Digital signal transmission
Patent 4410878 Issued on October 18, 1983. Estimated Expiration Date: 
October 27, 2000. 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.
October 27, 2000. 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 3434059 Apparatus for word synchronization in an optical communication system Optical pulse transmission system Patent #: 4008390 InventorAssigneeApplicationNo. 06/201266 filed on 10/27/1980US Classes:341/56, To or from multi-level codes375/353, PULSE AMPLITUDE MODULATION398/183, Having particular modulation398/189Pulse modulationExaminersPrimary: Miller, J. D.Attorney, Agent or FirmInternational ClassesH04B 10/152 (20060101)H04B 10/155 (20060101) H04L 25/49 (20060101) Foreign Application Priority Data1979-11-03 DEAbstractIn a method and apparatus for transmitting digital signals by means of signal generators by initially converting a double current pulse train, under control of bit clock pulses and before transmission, into a first unipolar pulse train composed of pulses corresponding to all positive transmission pulses and into a second unipolar pulse train composed of pulses corresponding to all negative transmission pulses, the pulse trains are code converted independently of the duration of the bit clock pulses for producing a converted signal having a first transmitting amplitude in correspondence with each pulse of the first pulse train and a second transmitting amplitude in correspondence with each pulse of the second pulse train, the second amplitude differing from the first, and the converted signal is applied to a signal generator for producing an output signal corresponding to the converted signal and in which the transmitting amplitudes corresponding to both unipolar pulse trains vary the output signal in the same polarity direction.Other References
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