NTSC signal scanning inverting circuit

Details NTSC signal scanning inverting circuit NTSC signal scanning inverting circuit

1990-06-05

1992-06-16

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

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H04N 974

Patent

active

051228661

ABSTRACT:
In a device for inverting the scanning direction of NTSC signals, signals for every line are converted into digital signals to be stored, which are read out inversely in time. The digital signals thus read out are transformed into a pulse train (sampling signals) having a clock frequency of 4fsc by means of a D/A converter, from which the brightness component is separated by means of a low pass filter. A pulse train of 4fsc of color modulated wave is obtained by forming the difference between the brightness component and the output of the D/A converter. The color modulated wave is obtained through a band pass filter, whose central frequency is fs, after having inverted alternately the pulses in this pulse train in the polarity.

REFERENCES:
patent: 4727411 (1988-02-01), Yamaguchi

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