Timing synchronizing circuit for demodulators

Details Timing synchronizing circuit for demodulators Timing synchronizing circuit for demodulators

1984-03-02

1985-07-09

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329122, 329124, 331 1A, 331 23, 331 27, 375 81, 375120, H03L 708, H04L 2722

Patent

active

045285128

ABSTRACT:
In a timing synchronizing circuit wherein a timing signal is regenerated from a baseband signal subjected to a bandwidth limitation, there are provided a voltage controlled oscillator whose oscillation frequency varies in accordance with a control signal, an A/D converter which samples and shapes the baseband signal by utilizing the output of the voltage controlled oscillator, a decision circuit for deciding the polarity of a differential coefficient of the baseband signal at an optimum sampling point on the basis of an output of the A/D converter, and a logic circuit responsive to the output of the decision circuit to apply a logical operation to a decision signal derived from the A/D converter and which decides whether or not the baseband signal shifts from a level corresponding to the optimum sampling point, thereby producing the control signal for the voltage controlled oscillator. According to this circuit the regenerated timing signal contains only a negligible amount of jitter components and always maintains an optimum timing without using any phase adjustment.

REFERENCES:
patent: 4057762 (1977-11-01), Namiki
patent: 4255713 (1981-03-01), Yoshida
patent: 4423518 (1983-12-01), Hirosaki

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