Packet radio
    1.
    发明授权
    Packet radio 失效
    分组广播

    公开(公告)号:US4864564A

    公开(公告)日:1989-09-05

    申请号:US55486

    申请日:1987-05-29

    IPC分类号: H04L12/56

    摘要: A transceiver for a packet radio network comprises a plurality of independently tunable receivers (RX1-RX4) and a single transmitter (TX) tunable to the frequencies of the receivers. Messages on different frequencies of the network can thus be simultaneously received by respective receivers, increasing message handling capacity; additionally or alternatively, one or more of the receivers can be used as an auxiliary channel for one or more functions other than standard reception of data packets. Three auxiliary channel modes are described: Voice Net mode for direct voice communication, Time Division Multiplex Repeater mode for a long-range voice link or bulk data transfer to a single destination, and inter-network gateway mode for transmitting messages to an adjacent network.

    摘要翻译: 用于分组无线电网络的收发机包括多个可独立调节的接收机(RX1-RX4)和可调谐到接收机频率的单个发射机(TX)。 因此,可以由各个接收机同时接收网络不同频率的消息,增加消息处理能力; 附加地或替代地,一个或多个接收机可以用作除标准接收数据分组之外的一个或多个功能的辅助信道。 描述了三种辅助信道模式:用于直接语音通信的语音网络模式,用于远程语音链路的时分复用中继器模式或到单个目的地的批量数据传输,以及用于向相邻网络发送消息的网络间网关​​模式。

    Apparatus for distinguishing between speech and certain other signals
    8.
    发明授权
    Apparatus for distinguishing between speech and certain other signals 失效
    用于区分语音和某些其他信号的设备

    公开(公告)号:US4715065A

    公开(公告)日:1987-12-22

    申请号:US601839

    申请日:1984-04-19

    申请人: John P. Parker

    发明人: John P. Parker

    CPC分类号: G10L25/78 H03G3/342

    摘要: Apparatus for distinguishing betwen speech and, for example, data and noise signals, for example for use in a non-speech squelch circuit in a broadcast receiver, utilises the fact that an autocorrelogram of a speech signal exhibits peaks which wander backwards and forwards along the delay axis, this not being the case for autocorrelograms of most other signals. Autocorrelograms of an input signal applied to an input terminal (1) and hard-limited by means of a comparator (5) are formed under the control of a computer (14) by means of a shift register (3), a multiplexer (10) an inverting EXOR-gate (7), an up/down counter (19) and a memory (41). For each clock pulse fed to the clock input (30) of the shift register the output (11) of the multiplexer, and hence one input of the EXOR-gate, is switched to each of a succession of taps (8) on the shift register. Thus the signal on the first tap (6) of the register is multiplied in succession by the signals on the other taps (8) and the results are used to increment or decrement corresponding quantities in the memory (41) by means of the up/down counter (19). Autocorrelograms relating to successive periods of time are formed in this way and the computer determines the positions of the peaks (if any) in each and by comparison of these positions determines whether they are stationary or wandering.

    摘要翻译: 用于区分语音和例如数据和噪声信号的装置,例如用于广播接收机中的非语音静噪电路,利用这样的事实,即语音信号的自相关曲线表现出沿着 延迟轴,这不是大多数其他信号的自相关图。 通过移位寄存器(3),多路复用器(10)在计算机(14)的控制下,形成施加到输入端子(1)并通过比较器(5)硬限制的输入信号的自相关图 )反相EXOR门(7),上/下计数器(19)和存储器(41)。 对于馈送到移位寄存器的时钟输入(30)的每个时钟脉冲,多路复用器的输出(11)以及因此EXOR门的一个输入被切换到移位上的一系列抽头(8)中的每一个 寄存器。 因此,寄存器的第一抽头(6)上的信号依次乘以另一个抽头(8)上的信号,并且结果用于通过上/下位置(8)来增加或减少存储器(41)中的相应数量, 倒计时器(19)。 以这种方式形成与连续时间段相关的自相关图,计算机确定每个峰值(如果有的话)的位置,并且通过这些位置的比较来确定它们是静止的还是漫游的。