| 摘要 |
PURPOSE:To stabilize a servo signal and to shorten a muting time, by outputting a frame detection pulse signal from a switching circuit by means of a switching signal, and by outputting a rotation detection pulse signal by blocking the switching signal. CONSTITUTION:If it is judged that tape run is stabilized according to a reproduction frame synchronizing signal, a relay 34 is switched to a reproduction contact P by the first counting pulse while an inverted switching command signal is inputted to a switching controlling part 56. Also, a frame detection pulse signal and controlling reference pulse signal are inputted to a phase comparison circuit 35, and a motor 23 is servo-controlled according to their phase difference. If reproduction mode is changed to stop mode, a FF55 is resetted so that a switching signal being outputted from its Q output terminal (q) is blocked to turn a transistor 38 off and to switch the relay 34 to a recording contact (r). As the result, a rotation detection pulse signal and the controlling reference pulse signal are inputted to the circuit 35, and the motor 23 is servo-controlled according to its phase difference. |
