Adaptive multitone signaling method
Patent 5353342 Issued on October 4, 1994. Estimated Expiration Date: 
December 8, 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.
December 8, 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 ReferencesDigital tone generator Series ringing signal generator Spontaneous caller identification with call-waiting Patent #: 5263084 InventorAssigneeApplicationNo. 987518 filed on 12/08/1992US Classes:379/257, For calling station (e.g., status or progress tones)379/351, Signalling integrity protection (e.g., voice signal immunity)379/361, Electronic (e.g., tone generator)379/418CALL SIGNAL GENERATING (E.G., RINGING OR TONE GENERATOR)ExaminersPrimary: Dwyer, James L.Assistant: Hunter, Daniel S. Attorney, Agent or FirmInternational ClassH04M 003/18AbstractAn inband tone signaling method results in improvements in talk-off and talk-down performance without sacrificing important human factors considerations. The inband tone signal transmitter has a monitor (60) for monitoring the power level in one or more guard bands (1 and 2) of a voiceband signal. A tone generator (64) which is responsive to the monitor (60) generates the inband tone signal consisting of one or more signaling frequencies each at a level such that a desired signal-to-guard ratio is achieved at a detector (50).Other References
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