Abnormal separation detecting circuits of chromatic signals of S

Details Abnormal separation detecting circuits of chromatic signals of S Abnormal separation detecting circuits of chromatic signals of S

1979-09-07

1981-01-20

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

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358 23, H04N 947

Patent

active

042465990

ABSTRACT:
Abnormal separation detecting circuit of chromatic signals transmitted by a SECAM system comprises a detection circuit which receives a chromatic signal made up of R-Y signals and B-Y signals respectively added with identification signals I.sub.1 and I.sub.2 at their front ends for detecting the identification signals I.sub.1 and I.sub.2 to produce currents corresponding to their frequencies, a differential amplifier comprising a pair of transistors ON OFF controlled by pulse signal of opposite signals which vary their phases in synchronism with the initiation of the periods of the R-Y signals and the B-Y signals of the chromatic signal and respectively applied to the base electrodes of the transistors, a current mirror circuit controlled its operation by the differential amplifier circuit, and a capacitor connected across the juncture of the current output terminal of the current mirror circuit and the current input terminal of the differential amplifier, and a reference potential point to be charged and discharged in accordance with the operation of the differential amplifier.

REFERENCES:
patent: 3336437 (1967-08-01), Brouard et al.
patent: 3555174 (1971-01-01), Bruch
patent: 4072983 (1978-02-01), Aschwanden

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