Circuit for adjusting the amplitude of the colour signal

Details Circuit for adjusting the amplitude of the colour signal Circuit for adjusting the amplitude of the colour signal

H - Electricity

04

N

350/73

H04N 9/12 (2006.01) H04N 9/68 (2006.01)

Patent

CA 1194216

29 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 multi- plier. The two stages are controlled by a control cir- cuit which receives the maximum amplitude value of the colour 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 colour synchronizing signal is measured before the amplifier, so that the control is a forward control, none of the pro- blems occuring at closed control loops now being present.

411117

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