Color eliminating circuit

Details Color eliminating circuit Color eliminating circuit

1974-01-10

1976-03-16

Mayer, Albert J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 949

Patent

active

039450333

ABSTRACT:
A color eliminating circuit comprises a killer detection circuit, a band amplifier circuit and a control circuit. The killer detection circuit detects a color burst signal in a chromatic signal applied to an input thereof, and delivers a killer output voltage to the band amplifier circuit. When the killer output voltage is higher than a predetermined operating voltage of the band amplifier circuit, the band amplifier circuit amplifies the chromatic signal supplied thereto; when the killer voltage is lower than the operating voltage, the band amplifier circuit does not amplify the chromatic signal. The control circuit provides a gate pulse for the detection of the color burst signal, which pulse is applied to a further input of the killer detection circuit. When the killer voltage is below the operating voltage of the band amplifier circuit, the control circuit interrupts the provision of the gate pulse, to prevent the killer voltage from being supplied from the killer detection circuit. Thus, where the field strength of received signals is extremely low, an increase in the killer voltage due to noise, which might inadvertently operate the band amplifier circuit, is avoided.

REFERENCES:
patent: 3564124 (1971-02-01), Popovich
patent: 3590147 (1971-06-01), Ong
patent: 3711634 (1973-01-01), Portoulas
patent: 3730982 (1973-05-01), Niimi et al.
patent: 3740461 (1973-06-01), Harwood
patent: 3755618 (1973-08-01), Poppy
patent: 3772463 (1973-11-01), Wakai et al.

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