| 摘要 |
<p>PURPOSE:To prevent increase of predictive error on color difference signals and improve bit condensing rate by making predictive coding processing of color difference signals between signals modulated in the same modulating phase at the time of predictive coding. CONSTITUTION:A predictive filter is provided with a predicting device 14Y for luminance signal and a predicting device 14C for color difference signal. A one line delay circuit 15Y is connected to the device 14Y and to one line delay circuits 15Ca, 15Cb are connected in series to the predicting device 14C, and these two systems are switched and selected by a change-over switch 16. Predictive data are obtained on Hadamard transformed data of color difference signals CW, CN basing on data two lines before, and accordingly, predictive coding processing is made between Hadamard transformed data of color differ ence signals modulated in the same modulating phase, that is, between color difference signals CW or between color difference signals CN. Thus, as correlation between color difference signals is high, accuracy of prediction is raised and condensing rate is improved.</p> |
