| 摘要 |
<p>PURPOSE:To record and reproduce head positioning signals of music without degrading the recording density of a tape by recording a synchronizing signal and an analog head positioning control signal having a single frequency (f) when an inter-music part of a music signal is detected and detecting the analog signal with a prescribed BPF at a reproducing time. CONSTITUTION:The music signal inputted to an analog signal input terminal 2 passes an amplifier 10 and a rectifier 11 and is compared with a prescribed voltage by a comparator 12; and if it is lower than the prescribed voltage, a timing circuit 13 detects an intermusic part, and a head positioning signal generating circuit 15, a modulating circuit 6, and a switch 17 are controlled to record the synchronizing signal and the analog head positioning control signal having the single frequency (f) on a prescribed track if this state continues for a prescribed time. In case of high-speed search where the tape speed is N-number of times as high as the normal speed, recorded signals on a magnetic tape 9 are read out by a reproducing head 19, and head positioning signal is extracted by a regenerative amplifier 20 and a BPF26 having a center frequency fxN and is compared with a reference signal by a comparator 27; and if the head positioning signal is discriminated, it is sent to a control circuit 28.</p> |
