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    METHOD AND APPARATUS FOR INTEGRATING VIDEO, VOICE AND COMPUTER DATA TRAFFIC IN A SINGLE, CONFERENCING SYSTEM USING EXISTING TELEPHONE AND CATV CONNECTIONS
    5.
    发明公开
    METHOD AND APPARATUS FOR INTEGRATING VIDEO, VOICE AND COMPUTER DATA TRAFFIC IN A SINGLE, CONFERENCING SYSTEM USING EXISTING TELEPHONE AND CATV CONNECTIONS 失效
    方法和设备集成视频，在一个单一的会议系统语言与电脑进行数据流量通过利用现有的电话和有线电视连接

    公开(公告)号：EP0868795A4

    公开(公告)日：2000-04-19

    申请号：EP96945238

    申请日：1996-12-19

    申请人： INTEL CORP

    发明人： ANDERSEN DAVID B ,  JOHNSON DAVID B ,  KINI VITTAL

    IPC分类号： H04J1/05 ,  H04N7/173

    CPC分类号： H04J1/05

    摘要： A frequency division multiplexed coupler (401) for multiplexing a plurality of signals onto a single telephone wire (636) is disclosed. The frequency division multiplexed coupler (401) comprises a first modulating unit (621) for modulating a frequency of a first outgoing signal to a first modulated signal having a frequency range corresponding to a first carrier signal (601). The frequency division multiplexed coupler (401) further comprises a second modulating unit (622) for modulating a frequency of a second outgoing signal to a second modulated signal having a frequency range corresponding to a second carrier signal (602). A frequency multiplexer (635) is coupled to the first modulating unit (621) and the second modulating unit (622) for multiplexing the first modulated signal and the second modulated signal onto a single telephone wire (636) for transmission to a remote site.

    Verfahren zur Erzeugung eines FDM-Signals
    6.
    发明公开
    Verfahren zur Erzeugung eines FDM-Signals 失效
    一种用于生产FDM信号的方法。

    公开(公告)号：EP0651527A2

    公开(公告)日：1995-05-03

    申请号：EP94115313.2

    申请日：1994-09-29

    申请人： ROBERT BOSCH GMBH

    发明人： Göckler, Heinz, Dr. ,  Grotz, Karlheinz ,  Süssmeier, Georg

    IPC分类号： H04J1/05

    CPC分类号： H04N7/22 ,  H04J1/05

    摘要： Verfahren zur Erzeugung eines FDM-Signals hoher Kanalzahl für Übertragungszwecke in Rundfunk- und Fernseh-Verteilsystemen, wobei die mit einer einheitlichen Abtastrate abgetasteten und digitalisierten Kanalsignale jeweils in interpolierenden digitalen Frequenzumsetzern unter Erhöhung der Abtastrate frequenzumgesetzt und mittels eines Addierers zusammengefaßt werden und wobei mehrere dieser so erzeugten Signale zu dem FDM-Signal zusammengefaßt werden, dadurch gekennzeichnet, daß die frequenzumgesetzten und mittels eines Addierers zusammengefaßten Signale komplexwertige Signale sind, welche in einer zweiten Stufe mittels Filter mit komplexwertigen Koeffizienten unter weiterer Erhöhung der Abtastrate frequenzumgesetzt und in reelle Signale umgewandelt werden, welche mittels eines reellen Addierers zu dem FDM-Signal zusammengefaßt werden.
    Einsatz in einem Rundfunk und Fernsehverteilsystem, insbesondere über Glasfaser.
    Erlaubt hohe Kanalzahl bei extrem hohen Abtastfrequenzen am Ausgang.

    摘要翻译： 一种用于生产FDM信号高数目在广播和电视分配系统用于传输目的信道的方法，所述以均匀的采样速率和数字化的信道信号扫描各自频率转换中通过增加采样率内插的数字频率转换器和由加法器和多个这些所谓的组合 信号被组合以形成FDM信号，其特征在于，所述频率变换和组合由加法器信号是复值信号，这些信号频率转换通过具有复系数滤波器装置在第二阶段中，与在采样率进一步增加，并转换成实信号，其 由实加法器，将FDM信号的装置相结合。 使用在广播电视分配系统，特别是玻璃纤维。 在允许在输出极高的采样速率高通道数。

    FDM-TDM transmultiplexing system
    7.
    发明公开
    FDM-TDM transmultiplexing system 失效
    FDM-TDM传输系统

    公开(公告)号：EP0214649A3

    公开(公告)日：1989-06-14

    申请号：EP86112479.0

    申请日：1986-09-09

    申请人： NEC CORPORATION

    发明人： Ichiyoshi, Osamu c/o NEC Corporation

    IPC分类号： H04J4/00 ,  H04J1/05

    CPC分类号： H04J4/005

    摘要： An FDM-TDM transmultiplexing system for a modulation demodulation device which is applicable to a regenerative repeating system of a satellite or a ground radio communication system is disclosed which uses chirp-z-transform. A chirp filter (102) is implemented with a digital circuit. The circuit scale of the digital chirp filter (102) increases in proportion to a square root of the total number of channels N, enhancing miniaturization of an FDM-TDM transmultiplexer (100A).

    DATA AND VOICE COMMUNICATIONS SYSTEM.
    8.
    发明公开
    DATA AND VOICE COMMUNICATIONS SYSTEM. 失效
    传输系统数据和同意。

    公开(公告)号：EP0174989A4

    公开(公告)日：1988-11-02

    申请号：EP85901731

    申请日：1985-03-11

    申请人： APPLIED SPECTRUM TECH

    发明人： HUSTIG CHARLES H ,  WARD JEFFREY L ,  MOSES DONALD W ,  BRADFORD ROBERT S

    IPC分类号： H04J1/08 ,  H03M5/12 ,  H04B1/69 ,  H04L1/00 ,  H04M11/06 ,  H04J1/05 ,  H04B1/44

    CPC分类号： H04L1/0071 ,  H03M5/12 ,  H04B1/69 ,  H04L1/004 ,  H04M11/062 ,  Y02D50/44

    摘要： A high speed and relatively error free communications system is disclosed which enables the high speed transmission of data at a 19.2 kilobit per second rate. The data is transmitted over the same communications medium as voice transmissions, the data transmission being virtually imperceptible to the user of the analog telephone system. Connection to and from the data terminals is made through an RS232C interface. A spread spectrum technique is utilized which "whitens" the signals of the data terminal regardless of whether the terminal is idle, transmitting or receiving data. Virtual error free 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 data communications are enhanced and cross-talk is substantially eliminated. The resulting system is one that can use a single twisted pair wire for transmission and is capable of transmitting data at a high rate of speed while leaving the analog voice transmission resident and unaffected on the line.