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    INTERMODULATION CANCELLING MIXER
    1.
    发明专利
    INTERMODULATION CANCELLING MIXER 未知

    公开(公告)号：CA1179739A

    公开(公告)日：1984-12-18

    申请号：CA402772

    申请日：1982-05-12

    Applicant: MOTOROLA INC

    Inventor： EPSOM ROBERT L

    IPC: H03D7/00 ,  H03D7/16 ,  H04B1/10 ,  H04B1/26

    Abstract: A mixer circuit is provided which achieves substantially reduced intermodulation distortion products as compared with conventional mixers. The present mixer circuit includes first and second mixers situated in first and second signal paths, respectively. A small portion of the signals incident upon the input of the first mixer are coupled to the input of the second mixer via a first coupler. The first coupler effectively substantially attenuates signals incident upon the first mixer before providing said signals to the input of the second mixer, intermodulation products as well as desired signals are generated at the outputs of both the first and second mixer. The output of the second mixer is coupled to the output of the first mixer via a second coupler. The second coupler exhibits an appropriate amount of attenuation, such that the intermodulation products which are coupled from the output of the second mixer to the output of the first mixer exhibit an amplitude equal to the first mixer intermodulation products. Thus, the intermodulation products from the first and second mixers meet at the circuit output in such a manner as to destructively interfere with each other resulting in substantial intermodulation product cancellation while the remaining desired signals are provided to the circuit output.

    SIMULCAST BROADCASTING SYSTEM AND METHOD
    4.
    发明专利
    SIMULCAST BROADCASTING SYSTEM AND METHOD 未知

    公开(公告)号：CA1316985C

    公开(公告)日：1993-04-27

    申请号：CA616300

    申请日：1992-01-28

    Applicant: MOTOROLA INC

    Inventor： EPSOM ROBERT L ,  ERICKSON PAUL M ,  CIZEK PAUL J ,  WILSON CHRISTOPHER H

    IPC: H04B7/26 ,  H04H20/67 ,  H04B7/14

    Abstract: CM-00467H IMPROVED SIMULCAST BROADCASTING SYSTEM AND METHOD A simulcast broadcast system wherein two signals (103 an 106) intended for simultaneous broadcast are transmitted from a source site (100) to remote sites (200) discrete from one another. At the remote sites, the two signals are separately processed, including the introduction of appropriate delay (305 and 312), prior to combining them for broadcast in conjunction with other remote sites. One or more monitoring sites (400) can also be provided to monitor reception coherence within the system and to provide operating measurement information to allow automatic control of various simulcast system parameters, including delay.

    SIMULCAST BROADCASTING SYSTEM AND METHOD
    5.
    发明专利
    SIMULCAST BROADCASTING SYSTEM AND METHOD 未知

    公开(公告)号：CA1306502C

    公开(公告)日：1992-08-18

    申请号：CA608982

    申请日：1989-08-22

    Applicant: MOTOROLA INC

    Inventor： EPSOM ROBERT L ,  ERICKSON PAUL M ,  CIZEK PAUL J ,  WILSON CHRISTOPHER H

    IPC: H04B7/26 ,  H04H20/67 ,  H04B7/14

    Abstract: IMPROVED SIMULCAST BROADCASTING SYSTEM AND METHOD A simulcast broadcast system wherein two signals (103 and 106) intended for simultaneous broadcast are transmitted from a source site (100) to remote sites (200) discrete from one another. At the remote sites, the two signals are separately processed, including the introduction of appropriate delay (305 and 312), prior to combining them for broadcast in conjunction with other remote sites. One or more monitoring sites (400) can also be provided to monitor reception coherence within the system and to provide operating measurement information to allow automatic control of various simulcast system parameters, including delay.

    METHOD AND APPARATUS FOR FORWARDING A DISPATCH COMMUNICATION IN A COMMUNICATION SYSTEM
    9.
    发明公开
    METHOD AND APPARATUS FOR FORWARDING A DISPATCH COMMUNICATION IN A COMMUNICATION SYSTEM 审中-公开
    方法和装置传输在通信系统中分配有关的

    公开(公告)号：EP1055336A4

    公开(公告)日：2005-06-22

    申请号：EP99965088

    申请日：1999-12-02

    Applicant: MOTOROLA INC

    Inventor： BELKIN ANATOLY S ,  EPSOM ROBERT L ,  CHRISTENSEN LAURA A ,  URS KAMALA D

    IPC: H04W4/12 ,  H04W84/08 ,  H04Q7/28 ,  H04Q7/38

    CPC classification number: H04W84/08 ,  H04W4/12

    Abstract: A calling communication unit (210) transmits a dispatch communication request to a communication infrastructure (202). The dispatch communication request includes at least a dispatch identification of a called communication unit (e.g., 216). In response to the dispatch communication request, the calling communication unit receives from the communication infrastructure a telephone number associated with a voice mail server (222) that provides voice mail service to the called communication unit and an identification of a mailbox at the voice mail server. The calling communication unit then transmits to the voice mail server the identification of the mailbox and a voice communication. Finally, the voice mail server stores the voice communication in the mailbox.

    IMPROVED SIMULCAST BROADCASTING SYSTEM AND METHOD.
    10.
    发明公开
    IMPROVED SIMULCAST BROADCASTING SYSTEM AND METHOD. 失效
    SAME波广播系统和方法。

    公开(公告)号：EP0439515A1

    公开(公告)日：1991-08-07

    申请号：EP89912074

    申请日：1989-09-22

    Applicant: MOTOROLA INC

    Inventor： EPSOM ROBERT L ,  ERICKSON PAUL M ,  CIZEK PAUL J ,  WILSON CHRISTOPHER H

    IPC: H04B7/26 ,  H04H20/67

    CPC classification number: H04H20/67 ,  H04B7/2625

    Abstract: L'invention concerne un système de radiodiffusion d'émission relayée dans lequel deux signaux (103 et 106) destinés à une radiodiffuison simultanée sont transmis à partir d'un site de source (100) à des sites éloignés (200) discrets les uns par rapport aux autres. Les deux signaux sont traités séparément au niveau des sites éloignés, y compris l'introduction d'une temporisation appropriée (305 et 312), avant d'être combinés pour être radiodiffusés conjointement avec d'autres sites éloignés. On peut aussi prévoir un ou plusieurs sites de contrôle (400) afin de contrôler la cohérence de la réception dans le système et afin de produire des informations de mesure de fonctionnement et permettre la commande automatique de divers paramètres de systèmes d'émission relayée, y compris la temporisation.

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