Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier
Reexamination Certificate
2006-04-25
2006-04-25
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of the amplifier
Reexamination Certificate
active
07035030
ABSTRACT:
The present invention provides a magnetic recording and reproducing apparatus having an amplifier apparatus, which is switched from a recording state to a readout state based on a control signal, reads out a signal containing a servo signal by the signal readout means, and includes the amplifier apparatus for amplifying the signal with an amplifier and outputting the amplified signal. In addition, the amplifier apparatus filters the signals by the filtering means that allows the high frequency portion of signals to pass through with a first cutoff frequency during a first prescribed time period after the readout state has been initiated; a second cutoff frequency that is lower than the first cutoff frequency during a second prescribed time period after the first prescribed time period has passed; and a third cutoff frequency that is lower than the second cutoff frequency after the second prescribed time period has passed.
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Sako Michiya
Takayoshi Kazue
Hudspeth David
Kananen Ronald P.
Rader & Fishman & Grauer, PLLC
Sony Corporation
Tzeng Fred F.
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