| 摘要 |
This invention provides a magnetic recording reproducing system which is able to obtain an optimum recording bias current for various magnetic tapes different in characteristic. The system is designed so that a reference frequency signal of a predetermined level is recorded on a magnetic tape while applying a continuously variable recording bias by use of a triangular waveform or a sawtooth waveform, whose voltage varies linearly, and means is provided to rectify and smooth the reproduced reference signal and to compare a peak value output thereof with an output obtained by suitably attenuating the peak value output and an output obtained through a peak value memory circuit so that the time when the levels of both signals coincide may be detected to stop an increase of the recording bias current, the value of which serving as the optimum recording bias current.
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