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公开(公告)号：US4514597A
公开(公告)日：1985-04-30
申请号：US494189
申请日：1983-05-13
CPC分类号： H04M9/003
摘要： In a signal transmission system of a key telephone system of the type comprising a main device connected to office lines and having an input/output port for transmitting and receiving signals, and a plurality of key telephone sets connected in parallel to the main device through a pair of signal lines for transmitting and receiving various control signals between the main device and the key telephone sets, wherein each of the control signals is constituted by a pulse width modulated time series signal of a predetermined number of bits, respective control signals are inputted and outputted in parallel to and from a bit input/output of the input/output port and wherein transmission and reception of the control signals between the main device and respective key telephone sets are simultaneously performed by parallel input/output operations of the calculating processing unit.
摘要翻译： 在包括连接到办公室线路并具有用于发送和接收信号的输入/输出端口的主设备的类型的钥匙电话系统的信号传输系统中，以及多个按键电话机通过一个 一对信号线，用于在主设备和密钥电话机之间发送和接收各种控制信号，其中每个控制信号由预定位数的脉宽调制时间序列信号构成，各个控制信号被输入， 与输入/输出端口的位输入/输出并行输出，并且其中通过计算处理单元的并行输入/输出操作同时执行主设备和各个密钥电话机之间的控制信号的发送和接收。
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公开(公告)号：US4572928A
公开(公告)日：1986-02-25
申请号：US550236
申请日：1983-11-08
申请人： Tomio Nishimura , Junzo Kikuchi , Ryuzo Sugiura , Toshiro Yoshida
发明人： Tomio Nishimura , Junzo Kikuchi , Ryuzo Sugiura , Toshiro Yoshida
CPC分类号： H04M9/005
摘要： In a key telephone system with a plurality of four-wire key telephone sets wherein a two-wire telephone set is connected to a main control device via a pair of speech lines so that intercom speech and office line speech are possible between the two-wire telephone set and other key telephone sets, the improvement wherein said main control device comprises a call signal generating circuit, first transfer switching means for transfer-connecting said speech lines between a pair of office speech lines and a pair of intercom speech lines, second transfer switching means for transfer-connecting said speech lines between said call signal generating circuit and said first transfer switching means, DC loop supervisory means for supervising a DC loop of said speech lines, and a control circuit inputted with an output of said DC loop supervisory means for controlling said first and second transfer switching means in accordance with the states of said office lines. Under a normal state the speech lines are connected to the intercom speech lines through the first and second transfer switching means. At the time of arrival of an office line call signal the second transfer switching means is switched to send the call signal to the speech lines. Thereafter the second transfer switching means is reset and the first transfer switching means is switched to the office line speech lines in accordance with the output of the loop supervisory means.
摘要翻译： 在具有多个四线密钥电话机的密钥电话系统中，其中两线电话机经由一对语音线路连接到主控制装置，使得双线电话机之间可以进行对讲语音和办公线路语音 电话机和其他关键电话机，其中所述主控装置包括呼叫信号发生电路，第一传送切换装置，用于在一对办公语音线和一对对讲话音线之间传送连接所述语音线，第二传送 用于在所述呼叫信号发生电路和所述第一传送切换装置之间传送连接所述语音线路的切换装置，用于监视所述语音线路的DC环路的DC环路监控装置，以及输入所述DC循环监视装置的输出的控制电路 用于根据所述办公用线的状态来控制所述第一和第二传送切换装置。 在正常状态下，语音线路通过第一和第二传送切换装置连接到对讲语音线路。 在办公室呼叫信号到达时，切换第二传送切换装置以将呼叫信号发送到语音线路。 此后，第二传送切换装置被复位，并且第一传送切换装置根据环路监控装置的输出被切换到办公室线路语音线路。
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公开(公告)号：US4754477A
公开(公告)日：1988-06-28
申请号：US828284
申请日：1986-02-11
申请人： Kouji Tanaka , Yoshihiro Ikeda , Ryuzo Sugiura , Junzo Kikuchi , Hikaru Sano
发明人： Kouji Tanaka , Yoshihiro Ikeda , Ryuzo Sugiura , Junzo Kikuchi , Hikaru Sano
CPC分类号： H04L25/065 , H04L25/063 , H04M9/003
摘要： There is disclosed a data transmitting and receiving circuit extremely advantageous when applied to a key telephone system. The data transmitting circuit comprises a voltage dividing circuit for dividing a power supply voltage to apply the divided voltage to one end of a primary winding of a transformer, and a driver circuit comprising a pair of transistors connected in series between the power supply and a common potential terminal, the node of the transistors being connected to the other end of the primary winding of the transformer. When data signal is transmitted, the data transmitting circuit is operative to complementarily turn and off the pair of transistors in accordance with the data signal. In contrast, when data is not transmitted, the data transmitting circuit is operative to cut off both the transistors. Thus, the data transmitting circuit can eliminate the possibility that a DC voltage on which a data signal to be transmitted is superimposed undesirably changes. Further, the data receiving circuit comprises a voltage divider common to the above-mentioned voltage dividing circuit, a comparator having a comparison input connected to the other end of the secondary winding of the transformer, and a reference voltage supply circuit for selecting either of two reference voltages depending upon a binary output level of the comparator to deliver the selected one to the reference input of the comparator. Thus, the data receiving circuit can provide a stable and steady receiving condition when a data signal superimposed on a DC voltage is received to change the data signal into a binary received signal.
