Circuit recovering the carrier of a signal amplitude and phase m

Details Circuit recovering the carrier of a signal amplitude and phase m Circuit recovering the carrier of a signal amplitude and phase m

1982-09-24

1985-08-27

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329 50, 329135, 375 86, H03D 300

Patent

active

045381119

ABSTRACT:
An apparatus for the recovery of an amplitude-modulated and phase-modulated signal wherein the signal is multiplied by two correction and adjustment signals in phase-quadrature in a pair of multipliers connected in low-pass filters to the sample and decision circuit. The output of the latter is an error signal which represents the phase error of the recovered carrier obtained by the comparison made between the baseband components of the demodulated signal and suitable decision thresholds at a decision instant estimating transmitted digital symbols. A logic circuit is connected to the output of the sample and decision circuit and delivers its output to a pulse generator whose correction train of pulses is filtered before being applied to a voltage-controlled oscillator whose output is applied directly to one of the multipliers and through a quadrature-phase shifter to the other.

REFERENCES:
patent: 3970946 (1976-07-01), Matsuo
patent: 4100499 (1978-07-01), Monrolin
patent: 4352193 (1982-09-01), Acker
patent: 4355402 (1982-10-01), Kromer, III et al.
patent: 4404532 (1983-09-01), Welti

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