| 摘要 |
<p>PURPOSE:To execute a tracking control of a four-frequency system by a device being capable of recording simultaneously three system signals, by allowing four kinds of pilot signals for a tracking control and four heads for recording these signals to correspond to each other to one-to-one, and switching the corresponding relation by a first mode and a second mode. CONSTITUTION:When usual recording is switched to high speed recording by a switch 24, a signal of a high level is inputted to a DATA input of a D-flip 26. By a rise of the next clock signal, a switching signal is transmitted to changeover switches 32, 33, a usual recording side (L) is switched to a three system recording side (H), and pilot signals f2, f4 are replaced and supplied to a head. Subsequently, in case of returning the three system recording to the usual recording, when the changeover switch 24 is returned to the usual side (L), the D-flip-flop 26 returns an output signal to a low level by the next clock and the changeover switches 32, 33 are operated. In such a way, in case of recording simultaneously video signals of three systems, and also, in case of recording a video signal of one system, four kinds of pilot signals can be recorded so as to obtain a prescribed array by all the same circuit.</p> |
