Magnetic recording/reproducing with added intersymbol interference to obtain a partial-response code
Patent 5539588 Issued on July 23, 1996. Estimated Expiration Date: 
February 1, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 1, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod and apparatus for decoding the output signal of a partial-response class-IV communication or recording-device channel Apparatus for decoding a transmitted signal Binary data signal transmission system Apparatus for reproducing data recorded on a magnetic recording medium Correlation code transmission system Patent #: 5276709 InventorsAssigneeApplicationNo. 189641 filed on 02/01/1994US Classes:360/46, Head amplifier circuit360/45, Pulse crowding correction360/65Specifics of equalizingExaminersPrimary: Kim, W. ChrisAttorney, Agent or FirmInternational ClassesG11B 005/09G11B 005/035 Foreign Application Priority Data1993-02-04 JPAbstractA magnetic recording/reproducing uses a wide frequency band of a DC component to the next lowest spectral null frequency point and higher by using an existing recording/reproducing head and medium. Intersymbol interference is added to a magnetic recording channel so that an impulse response comes to a partial-response channel shown by polynomial 1-Dn (Dn is an n-bit signal delay); in which T is a Nyquist interval (reproduction-bit time interval), the values of (n>2) and T are selected by assuming equal frequency interval between the spectral null frequency points 1/nT, and thereby a symbol string having a Nyquist frequency equal to or higher than the second spectral null frequency point from the lowest frequency side excluding the vicinity of the DC component of the recording/reproducing characteristic is recorded or reproduced.Other References
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