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    • 5. 发明授权
    • Time division switching system
    • 时分切换系统
    • US4633460A
    • 1986-12-30
    • US676406
    • 1984-11-29
    • Taihei SuzukiTakashi MoritaHirotoshi ShirasuHiroshi KuwaharaEiichi Amada
    • Taihei SuzukiTakashi MoritaHirotoshi ShirasuHiroshi KuwaharaEiichi Amada
    • H04Q11/04
    • H04Q11/04
    • This invention relates to a time division switching system for exchanging audio signals, data and so on in a time division manner. This time division switchboard comprises a plurality of separate local exchange units capable of interfacing with various different circuits such as subscriber lines, trunk lines, service circuits and so on, one or a plurality of junctor high ways connected to a time switch of each of the local exchange units, and one or a plurality of tandem exchange units each having a time switch connected to the other ends of the junctor high ways and switching by the time switch. Each of the local exchange units selects a channel on an arbitrary junctor high way and transmits control information concerning other one of the local exchange units to which a calling is to be sent, to one of the tandem exchange units which has the selected junctor high way connected thereto. The tandem exchange unit to which the control information is sent selects a channel on a junctor high way connected to the local exchange unit to which the call is to be sent, in response to the control information sent thereto, thereby switching the calling to the desired local exchange unit. Thus, since the respective units can be loosely coupled to each other, the time division switching system of this invention has high reliability and good economy.
    • 本发明涉及一种用于以时分方式交换音频信号,数据等的时分切换系统。 该时分交换机包括能够与诸如用户线路,中继线路,业务电路等各种不同的电路接口的多个单独的本地交换单元,一个或多个连接到每个的时间交换机 本地交换单元,以及一个或多个串联交换单元,每个交换单元具有连接到连接器高通路的另一端的时间开关并且通过时间切换切换。 每个本地交换单元在任意的高级路由上选择一个信道,并将与要发送呼叫的其他一个本地交换单元相关的控制信息发送到具有所选择的高级路由的汇接交换单元之一 与其连接。 发送控制信息的串联交换单元响应于发送给控制信息的控制信息而选择连接到要发送呼叫的本地交换单元的连接器高速路上的信道,从而将呼叫切换到期望的 本地交换单位。 因此,由于各单元可以彼此松耦合,本发明的时分交换系统具有高可靠性和良好的经济性。
    • 6. 发明授权
    • Subscriber line interface circuit with complex impedance
    • 用户线接口电路具有复阻抗
    • US4558185A
    • 1985-12-10
    • US445976
    • 1982-12-01
    • Yuichi MorikawaKazuo SaitoEiichi AmadaHirotoshi Shirasu
    • Yuichi MorikawaKazuo SaitoEiichi AmadaHirotoshi Shirasu
    • H04B3/03H04B1/58H04M1/58H04Q3/42
    • H04M1/585H04B1/586
    • For the purpose of realizing a line circuit, especially a two-wire four-wire conversion circuit of a telephone exchange in the form of LSI and providing the conversion circuit with an impedance which is suitable to a side tone characteristic of the telephone set, in a line circuit composed of a hybrid circuit wherein the four-wire input line is connected to the two-wire subscriber line via a buffer amplifier and a terminating impedance and in addition the four-wire output line is connected to the output of a subtractor which subtracts an input signal of the four-wire input line passed through a filter circuit from a signal fed from the two-wire subscriber line, the terminating impedance is formed by a resistor component and in addition a feedback circuit having such a transfer characteristic that the impedance of the line circuit seen from the two-wire subscriber line side will become a specified complex impedance is installed between a line which couples the two-wire subscriber line to the subtractor and an input of the buffer amplifier.
    • 为了实现线路电路,特别是LSI形式的电话交换机的二线四线转换电路,为转换电路提供适合于电话机侧音特性的阻抗, 由混合电路构成的线路电路,其中四线输入线经由缓冲放大器与终端阻抗连接到两线用户线,此外四线输出线连接到减法器的输出, 从通过二线用户线的信号中减去通过滤波器电路的四线输入线的输入信号,终端阻抗由电阻器部件形成,此外,具有这样的转移特性的反馈电路, 从两线用户线路侧看到的线路电路的阻抗将变为指定的复阻抗,安装在耦合两线用户线路t的线路之间 减法器和缓冲放大器的输入。
    • 8. 发明授权
    • Broadcast information delivering system
    • 广播信息传递系统
    • US06256509B1
    • 2001-07-03
    • US09268649
    • 1999-03-16
    • Satoshi TanakaEiichi AmadaSeiki Mizutani
    • Satoshi TanakaEiichi AmadaSeiki Mizutani
    • H04B7005
    • H04W72/005H04L1/0066H04L1/0071H04W88/08
    • A broadcast information delivering system which includes a plurality of wireless terminals and a wireless base station having a transmitter for transmitting broadcast control information to a control channel, and a transmitter for transmitting a broadcast frame to a broadcast channel in accordance with a transmission condition defined in the broadcast control information. The broadcast frame includes a plurality of sub-frames containing different contents information to each other and a frame header including guidance information of the contents information. Each of the wireless terminals includes a receiver for receiving the control information from the control channel, and a receiver for receiving the broadcast frame from the broadcast channel based on the broadcast control information and selectively receiving the contents information in a specific one of said sub-frames in accordance with the guidance information of the broadcast frame.
    • 一种包括多个无线终端的广播信息传送系统和具有用于向控制信道发送广播控制信息的发射机的无线基站,以及根据定义的传输条件向广播信道发送广播帧的发射机 广播控制信息。 广播帧包括彼此不同的内容信息的多个子帧以及包含内容信息的引导信息的帧头。 每个无线终端包括用于从控制信道接收控制信息的接收机和用于基于广播控制信息从广播信道接收广播帧的接收机,并且选择性地接收所述子频道中的特定一个中的内容信息, 根据广播帧的指导信息进行帧。