Dynamic magnetic information storage or retrieval – Checking record characteristics or modifying recording...
Patent
1990-03-21
1992-03-03
Severin, David J.
Dynamic magnetic information storage or retrieval
Checking record characteristics or modifying recording...
G11B 502
Patent
active
050937510
ABSTRACT:
The present invention comprises a variable frequency converter, a band-pass filter having a constant center frequency and a predetermined band-width, an effective value detection circuit and a control signal generator for generating a control signal for varying a conversion frequency of the variable frequency converter. A test signal readout from a magnetic recording medium is frequency-converted by the variable frequency converter and the band-pass filter derives a constant frequency signal from frequencies frequency-converted by the variable frequency-converter to derive a predetermined frequency component of the carry noise. The effective value detector detects effective value of the derived frequency component, in which the control signal generator sequentially changes the frequency converted by the variable frequency converter to sequentially change the predetermined frequency component of the derived carry noise signal to thereby obtain equivalent effective values for respective frequency components in the frequency spectrum of the carry noise signal. With the effective values of the respective frequency components of the carry noise signal obtained in this manner, the detected carry noise energy can be easily calculated and by subtracting the base noise energy thereform, the original carry noise energy can be obtained.
REFERENCES:
patent: 3530384 (1970-09-01), Zussman
patent: 3984763 (1976-10-01), Koester et al.
patent: 4764915 (1988-08-01), Efron et al.
patent: 5013616 (1991-05-01), Morichika
Yamaguchi Kiyomi
Yuki Hidetsugu
Hitachi Electronics Engineering Co. Ltd.
Severin David J.
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