Carrier wave regenerating circuit

Details Carrier wave regenerating circuit Carrier wave regenerating circuit

1982-07-19

1984-11-20

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 39, 375120, 329124, H03D 324

Patent

active

044843372

ABSTRACT:
A circuit for regenerating a carrier wave on the basis of a modulated wave. It comprises a voltage-controlled oscillator, two demodulators supplying two demodulated signals, respectively X for the first and Y for the second; a first decision and regeneration circuit with an input connected to the first demodulator and an output supplying a difference signal (X-X), in which X is a signal regenerated from signal X; a first zero threshold comparator connected to the first demodulator and supplying a signal determining the sign of X, i.e., sgn X; a second zero threshold comparator connected to the decision and regeneration circuit and determining the sign of the difference X-X, i.e. sgn (X-X); a second decision and regeneration circuit connected to the second demodulator and supplying a difference signal (Y-Y), in which Y is a signal regenerated from signal Y; a third zero threshold comparator connected to the second demodulator and supplying a signal determining the sign of Y, i.e. sgn Y; a fourth zero threshold comparator connected to the second decision and regeneration circuit and determining the sign of the difference Y-Y, i.e. sgn (Y-Y); a first logic EXCLUSIVE-OR gate supplying a signal sgn (X-X) sgn (Y); a second EXCLUSIVE-OR gate supplying a signal -sgn (Y-Y) sgn (X); an adder supplying a signal sgn (X-X) sgn (Y) -sgn (Y-Y) sgn (X) applied to the voltage controlled oscillator.

REFERENCES:
patent: 3818347 (1974-06-01), Holsinger
patent: 4095187 (1978-06-01), Yoshida
patent: 4134075 (1979-01-01), Washio
patent: 4143322 (1979-03-01), Shimamura
patent: 4253189 (1981-02-01), Lemoussa et al.
Electronics and Communications in Japan, vol. 56-A, No. 3, 1973, Washington (U.S.) H. Yanagidaira et al.
W. C. Lindsey: "Synchronization Systems in Communication and Control", 1972, Prentice-Hall, Inc. N.J., Chapter 3.

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