Radio broadcasting system with transmitter identification
Patent 4252995 Issued on February 24, 1981. Estimated Expiration Date: 
February 24, 1998. 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 24, 1998. 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 3242431 3478169 3902019 Secure two channel SCA broadcasting system Patent #: 4048619 InventorsApplicationNo. 05/878666 filed on 02/17/1978US Classes:381/14, Having transmitter370/496, Signaling375/279, Phase shift keying375/308, Phase shift keying375/329Phase shift keyingExaminersPrimary: Olms, Douglas W.Attorney, Agent or FirmInternational ClassesH04H 1/00 (20060101)G08G 1/09 (20060101) Foreign Application Priority Data1977-02-25 NLAbstractFM radio broadcasting system with transmitter identification by means of a transmitted subcarrier whose frequency is a harmonic of subharmonic of the stereo pilot and which is binary phase modulated with transmitter identification signals. In the transmitter the subcarrier is locked to the stereo pilot and the unmodulated wave, which is required for detection of the transmitter identification signal, is derived in the receiver from the received stereo pilot.Other References
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