| 摘要 |
<p>PURPOSE:To prevent a crosstalk between left and right channels in case of reproduction by a simple constitution, by adding a recording gap detecting device, and making it unnecessary to provide a mixing amplifier required in a conventional method. CONSTITUTION:A quick forward reproducing signal of a magnetic tape, which is fetched from each resistance 22, 24 is applied to an input amplifier 28 of a recording gap detecting device 20. Into an input part of this input amplifier 28, a short circuit 30 which is controlled to a conducting state when no recording gap is detected, namely, at the time of regular mode reproduction is inserted, and this short circuit 30 is constituted of a transistor 32. To the base of this transistor 32, a driving input is provided from a switching circuit 34, and the switching circuit 34 is constituted of a transistor 36 and resistances 38, 40. On the base of the transistor 36, a control input terminal 42 is formed, and when a recording gap is detected, a control signal is applied to the control input terminal 42 from the outside. That is to say, when the transistor 36 does not conduct, supply voltage Vcc is applied to the base of the transistor 32 through a resistance 40.</p> |
