公开(公告)号：JPH0574081A

公开(公告)日：1993-03-26

申请号：JP23828391

申请日：1991-09-18

Applicant: SONY CORP

Inventor： TANAKA SHOJI ,  SEKO SATORU

IPC: G11B21/10 ,  H03D13/00

Abstract: PURPOSE:To compute the detected value at the time of phase shift by a jitter, etc., when a position information signal is detected by the phase difference detector, so that the correct result of the detection is obtd. CONSTITUTION:This phase difference detector has an arithmetic means 46 which takes the digital value held by integrating the value obtd. after the position information signal SP and a reference signal SC are subjected to a phase comparison into a computer 44, judges whether the taken-in phase data is 0 deg. or near 360 deg. or not in the computer 44 and converts the result of the judgment to the value of 360 deg. or near 0 deg..

公开(公告)号：JPS6124002A

公开(公告)日：1986-02-01

申请号：JP14577184

申请日：1984-07-13

Applicant: Sony Corp

Inventor： TANAKA SHOJI

IPC: G11B5/027 ,  G11B20/06

CPC classification number: G11B20/06

Abstract: PURPOSE:To prevent an output level of an upper side band from being decreased by using a head so as to record a signal via a phase correction circuit correcting inversely the phase characteristic. CONSTITUTION:The phase correction circuit 20 correcting inversely the phase characteristic is provided to an output of an FM modulator, then the delay in the magnetic flux density against the change in a magnetic field when the AC magnetic field is applied is compensated and the reduction in the FM signal component thereby is prevented. Further, a limiter circuit 10' provided at the input of an FM demodulator 11 eliminates an AM signal depending on the orientation of a magnetic substance of a magnetic sheet 8 and the quantity limiting the signal is far smaller. Thus, the reduction in the output level of the upper side band of the reproducing signal is prevented.

Abstract translation: 目的：通过使用头来防止上边带的输出电平下降，以便通过相位校正电路反相地校正相位特性来记录信号。 构成：相位校正电路20反相校正电路20被提供给FM调制器的输出，然后补偿当施加交流磁场时磁通量密度随着磁场变化的延迟而减小 从而防止FM信号分量。 此外，设置在FM解调器11的输入端的限幅器电路10'根据磁性片8的磁性物质的取向消除了AM信号，并且限制信号的数量要小得多。 因此，防止再现信号的上边带的输出电平的降低。