Spread spectrum signal receiving apparatus
Patent 5222099 Issued on June 22, 1993. Estimated Expiration Date: 
January 16, 2012. 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.
January 16, 2012. 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 ReferencesSpread spectrum communication system Receiver for bandspread signals Receiver for bandspread signals Transmitting and receiving systems Digital direct-sequence spread-spectrum modem Patent #: 4894841 InventorsAssigneeApplicationNo. 821990 filed on 01/16/1992US Classes:375/149, Having specific code synchronization455/12.1Space satelliteExaminersPrimary: Swann, Tod R.Attorney, Agent or FirmForeign Patent References
International ClassH04K 001/00Foreign Application Priority Data1991-01-21 JPAbstractA spread spectrum signal receiving apparatus comprising: a radio frequency processing circuit for converting a spread spectrum signal into an intermediate frequency signal; a binary encoder for encoding the intermediate frequency signal; a pseudo-random noise code generator; a code driver for controlling the phase and the chip speed of the output of the code generator; a first multiplier for multiplying the binary signal by the output of the code generator; a numerical controlled oscillator for outputting first and second carrier signals; second and third multipliers for multiplying the output signal of the first multiplier respectively by the first and second carrier signals; first and second low-pass filters supplied with the output signals of the second and third multipliers respectively; and a microcomputer having functions to produce signals for controlling the numerical controlled oscillator, and functions to produce signals for controlling the code driver.Other References
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