Radio frequency signal processing circuit which prevents stepwise variations of a DC component
Patent 5001693 Issued on March 19, 1991. Estimated Expiration Date: 
September 5, 2010. 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.
September 5, 2010. 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 ReferencesRecord/playback track tracking servo Optical information processor for compensating offset Disc playback apparatus Optical information processing apparatus Reproducing device for frequency modulated signals Patent #: 4815061 InventorAssigneeApplicationNo. 581175 filed on 09/05/1990US Classes:369/47.35, For sampling, digital to analog or analog to digital converting369/44.31, Recording369/44.34Sampling servo systemExaminersPrimary: McElheny, Donald Jr.Attorney, Agent or FirmForeign Patent References
International ClassG11B 007/00Foreign Application Priority Data1987-07-08 JPAbstractA reference level adjusting circuit for a signal containing both DC and RF components, such as provided by a read head in an optical recording and reproduced device. In the reproduction mode, the read input signal is capacitively coupled through an amplifier to an A/D converter. A read input signal detected from an unrecorded area is held and, during the recording mode, is substituted for the presently read input signal. | |
