Horizontal deflection circuit

Details Horizontal deflection circuit Horizontal deflection circuit

1990-05-16

1991-06-11

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315387, 315403, G09G 104, H01J 2970

Patent

active

050235230

ABSTRACT:
A horizontal deflection circuit for a multiple-scanning type television receiver that receives a video signal that can have a number of horizontal frequencies is comprised of a detecting circuit for detecting a deflection width of the input video signal, a comparator for comparing a detected deflection width with a signal proportional to the picture size of the input video signal in the horizontal direction, an adder for adding an output of the comparator and the picture size signal, a voltage signal generating circuit for generating a voltage signal proportional to the horizontal frequency of the input video signal, and a multiplying circuit for multiplying an output signal of the adder and an output signal of the voltage signal generating circuit, wherein a horizontal output circuit is controlled on the basis of the output signal of the multiplying circuit. A horizontal deflection width detecting circuit is also provided, in which a horizontal deflection width of the input video signal is detected by peak-rectifying a horizontal deflection pulse. A discharging current source proportional to the horizontal frequency of the input video signal is connected to a peak-rectifying circuit for detecting the deflection width without error.

REFERENCES:
patent: 4414494 (1983-11-01), Schmidt

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