Circuit for detecting synchronization pulses in a composite sign

Details Circuit for detecting synchronization pulses in a composite sign Circuit for detecting synchronization pulses in a composite sign

1981-10-26

1984-08-28

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307518, 307358, 307268, 358155, H03B 100, H03K 522, H03K 5153

Patent

active

044686250

ABSTRACT:
Circuit detecting synchronization pulses in a composite signal constituted by synchronization pulses alternating with digital and/or analog signals. The composite signal is applied to first and second detectors. The first detector detects and stores the peak value of the synchronization pulses. The second detector follows and stores the peak value of the composite signal in the same direction as the synchronization pulses, and in particular the base of the synchronization pulse. A comparator receives at its two inputs the stored values and the comparator output assumes a first state when the difference between the stored values is below a predetermined value and a second state when the difference between the stored values is above the predetermined value. The comparator output is shaped and used to trigger a one shot multivibrator to produce narrow pulses of a predetermined duration, free of front and back porch noise, in synchronism with the synchronization pulses in the composite signal.

REFERENCES:
patent: 3492589 (1970-01-01), Rotier
patent: 3706847 (1972-12-01), Smeulers
patent: 3725795 (1973-04-01), Mesenhimer
patent: 3869568 (1975-03-01), Ueda et al.
patent: 4097896 (1978-06-01), Avery
patent: 4349754 (1982-09-01), Bull
patent: 4353091 (1982-10-01), Hoppe

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