| 摘要 |
<p>PURPOSE:To control easily a tape speed by executing sound recording at a standard tape traveling speed irrespective of a position of a knob of a variable resistor at the time of sound recording, and executing a pitch control by operating the knob at the time of reproducing. CONSTITUTION:At the time of sound recording, the first control terminal 1a of a motor 1 is connected to the second control terminal 1b through a variable resistor 5, its middle point tap terminal 5b, and a sound recording and reproducing changeover switch 4. Accordingly, a constant resistance value is given irrespective of a knob position of the variable resistor 5 and the motor is rotated at a constant speed. On the other hand, at the time of reproducing, the first control terminal 1a of the motor 1 is connected to the second control terminal 1b through the resistor 5, its sliding piece 5a and the sound recording and reproducing changeover switch 4. As a result, a tape speed can be varied by varying a revolving speed of the motor 1, by operating the knob of the resistor 5. In this way, the tape speed can be controlled very easily.</p> |
