Digital multiplex transmission system
Patent 5506903 Issued on April 9, 1996. Estimated Expiration Date: 
April 5, 2014. 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.
April 5, 2014. 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 ReferencesVLSI single-chip (255,223) Reed-Solomon encoder with interleaver System and method for transmitting a plurality of digital services Patent #: 5400401 InventorAssigneeApplicationNo. 223217 filed on 04/05/1994US Classes:380/216, Image data converted to digital before modification348/423.1, Arrangements for multiplexing one video signal, one or more audio signals, and a synchronizing signal370/465, Adaptive380/212, Plural video stream multiplexing380/237Including digital audioExaminersPrimary: Cain, DavidAttorney, Agent or FirmForeign Patent References
International ClassH04N 007/167Foreign Application Priority Data1993-04-06 JPAbstractA digital multiplex transmission system wherein the rate of convolution codes can be changed over in accordance with an object of a user without changing the transmission rate. A frame for transmitting system data, first preliminary data, second preliminary data, scramble control data, audio data, video data and Reed-Solomon codes is constructed by allocation of them such that a boundary between each adjacent region may make a vertical straight line. Data of such a frame are coded by convolution coding and then transmitted. When the transmission line is in a deteriorated condition, the rate of the convolution codes is reduced to increase the correcting faculty for the convolution codes. In contrast, when the transmission line is in a good condition, the rate of the convolution codes is increased to transmit a large amount of data.Other References
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