, the amplifier 5 and the phase shifter 2 for the magnitude of the clock interval (reference signal) and is fed to the second input of the hybrid connection 4, where the vector is summed with the received signal: M and through the divider 6 enters the detector output. The transmission channel filters the quadrature components of the signal, which, in the case of four-position phase difference modulation, are used to transmit an independent information channel whose amplitude is determined by the amplitude of the signal to be detected. Thus, due to the meander form of the detector gain, the most the filtering of the quadrant channel and the increase in the interference itself. Due to the fact that the part of the signal passing through the delay circuit has a higher power level than that of the non-delayed mode, the detector's operation mode is a mixer mode with zero intermediate frequency, and, thus, the biasing effect of the parasitic ampli is eliminated. pulse modulation of the pulses at the output.

Claims (1)

1. T. R. Rowbotham, M. Berry. Conference on trunk telecommunications by quides waves. September - Oktober, London, 1970 (prototype). Oporn / and signal