| 摘要 |
PURPOSE:To enable to keep the interchangeability with a simplified circuit constitution, by superimposing the field discrimination pulse on a low conversion carrier chrominance signal and corresponding the playback device with the recorder for each head. CONSTITUTION:The playback signal obtained from the rotating magnetic heads 3A, 3B at the playback device 1 is picked up for the low area conversion carrier chrominance signal Sc at LPF5 and fed to the addition circuit 8. On the other hand, from the drum servo circuit 13, the field pulse PA for head switching is picked up to be fed to the circuit 8. Thus, the signal superimposing the pulse PA on the signal SC is obtained at the terminal 14. This signal is fed to the terminal 22 of the recorder 2, and the signal SC is obtained at the output side of HPF25 and the pulse PA is obtained at the output side of LPF26. The signal SC is added with the FM luminance signal at the addition circuit 24 to be give to the magnetic rotating heads 28A and 28B. Further, after the pulse PA is wave-shaped 29, it is fed to the drum servo circuit 30 as the servo reference signal. The circuit 30 controls the drum motor 30 by taking the pulse PA as the reference. |
