Recording of digital video signals on a magnetic medium having a particular energy product and surface roughness
Patent 5253122 Issued on October 12, 1993. Estimated Expiration Date: 
October 30, 2011. 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.
October 30, 2011. 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 References 3858514 Data accumulation system Method of controlling apparatus for recording and/or reproducing on a record medium Patent #: 4651232 InventorsAssigneeApplicationNo. 784751 filed on 10/30/1991US Classes:386/112, Digital compressing360/15, RECORD COPYING360/32, CONVERTING AN ANALOG SIGNAL TO DIGITAL FORM FOR RECORDING; REPRODUCING AND RECONVERTING360/40, In specific code or form386/124Digital recording or reproducingExaminersPrimary: Young, W. R.Attorney, Agent or FirmForeign Patent References
International ClassH04N 005/783Foreign Application Priority Data1990-10-31 JPAbstractA magnetic tape for the recording of digital video signals is constituted by a nonmagnetic base having thereon a magnetic layer of at least one thin magnetic metal film which has an energy product of at least 100 G.cm.Oe, and with the surface roughness of the magnetic tape being at most 0.003 μm in center line average height. Such tape, when used with magnetic heads each having a gap defined between portions of the respective head having a saturation magnetic flux density of at least 14 kG., contribute to the maintenance of an acceptable raw error bit rate below 1×10-4 when recording with a recorded bit area of no more than 1.25 μm2 /bit.Other References
Field of SearchRECORD COPYINGContact transfer With magnetic bias SPLITTING ONE INFORMATION SIGNAL FOR RECORDING ON PLURAL DISTINCT TRACKS OR REPRODUCING SUCH SIGNAL CONVERTING AN ANALOG SIGNAL TO DIGITAL FORM FOR RECORDING; REPRODUCING AND RECONVERTING GENERAL PROCESSING OF A DIGITAL SIGNAL In specific code or form Nonreturn to zero Phase code Multi-frequency Data in specific format With incremental movement between record and head | |
