| 摘要 |
<p>PURPOSE:To simplify mechanical constitution by eliminating the needs for a track and head used only for speed control, by recording a speed control signal on the same track as a sound signal. CONSTITUTION:Reference signal (a) of reference oscillation circuit 1 is inputted to modulator circuit 2, where reference signal (a) is modulated by control data signal (b). Modulated signal (c) obtained in this way is recorded on magnetic tape 3 together with a sound signal through recording head 4 after being supplied to post- stage superposition circuit 7. Next, a sound superposition signal regenerated by regenerative head 5 is supplied to separator circuit 13, where it is separted by a filter inside of this circuit into the sound signal and modulated signal (d), and the sound signal is derived from 14 while modulated signal (d) is supplied to demodulating circuit 15, which outputs a speed signal. In this way, the needs for a track and head used only for the control are eliminated and mechanical constitution can be simplified.</p> |
