| 摘要 |
<p>PURPOSE:To prevent a pilot signal from being sampled by a pseudo synchronizing signal and to normally execute a tracking control by sample-and-holding a pilot signal component after a fixed period from the detection of the pilot signal. CONSTITUTION:Only a pilot signal in an RF signal reproduced by a rotary magnetic head is passed by a BPFA1 in the analog processing system A of a rotary head type digital audio device to remove other band signals. The obtained signal is converted into a DC level and temporarily is subjected to sample-and-hold by an S/N circuit A3, and adder A4 and a mean value circuit A5 and the sampled signal is inputted to S/H circuits A6, A7. The level of the pilot signal on an ON track, the level of crosstalk on one adjacent track and the level of crosstalk on the other adjacent track are temporarily held respectively by the S/H circuits A6, A7, A8 at the timing of a controller/timing generator D8. Thus, the pilot signal component is subjected to sample-and-hold and stable tracking control is executed.</p> |
