| 摘要 |
A high-speed erasing apparatus for use in a magnetic recording/reproducing system for erasing a recorded signal on a magnetic tape traveling along a predetermined path. The erasing apparatus comprises a flying-erasing head mounted on a rotary cylinder of the system, a full-erasing head disposed at a preceding position of the flying-erasing head in a traveling direction of the tape, and an audio-erasing head provided at a succeeding position thereof in the traveling direction. Also included in the apparatus are a high-speed erase oscillating circuit for supplying the full-erasing head with an output having a frequency higher than N times of the upper limit of the audible range, a video-erase oscillating circuit for supplying the flying-erasing head with an output having a frequency higher than the upper limit of a video signal range, and an audio-erase oscillating circuit for supplying the audio-erasing head with an output having a frequency higher than the upper limit of the audible range. The oscillating circuits are driven so that, at the initial time, the recorded signal is erased by all of the erasing heads with the tape being transported at the industry standard traveling speed and the high-speed erase oscillating circuit is operated so as to, after elapse of a predetermined time, erase the recorded signal by only the full-erasing head with the tape being transported at N times of the industry standard traveling speed.
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