公开(公告)号：US4562310A

公开(公告)日：1985-12-31

申请号：US594931

申请日：1984-03-29

申请人： James M. Watters ,  Donald E. Clement

发明人： James M. Watters ,  Donald E. Clement

IPC分类号： H04M3/62 ,  H04M1/66

CPC分类号： H04M3/62

摘要： An attendant console for use with an electronic private automatic branch exchange (EPABX) includes a jack for removably connecting an attendant headset or handset to the console. A switch array in the console provides indications of attendant control action and logic circuitry connected to the switch array registers the indications. Gates are connected in series with the switch array for preventing registration of the indications in response to the attendant set being disconnected, such that control actions as may be indicated at the switch array while the attendant is away from the console are of no consequence.

摘要翻译： 用于电子专用自动分支交换机（EPABX）的话务员控制台包括用于将话务员耳机或手机可拆卸地连接到控制台的插孔。 控制台中的开关阵列提供伴随的控制动作的指示，连接到开关阵列的逻辑电路注册指示。 门与开关阵列串联连接，用于防止响应于话务员断开连接的指示的登记，使得当话务员离开控制台时可能在开关阵列处指示的控制动作是没有任何结果的。

公开(公告)号：US4293740A

公开(公告)日：1981-10-06

申请号：US180882

申请日：1980-08-25

申请人： William D. Gibb ,  Donald E. Clement

发明人： William D. Gibb ,  Donald E. Clement

IPC分类号： H04M9/10 ,  H04M1/60

CPC分类号： H04M9/10

摘要： A hands free answer feature is provided in a key telephone system which includes an intercom lead pair for providing intercommunication between key telephone station sets and a signalling path for providing audible signals via a loudspeaker circuit in the key telephone station sets. The hands free intercom feature is provided by the addition of a hybrid circuit including first and second unidirectional signal paths for coupling a.c. signals between the intercom lead pair and the signalling lead. A d.c. control signal having first and second d.c. signal states is generated on the signalling lead in response to a ratio of amplitudes of signals in the first and second signal paths being greater or lesser than a predetermined ratio. The loudspeaker circuits each include a receive signal path connected to a loudspeaker. A transmit path and path switching circuitry are added to the loudspeaker circuit. The path switching circuitry is responsive to the first and second states of the d.c. control signal to alternately activate one and the other of the transmit and receive signal paths whereby the hands free answer intercom feature is provided.

摘要翻译： 在一个关键电话系统中提供了一个免提应答功能，该电话系统包括一个内部对讲线对，用于提供关键电话机组之间的相互通信，以及用于通过密钥电话机组中的扬声器电路提供可听信号的信令路径。 通过添加包括第一和第二单向信号路径的混合电路来提供免提对讲功能，用于耦合交流电。 对讲线对和信号线之间的信号。 一个d.c. 控制信号具有第一和第二直流。 响应于第一和第二信号路径中的信号的幅度比大于或小于预定比率，在信令引导上产生信号状态。 扬声器电路各自包括连接到扬声器的接收信号路径。 发射路径和路径切换电路被添加到扬声器电路。 路径切换电路响应于直流的第一和第二状态。 控制信号交替地激活发送和接收信号路径中的一个和另一个，由此提供免提应答对讲功能。