| 摘要 |
<p>PURPOSE:To attain the high stability of an automatic color phase adjustment of 360 deg. by converting the timing of a data signal to that of a reference clock signal after a micro phase adjustment within 90 deg. and performing a coarse phase adjustment at every 90 deg.. CONSTITUTION:At a video signal, the burst signal of which is detected by a detector 4, is given to an oscillator 7 and a sampling pulse locked with the burst signal is supplied to an A/D converter 8 and a timing adjuster 10 and also, a subcarrier periodic signal is given to the adjuster 10. And a digitized signal and the subcarrier periodic signal are adjusted by the timing of the reference clock signal, the data rate of them is converted, and they are outputted to a variable delaying device 12, and also, an adjusting subcarrier periodic signal is sent to a delay volume controller 11. The controller 11 compares the phase of each input and delay volume control signal to the delay device 12 corresponding to phase differences 0 deg., 90 deg., 180 deg. and 270 deg., and the number of latching stages are followed relatively to the change of 0-3 clocks. Thereby, an output data having the same phase as a reference subcarrier can be always obtained.</p> |
