| 摘要 |
An apparatus using microcomputing system for automatically setting the optimum performance characteristics of a magnetic tape used. When the type of a magnetic tape loaded into a tape recorder is detected, the microcomputing system sets the standard recording level and the standard recording bias level of the magnetic tape in a recording level setting circuit and a bias level setting circuit of the tape recorder, respectively. When an automatic setting instruction and a subsequent recording start instruction are issued, a test signal having a certain frequency range is recorded on the magnetic tape and reproduced therefrom. The reproduced test signal is then supplied to a level deviation detecting circuit which detects the level deviation between the test signal of a predetermined frequency and the reproduced test signal of the same frequency and the level deviation between components of the reproduced test signal which are of different frequency. The microcomputing system corrects the standard recording level and the standard bias level to the optimum recording level and to the optimum bias level on the basis of the detected level deviations, respectively. An erase head to erase the test signal recorded is disposed at a position downstream of a playback head in the running direction of the magnetic tape, and the normal recording is started immediately after completing the automatic setting without rewinding the magnetic tape.
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