Carrier phase controller for a receiver of phase modulated signa

Details Carrier phase controller for a receiver of phase modulated signa Carrier phase controller for a receiver of phase modulated signa

1987-11-18

1990-05-15

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455302, 455317, 455309, 375118, H04B 110

Patent

active

049264990

ABSTRACT:
A simplified carrier phase control apparatus used in a modem for demodulating a quadrature amplitude modulated data signal, to correct phase jitters of a carrier signal due to a 50 Hz or a 60 Hz frequency of the commercial power supply, and its harmonic wave frequency components. The carrier phase control apparatus has a predictive filter for predicting a carrier phase jitter, the predictive filter composed of band-pass filters with center frequencies of 50 Hz and 60 Hz, and a circuit where the output signals of the band-pass filters are multiplied by the coefficients and added linearly.

REFERENCES:
patent: 4696055 (1987-09-01), Marshall
patent: 4718113 (1988-01-01), Rother et al.

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