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Abstract

A method and an apparatus for automatically establishing proper adjustment of recording bias current to obtain a flat reproduction frequency characteristic with a three-head type taperecorder in which sound recorded by a recorder head on a running magnetic tape may be immediately reproduced by a reproducer head immediately downstream of the recorder head. In the method and the apparatus, a composite calibration signal is generated by mixing a lower frequency signal and a higher frequency signal having the same level, the composite calibration signal is then recorded on a running tape while chronologically consecutively altering intensity of the recording bias current, immediately thereafter the recorded composite calibration signal is reproduced from the running tape and filtered off to obtain component lower and higher frequency signal outputs, subsequently the output sound levels of the filtered lower and higher frequency signals are compared, and finally the alteration of the recording bias current intensity is stopped when the output sound levels of the filtered lower and higher frequency signals have become substantially identical with each other.

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First Claim