Spread spectrum coding method and apparatus
Patent 4606039 Issued on August 12, 1986. Estimated Expiration Date: 
July 10, 2004. 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.
July 10, 2004. 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 ReferencesNoiselike amplitude and phase modulation coding for spread spectrum transmissions Electric circuit for the production of a number of different codes Random digital encryption secure communication system Circuit for producing noise generation for sound masking Patent #: 4450321 InventorsAssigneeApplicationNo. 06/629510 filed on 07/10/1984US Classes:375/142, Having correlation-type receiver375/343, Correlative or matched filter375/367, Pseudo noise380/32, Wobbling of carrier380/46, Nonlinear (e.g., pseudorandom)708/250Random number generationExaminersPrimary: Safourek, Benedict V.Attorney, Agent or FirmInternational ClassH04B 1/707 (20060101)Foreign Application Priority Data1983-07-21 FRAbstractIn a process for coding of radio transmissions by spectrum spreading, a signal is phase modulated by means of a 0-pi modulator controlled by a psuedo random sequence formed by combining in accordance with a logical majority function an odd number of elementary codes constituted by pseudo random binary sequences of different lengths. On reception, the synchronization of the code which controls the demodulator is realized by correlating each of the elementary codes with the received signal.Other References
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