To obtain a semiconductor integrated circuit and a magnetic recorder/ reproducer in which the in-band component of the color subcarrier of video signal is not generated, image quality is not deteriorated and fluctuation of working frequency is suppressed.
The magnetic recorder/reproducer comprises a magnetic head 71, a recording/reproducing amplifier 72, and a signal converting circuit 79 for converting a magnetic recording signal into a video signal being transmitted to a monitor. The signal converting circuit 79 comprises a semiconductor integrated circuit including a filter automatic regulation circuit 1 comprising a reference filter 11, a phase comparator 12 and an integrating circuit 13, and an AFC circuit 2 comprising a VCO 21 oscillating in the vicinity of a horizontal frequency for regulating the free run oscillation frequency using the control potential Vf of the filter automatic regulation circuit 1, a phase comparator 22 and an integrating circuit 23.
YASUDA MASARU
TOYOOKA TETSUJI
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