摘要翻译： 公开了一种在应用于密钥电话系统时非常有利的数据发送和接收电路。 数据发送电路包括：分压电路，用于分压电源电压以将分压电压施加到变压器的初级绕组的一端;以及驱动器电路，包括串联连接在电源和公共端之间的一对晶体管 电位端子，晶体管的节点连接到变压器初级绕组的另一端。 当发送数据信号时，数据发送电路可根据该数据信号互补地对和关掉一对晶体管。 相反，当不发送数据时，数据发送电路可操作地切断两个晶体管。 因此，数据发送电路可以消除其上叠加有数据信号的直流电压被不期望地改变的可能性。 此外，数据接收电路包括与上述分压电路相同的分压器，具有与变压器的次级绕组的另一端连接的比较输入的比较器和用于选择两个 参考电压取决于比较器的二进制输出电平，以将所选择的电平输出到比较器的参考输入端。 因此，当接收叠加在DC电压上的数据信号以将数据信号改变为二进制接收信号时，数据接收电路可以提供稳定和稳定的接收条件。
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公开(公告)号：US4383137A
公开(公告)日：1983-05-10
申请号：US162568
申请日：1980-06-24
CPC分类号： H04M9/007
摘要： A key telephone exchange system comprises office line units connected to office lines, terminal units respectively connected to key telephone sets and a main control unit for changing connections between respective office line units and respective terminal units. Each office line unit comprises a first memory device to store data transmitted between the office line unit and an office line, and a first processor for writing and reading data into and out of the first memory device for controlling origination and call requests to and from the office line. Each terminal unit comprises a second memory device adapted to store data transmitted between a terminal unit and a key telephone set, and a second processor for writing and reading data into and out of the second memory device for controlling transmission of data between a terminal unit and a corresponding key telephone set. The main control unit comprises a third memory device for storing states of use of the terminal unit and of the office line unit, and a third processor which sequentially scans data in the first and second memory devices of the terminal unit and of the office line unit and for exchanging connections between the terminal units and the office line units according to data obtained as a result of the scanning.
摘要翻译： 主要电话交换系统包括连接到办公室线路的办公室单元，分别连接到键盘电话机的终端单元和用于改变各个办公室线路单元与各个终端单元之间的连接的主控制单元。 每个办公线路单元包括用于存储在办公室线路单元和办公室线路之间传输的数据的第一存储器设备和用于将数据写入和读出到第一存储器设备中以用于控制来自和来自第一存储器设备的发起和呼叫请求的第一处理器 办公线 每个终端单元包括适于存储在终端单元和密钥电话机之间传输的数据的第二存储器件，以及用于将数据写入和读出第二存储器件的第二处理器，用于控制终端单元和 相应的钥匙电话机。 主控制单元包括用于存储终端单元和办公室单元的使用状态的第三存储装置，以及顺序地扫描终端单元和办公室单元的第一和第二存储装置中的数据的第三处理器 并且根据作为扫描结果获得的数据来交换终端单元和办公室线路单元之间的连接。
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