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    • 9. 发明授权
    • Distributed intercom system with audio bus
    • 具有音频总线的分布式对讲系统
    • US08189753B1
    • 2012-05-29
    • US12082408
    • 2008-04-10
    • Roger P. Soucy, IIIJohn M. CronkGeorge W. Ramsdell
    • Roger P. Soucy, IIIJohn M. CronkGeorge W. Ramsdell
    • H04M1/00H04M1/60H04M9/00
    • H04M11/025
    • A distributed intercom system that interconnects a hub and various keypad and door zone units having microphones and/or speakers via CAT5 or similar cable having multiple twisted pairs. Audio is carried between all devices over a first audio wire pair, in analog signal format, forming an audio bus. Audio twisted pair acts as a data communication bus for control messages. One or more of receiver units may be active, while only one keypad device can be individually instructed to connect its corresponding microphone circuit to the audio bus. Determination of which unit is selected to be the transmitter occurs under the control of the hub. For example, in a case where a first user wishes to speak to another user in a different room, the first user presses a “talk” button at his keypad, causing that keypad to send out a message on a data communication bus to the hub. The hub unit then sends a reply on the data communication bus that grants permission to the first user's keypad to couple its microphone to the audio bus. The message is interpreted by the other stations as an instruction to keep their own microphones disconnected from the bus. A message is also sent to the desired receiving station(s) to couple their speakers to the bus to receive the audio signal.
    • 分布式对讲系统,其通过CAT5或具有多个双绞线的类似电缆将集线器和具有麦克风和/或扬声器的各种键区和门区单元互连。 在所有设备之间通过第一音频线对(以模拟信号格式)传送音频,形成音频总线。 音频双绞线充当控制消息的数据通信总线。 一个或多个接收器单元可以是有效的,而只有一个键盘装置可以被单独指示以将其相应的麦克风电路连接到音频总线。 选择哪个单元作为发射机的确定发生在集线器的控制之下。 例如,在第一用户希望与不同房间中的另一用户通话的情况下,第一用户在其小键盘上按下“通话”按钮,导致该小键盘在数据通信总线上向该中心发送消息 。 然后,集线器单元在数据通信总线上发送答复,该答复授权给第一用户的键盘以将其麦克风耦合到音频总线。 消息由其他站解释为保持自己的麦克风与总线断开的指令。 消息也被发送到期望的接收站,以将其扬声器耦合到总线以接收音频信号。