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    In-band data transmission system
    2.
    发明授权
    In-band data transmission system 失效
    带内数据传输系统

    公开(公告)号：US3735048A

    公开(公告)日：1973-05-22

    申请号：US3735048D

    申请日：1971-05-28

    Applicant: MOTOROLA INC

    Inventor： TOMSA S ,  EASTMOND B

    IPC: H04B7/08 ,  H04M11/06

    CPC classification number: H04B7/082

    Abstract: An information transmission system for transmitting data signals simultaneously with audio signals in an audio channel includes a gate circuit at the transmitting unit for interrupting the transmitted audio at a rate controlled by the data signal, and a detector at the receiving unit for detecting the interruptions in the audio and reconstructing the data signal from the interruptions. The duration of the interruptions is selected to be short enough so as not to be readily detectable audibly. The system is suitable for use in a multiple radio-receiver system wherein signals are transmitted from spaced receivers to a central station with data signals indicating the quality of the signals received at each receiver.

    Abstract translation: 一种用于在音频通道中与音频信号同时发送数据信号的信息传输系统包括：发送单元处的门电路，用于以由数据信号控制的速率中断发送的音频;以及接收单元处的检测器， 从中断音频和重构数据信号。 选择中断的持续时间足够短，以免听起来容易察觉。 该系统适用于多个无线电接收机系统，其中信号从间隔的接收机传输到中心站，数据信号指示在每个接收机处接收到的信号的质量。

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