| 摘要 |
PURPOSE:To reproduce a broad band luminance signal and a high quality chrominance signal without deterioration of band width of a luminance signal by giving 1H delay to the luminance signal of broad band and adding a high frequency component of a delay signal to a luminance signal of narrow band. CONSTITUTION:As S waveform at transmission is reproduced to an output of a dynamic de-emphasis circuit 31 and inputted to D/A converters 47-50 via an A/D converter 57, time axis restoration RAMs 40-43, and 1H delay circuits 44- 46. A broad band luminance signal at each other line as shown in Yw is obtained at an output of the A/D 47 and a luminance signal with different band width is obtained at each line as shown in YNW is obtained in an output of an A/D 48. An HPF51 and an adder circuit 52 add the signal to the high frequency component YNW of the YW to obtain a luminance signal Y' unchanged with the band width at each line from the YNW and the YW. An output signal of the circuit 52 is incomplete for the horizontal synchronizing signal, a synchronism addition circuit 53 adds a fH signal from a PLL so as to obtain the signal Y'. |
