专利名称：VIDEOTEX SYSTEM 发明人：SIMMONS, Richard, M.申请号：US1985000832
申请日：19850508
公开号：WO85/005239P1
公开日：
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秋风凉
19851121
专利内容由知识产权出版社提供
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摘要：A videotex system employs a subscriber unit (22) at a remote location such as a ur's home. The subscriber unit (22) employs the ur's telephone tone dial (26) for transmission to a communications module at a central location and us the ur's television t (24) for display of information received as frequency-shift-keying signals by the ur's telephone (20). At the central location, the system employs a transmission memory (16) containing the currently desired display, and a microprocessor circuit (28) reads the contents of the transmission memory (16) to nd it by FSK signals to the remote location. The information contained in the transmission memory (16) comes from a host computer, and an antiquity memory (50) having locations corresponding to tho of transmission memory (16) has its associated location ret whenever a transmission-memory location is written. That antiquity-memory location is then incremented whenever the information is nt, and the microprocessor (28) at the central location repeatedly nds the contents of the transmission-memory location that has been nt least frequently as indicated by the contents in the antiquity-memory (50). The invention reduces the cost of the necessary subscriber units, making the videotex rvice more widely acceptable. The u of the antiquity-memory and repeated data transmission reduces the effects of data transmission errors due to random noi.
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申请人：TELELOGIC, INC.
阿胶食用方法地址：196 Broadway Cambridge, MA 02139 US 国籍：US骨结核的症状
代理机构：KRANZ, Delphine @
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