| 摘要 |
PURPOSE:To prevent generation of picture color shift by allowing an address counter which supplies an address to a memory element restored by extending the time base of a time-base compression color difference signal to follow up a horizontal synchronizing signal as a constitution element of a PLL circuit. CONSTITUTION:After a luminance signal and a color difference signal of a color image signal are compressed in terms of time base, they are multiplied by time division, and recorded in a recording medium by modulation of frequency. A time-base compression color difference signal, which is converted in an analog- digital manner by an A/D converter 15 at the time of reproduction, is supplied to an RAM16, and the signal becomes a regenerative color difference signal whose time-base is restored by extending time-base by a RAM35. A signal from a synchronizing separation circuit 6 is supplied to a PLL circuit 49 which is composed of a comparator 44, an LPF45, a VCO46, a counter 47 and an address counter 48. The address from the counter 48 is supplied to the RAM16, and the relation between the timewise position at which a horizontal synchronizing signal arrives, and the timewise position which switches the condition of writing and reading of the RAM16, is controlled constantly. In this way, generation of picture color dislocation can be prevented. |
