Device for phase synchronizing a reproduced reference carrier si

Details Device for phase synchronizing a reproduced reference carrier si Device for phase synchronizing a reproduced reference carrier si

1976-12-21

1977-11-08

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325346, 329124, 329135, H03D 500

Patent

active

040577627

ABSTRACT:
A phase synchronizer for a reference carrier signal reproduced in a receiver for a combined amplitude and phase modulated signal comprises a window specifier for specifying windows for preselected ones of true signal points of which the demodulated signal is selectively representative. The phase synchronizer includes a demodulator for producing complex signals representative of coarse signal points so long as the reproduced carrier signal has a phase error which falls within the windows. Differences between the true points and the coarse points falling within the windows are calculated and summed up to produce a control signal for reducing the phase error substantially to zero.

REFERENCES:
patent: 3806815 (1974-04-01), Fletcher et al.
patent: 3970946 (1976-07-01), Matsuo

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