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专利名称：DATA AND VOICE COMMUNICATIONS
SYSTEM.
发明人：HUSTIG, CHARLES, H.,WARD, JEFFREY,
L.,MOSES, DONALD, W.,BRADFORD, ROBERT,S.
申请号：EP85901731申请日：19850311公开号：EP01749A4公开日：19881102
摘要：A high speed and relatively error free communications system is disclosed whichenables the high speed transmission of data at a 19.2 kilobit per second rate. The data istransmitted over the same communications medium as voice transmissions, the datatransmission being virtually imperceptible to the user of the analog telephone system.Connection to and from the data terminals is made through an RS232C interface. Aspread spectrum technique is utilized which \"whitens\" the signals of the data terminalregardless of whether the terminal is idle, transmitting or receiving data. Virtual errorfree transmission is achieved by interleaving bits, so that noise does not destroy the data,and by error detection and correction techniques which assure that the data, as received,is identical to that transmitted. By using a variable pseudo random code, privacy of datacommunications are enhanced and cross-talk is substantially eliminated. The resultingsystem is one that can use a single twisted pair wire for transmission and is capable oftransmitting data at a high rate of speed while leaving the analog voice transmissionresident and unaffected on the line.
申请人：APPLIED SPECTRUM TECHNOLOGIES, INC.
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