| 摘要 |
PURPOSE:To attain an excellent simultaneous monitorings by disposing two pieces of double-azimuth heads on positions aparted with 180 deg. sandwiching the rotary shaft of a rotary drum, and executing a recording and reproducing operation at every half turn of the rotary drum by means of two pairs of a recording and reproducing head alternately at every one turn of the drum. CONSTITUTION:The double-azimuth heads are used for the recording heads AR, BR and the reproducing heads AP, BP which are positioned at 180 deg. to each other, and the winding angle of a magnetic tape around the drum is made 180 deg. to execute recording and reproduction at every half turn of the drum. Therefore, because a recording action and a reproducing action can be executed alternately with actually neglectable overlapping time, a recording signal is not superposed on a recording signal by the crosstalk. As a result, interchangeable recording patterns can be obtained with a drum whose diameter is half compared with conventional case, and at the same time, simultaneous monitorings can be executed without generating any crosstalk.
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