| 摘要 |
<p>PURPOSE:To eliminate a fixed head and increase the S/N of a signal by recording pilot signals which differ in frequency from each other at a 1st and a 2nd part occupying part of a track and then recording a blanking signal in the gap between both the parts. CONSTITUTION:A selecting circuit 19 selects a pilot signal f0 from a pilot generating circuit 25 for a period of pulse width tau1 (=tau) with a pulse D from a delay multivibrator circuit 11, a pilot signal (f) for a period of pulse width tau3(=2pi) with a pulse J from a two phase dividing circuit 18, and a pilot signal f2 for a period from width tau3 with a pulse K from the circuit 18. Further, the circuit 19 selects the blanking signal fB from a blanking signal generating circuit 26 for periods of respective pulse widths with pulses C, E and G from delay multivibrator circuits 10, 12, and 14. Those signals are rearranged in time-series order and pulses are sent out of an output L in the order of the signals f0 and f1 in a period of H or in the order of the signals f0 and f2 for a period of L while having the signal fb added before and behind them.</p> |
