PURPOSE: To adjust hue or the like with simple constitution by converting an input analog color videosignal at an A/D converter into a digital signal, obtaining a luminance signal and a color difference signal by a digital signal processing circuit, restoring them into an analog luminance signal and an analog color difference signal by a D/A converter and adjusting the analog color difference signal level so as to attain the adjustment of color saturation and hue.
CONSTITUTION: An output of a separation circuit 42 of a digital signal processing circuit 4 is fed as it is to the DA converting circuits 52∼54, where analog color difference signals (R-Y)/1.14, (B-Y)/2.03 and a luminance signal Y are extracted. These signals are fed to an analog signal processing circuit 8 and supplied color difference signals are fed respectively to adder circuits 81, 82. Further, the color difference signals are fed to inverter amplifiers 83, 84, and variable resistors 85, 86 are provided between the phase-inverted signal and the original signal respectively and a signal obtained at the slider is fed to the other adder circuits 81, 82 respectively.
| JP2003244722 | VIDEO SIGNAL PROCESSING APPARATUS |
| JPS6022889 | CHROMINANCE SIGNAL PROCESSING CIRCUIT |
OOTA KIMIHIRO
NONOGAKI MASARU
| JPS5352312A | 1978-05-12 |