Circuit for adjusting the amplitude of a color signal

Details Circuit for adjusting the amplitude of a color signal Circuit for adjusting the amplitude of a color signal

1982-09-10

1985-04-09

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 944

Patent

active

045105219

ABSTRACT:
By means of a digital filter, the chrominance signal is separated from the digitized picture signal and is applied to a variable-gain amplifier which is formed by the series arrangement of a shift stage and a multiplier. The two stages are controlled by a control circuit which receives the maximum amplitude value of the color synchronizing signal, obtained in a digital manner. Depending on this amplitude value the position of the chrominance signal is shifted and thereafter multiplied in the multiplier by a factor of, for example, between 0.5 and 1. Acting thus, the gain factor is split into two sub-factors, one of which is an integral power of 2 and in this way the multiplier is utilized in a much more advantageous manner. The amplitude value of the color synchronizing signal is measured before the amplifier, so that the control is a forward control, none of the problems occurring with closed control loops now being present.

REFERENCES:
patent: 3849593 (1974-11-01), Brun
patent: 4219839 (1980-08-01), Watanabe

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