| 摘要 |
<p>PURPOSE:To enable the adjustments of two systems by an adjusting work by performing a head switch phase adjustment according to the TV signal of one system and determining the phase adjusting amount for the TV signal of the other system by a calculation. CONSTITUTION:A tape for PAL adjustment is used, a vertical synchronizing signal is extracted from a composite synchronizing signal in an integration waveform fairing circuit 1 by a PG adjusting mode, a waveform fairing is performed for the signal and the signal is transmitted to a phase comparison/ error detection circuit 3. The circuit 3 compares the target phase value stored in a ROM 2 and a measured value and controls a delay pulse preparation circuit 5 so as to be the target phase value. A PG signal is inputted in the circuit 5 via an amplifier/waveform shaping circuit 4 and a delay value is controlled. When the target phase is confirmed in the circuit 3, the delay value at the time is stored in a PAL delay value memory 6. Next, an NTSC delay value is determined in a calculation circuit 7 according to the number of rotation ratio of the PAL and NTSC based on the PAL delay value. Thus, two kinds of adjusted values are obtained by an adjustment.</p> |
