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    • 2. 发明授权
    • Multiple phone line adaptor
    • 多路电话线适配器
    • US5590185A
    • 1996-12-31
    • US409225
    • 1995-03-25
    • Harold SandlerKendy Ip
    • Harold SandlerKendy Ip
    • H04M1/72H04M1/738H04M1/00
    • H04M1/72H04M1/738
    • The present invention is a two line phone adaptor that allows two separate phone lines to be connected to and controlled by a single line DTMF phone. The two line phone adaptor has one ring detector for each line and one hold circuit for each line. The adaptor also has an electronic line selector circuit, a DTMF decoder and an off hook detector. All of the above circuits are connected to a micro controller that contains the software that defines the functions of the adaptor. The adaptor does not have any user accessible control buttons except for an on/off switch. The adaptor will automatically engage the `ringing line` and transfer the ring signal to the attached phone to generate an audible ringing sound. When the phone is taken off the hook, the adaptor will automatically seize a `free line` for use. The adaptor is controlled by the 3.times.4 keyboard of the attached DTMF single line phone and provides the functions such as music on hold, manual line select and three party conferences.
    • 本发明是一种双线电话适配器,其允许两条独立的电话线路连接到单线DTMF电话并由其控制。 两线电话适配器为每条线路提供一个振铃检测器,每条线路都有一个保持电路。 适配器还具有电子线路选择器电路,DTMF解码器和脱钩检测器。 所有上述电路都连接到包含定义适配器功能的软件的微控制器。 除了开/关开关之外,适配器没有任何用户可访问的控制按钮。 适配器将自动进入“振铃线”,并将振铃信号传送到所连接的手机,以产生可听见的振铃声。 当手机脱钩时,适配器将自动抓住一个“自由线”供使用。 适配器由连接的DTMF单线电话的3x4键盘控制,并提供保持音乐,手动线路选择和三方会议等功能。