Communication system
    1.
    发明授权
    Communication system 失效
    通讯系统

    公开(公告)号:US4885797A

    公开(公告)日:1989-12-05

    申请号:US199277

    申请日:1988-06-02

    摘要: An audio signal and a selected one of a plurality of sub-audio tones are transmitted to a plurality of receiving each being capable of being conditioned by first, second or third selected sub-audio tones so that either all receivers, or only a select group of all of the receivers or only an intended group are the receivers accept the transmitted audio signal, there being as many selectable second sub-audio signals as there are groups and as many selectable third sub-audio signals as there are receivers.

    摘要翻译: PCT No.PCT / GB86 / 00762 Sec。 371日期:1988年6月2日 102(e)日期1988年6月2日PCT申请日1986年12月15日PCT公布。 出版物WO87 / 03501 日期1987年6月18日。将音频信号和多个子音频音调中的选定一个发送到多个接收,每个接收能够被第一,第二或第三选择的子音频音调调节,使得全部 接收机或者仅仅是所有接收机的选择组或者只有预定组的接收机都接收所发送的音频信号,存在与组和可选择的第二子音频信号一样多的可选择的第二子音频信号, 有接收器。