| 摘要 |
<p>PURPOSE:To prevent incorrect selection of a music by enabling a time constant circuit setting up reference time length during the signal level less than the previously set up signal level in an inter-music space detecting signal circuit to switch plural kinds of values. CONSTITUTION:When a transistor (TR) Q1 is turned on by a control signal generated by a control signal generator CSG, the time constant of the time constant circuit 7b is turned to CRR1/(R+R1), and when the TR Q1 is turned off, the time constant is turned to RC. A control signal generated by the control signal generator CSG during the low turning speed of a take-up reel is disabled from turning on the TR Q1, and when the turning speed is increased more than the prescribed value, the TR Q1 is connected to switch the time constant of the time constant circuit 7b, so that the time constant can be automatically set up in accordance with the traveling speed of a magnetic tape.</p> |
