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1. 发明专利

FI942783A0 未知
公开(公告)号：FI942783A0
公开(公告)日：1994-06-13
申请号：FI942783
申请日：1994-06-13
申请人： AT & T CORP
发明人： BREMER GORDON , CHAPMAN JOSEPH QUINN , HENDERSON P MICHAEL , HOLMQUIST KURT ERVIN , KO KENNETH DAVID , SMITH RICHARD KENT
IPC分类号： H04J7/00 , H04L27/34 , H03M
摘要： A method and apparatus for control of concurrent communication of analog information and digital information. In general terms, when the communication channel is viewed as a multi-dimensional space, the digital information signal is divided into symbols, and the symbols are mapped onto the signal space with a preset distance between them. The analog signal, generally limited in magnitude to less than the distance separating the symbols, is converted to component signals and added (i.e., vector addition) to the symbols. The sum signal is then transmitted to the receiver where the symbols are detected and subtracted from the received signal to yield the analog signal components. The transmitted analog signal is recreated from those components. Both half-duplex and full-duplex operation is available in accordance with this invention. The illustrative embodiment includes control means that is sensitive to input signals applied to the modem disclosed herein. To wit, the control is sensitive to signals from the analog port, signals from the digital port, and signals from the port that carries the combined digital and analog signals. Operation of the near-end modem is controlled as well as operation of the far-end modem.

2. 发明专利

CA2147907A1 METHOD FOR DIAL-IN ACCESS SECURITY USING A MULTIMEDIA MODEM 未知
公开(公告)号：CA2147907A1
公开(公告)日：1995-12-21
申请号：CA2147907
申请日：1995-04-26
申请人： AT & T CORP
发明人： HOLMQUIST KURT ERVIN , SMITH RICHARD KENT
IPC分类号： G06F3/16 , G06F1/00 , G06F13/00 , G06F21/00 , G06F21/20 , H04M11/06
摘要： A multi-media modem is used to provide a security access arrangement that identifies a calling party to a computer system. In particular, a multi-media modem couples both an analog channel and a data channel to the computer system. The analog channel conveys the calling party's identification information, while the data channel conveys a data signal from the calling party. The computer system verifies the calling party's identification information communicated over the analog channel and, if the verification is successful, immediately establishes, or continues, data communications with the calling party over the data channel.

3. 发明专利

CA2159845A1 ENABLING TECHNIQUE FOR QUICKLY ESTABLISHING HIGH SPEED PSTN CONNECTIONS IN TELECOMMUTING APPLICATIONS 未知
公开(公告)号：CA2159845A1
公开(公告)日：1996-05-04
申请号：CA2159845
申请日：1995-10-04
申请人： AT & T CORP
发明人： HANSON BRUCE LOWELL , HOLMQUIST KURT ERVIN , STRAHS LEE B
IPC分类号： H04M11/00 , H04M11/06 , H04M1/26
摘要： A data communications equipment, e.g., a modem, uses a telephone number of a remote endpoint to retrieve an associated set of stored configuration parameters. These stored configuration parameters allow the modem to quickly initialize itself and thereby significantly reduce the training interval with the remote modem. In addition, the use of the telephone number of the remote endpoint allows quick identification of modulation format, e.g., that a fax call is being established.

4. 发明专利

FI942783A 未知
公开(公告)号：FI942783A
公开(公告)日：1994-12-15
申请号：FI942783
申请日：1994-06-13
申请人： AT & T CORP
发明人： BREMER GORDON , CHAPMAN JOSEPH QUINN , HENDERSON P MICHAEL , HOLMQUIST KURT ERVIN , KO KENNETH DAVID , SMITH RICHARD KENT
IPC分类号： H04J7/00 , H04L27/34 , H03M3/00 , H04M11/06 , H04L27/32 , H04Q11/04
摘要： A method and apparatus for control of concurrent communication of analog information and digital information. In general terms, when the communication channel is viewed as a multi-dimensional space, the digital information signal is divided into symbols, and the symbols are mapped onto the signal space with a preset distance between them. The analog signal, generally limited in magnitude to less than the distance separating the symbols, is converted to component signals and added (i.e., vector addition) to the symbols. The sum signal is then transmitted to the receiver where the symbols are detected and subtracted from the received signal to yield the analog signal components. The transmitted analog signal is recreated from those components. Both half-duplex and full-duplex operation is available in accordance with this invention. The illustrative embodiment includes control means that is sensitive to input signals applied to the modem disclosed herein. To wit, the control is sensitive to signals from the analog port, signals from the digital port, and signals from the port that carries the combined digital and analog signals. Operation of the near-end modem is controlled as well as operation of the far-end modem.

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