Title:
MAGNETIC REPRODUCING CIRCUIT
Document Type and Number:
Japanese Patent JP3130397
Kind Code:
B2
Abstract:
PURPOSE: To automatically obtain a waveform equivalent to a signal symmetrical to the center line which is reproduced only from a longitudinal component even when an asymmetrical waveform in which the ratio of the longitudinal component to a vertical component is not known is inputted to a reproducing circuit by calculating the magnetized component ratio of these components and changing the amplification factor of an amplifier correspondingly to the calculated ratio.
CONSTITUTION: This magnetic reproducing circuit is constituted of a reproducing signal input terminal 11, a Hilbert transformation filter 12, a delay element 13 having the same delay time as the filter 12, a variable amplifier 14 having a -tanα amplification coefficient, an adder 15, a variable amplifier 16 having cosα amplification coefficient a signal output terminal 17, a medium inverted position detector 18, a medium magnetizing ratio detector 19, and a delay element 20. In said constitution, the detector 18 is provided with an arithmetic circuit for finding out a function symmetrical to a magnetism inverting position and the detector 19 is provided with an arithmetic circuit for finding out even and odd function components in a reproducing signal around the magnetism inverting position obtained by the detector 18, so that even when a medium whose magnetizing ratio is not known is reproduced, a waveform equivalent to a signal symmetrical to the center line can be obtained by changing the amplification factor.
Inventors:
Takeshi Terasawa
Application Number:
JP34843692A
Publication Date:
January 31, 2001
Filing Date:
December 28, 1992
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
G11B5/027; G11B5/09; G11B20/10; (IPC1-7): G11B5/09
Attorney, Agent or Firm:
Sota Asahina (1 person outside)