Satellite trunked radio service system
    1.
    发明授权
    Satellite trunked radio service system 失效
    卫星中继无线电业务系统

    公开(公告)号:US06850497B1

    公开(公告)日:2005-02-01

    申请号:US09887691

    申请日:1997-08-29

    IPC分类号: H04B7/185 H04B7/00

    CPC分类号: H04B7/1853

    摘要: In a mobile satellite system, a system for providing satellite communication between multiple users in a closed user group arrangement includes first and second mobile earth terminals (METs) responsively connecter to and registering with the mobile satellite system. The first MET selects a closed user group network identifier (NET. ID) representing a NET group including the first and second METs to establish voice communication therewith and transmits the NET ID to a central controller. The central controller receives the NET ID from the first MET, validates the first MET for communication, validates the NET ID, allocates a frequency for the NET group, and broadcasts the message to the NET group including the second MET informing the NET group of the allocated frequency and the voice communication associated therewith. The second MET tunes to the frequency in response to the message broadcast by the central controller, and the central controller assigns the first MET as current speaker for the NET group.

    摘要翻译: 在移动卫星系统中,用于在封闭的用户组安排中在多个用户之间提供卫星通信的系统包括响应地连接到移动卫星系统并向移动卫星系统注册的第一和第二移动接地终端(MET)。 第一MET选择表示包括第一和第二MET的NET组的封闭用户组网络标识符(NET。ID),以与之建立语音通信,并将NET ID发送到中央控制器。 中央控制器从第一个MET接收NET ID,验证第一个用于通信的MET,验证NET ID,为NET组分配频率,并将消息广播到NET组,包括第二个MET通知NET组的 分配的频率和与其相关联的语音通信。 第二个MET响应于由中央控制器广播的消息而调谐到频率,并且中央控制器将第一个MET分配给NET组的当前说话者。

    Microform viewer
    2.
    发明授权
    Microform viewer 失效
    微型查看器

    公开(公告)号:US4054373A

    公开(公告)日:1977-10-18

    申请号:US658751

    申请日:1976-02-17

    IPC分类号: G02B27/04

    CPC分类号: G02B27/04

    摘要: This invention is a portable hand operated viewer for micro-fiches and other material with writing too small to be read by the unaided eye. A translucent table has a clamp for the reading matter and that carries an adjustable binocular lens unit, with a head piece for correct location and for movement to scan the table. It is cheap and can be assembled by a child and is suitable for use in schools.

    摘要翻译: 本发明是一种便携式手动操作的显微镜和其他材料的手操作观察器,书写太小,无法被肉眼看到。 半透明台具有用于读物的夹具,并带有可调节的双目透镜单元,其具有用于正确位置的头部件和用于扫描工作台的移动。 它是便宜的,可以由孩子组装,适合在学校使用。