Automatic compensation circuit and method
    1.
    发明授权
    Automatic compensation circuit and method 失效
    自动补偿电路及方法

    公开(公告)号:US4407020A

    公开(公告)日:1983-09-27

    申请号:US180530

    申请日:1980-08-25

    IPC分类号: H04J3/10

    CPC分类号: H04J3/10

    摘要: An automatic compensation circuit for use in a digital switching system. The circuit provides automatic compensation for each incoming channel of a pulse amplitude modulated (PAM) input signal. The circuit generates a compensation data word corresponding to the sign of each sample of the input PAM signal and increments or decrements the compensation word depending upon the sign of the previously sampled PAM signal for each channel, thereby providing automatic compensation dependent upon the value of the adjusted data word.

    摘要翻译: 一种用于数字交换系统的自动补偿电路。 电路为脉冲幅度调制(PAM)输入信号的每个输入通道提供自动补偿。 电路产生对应于输入PAM信号的每个样本的符号的补偿数据字,并根据每个通道的先前采样的PAM信号的符号递增或递减补偿字,从而根据 调整后的数据字。

    Integrated telephone transmission and switching system
    2.
    发明授权
    Integrated telephone transmission and switching system 失效
    综合电话传输和交换系统

    公开(公告)号:US4288870A

    公开(公告)日:1981-09-08

    申请号:US874521

    申请日:1978-02-02

    IPC分类号: H04Q11/06 H04J3/00

    CPC分类号: H04Q11/06

    摘要: An integrated telephone transmission and switching system operating in a multiframe format where each frame consists of a plurality of time slots and includes a base switch connected to a plurality of multitime slots data buses where the base switch operates to switch encoded data between any specified time slots on any of the buses. A subscriber switch is connected between a plurality of subscriber lines and to a pair of multitime-slot data buses and operates to connect and concentrate the local subscriber lines to the specified time slots on the pair of data buses, thereby enabling connections between a local subscriber line and any other subscriber line connected to the system.

    摘要翻译: 一种以多帧格式工作的集成电话传输和交换系统,其中每个帧由多个时隙组成,并且包括连接到多个多时隙数据总线的基本交换机,其中基本交换机操作以在任何指定的时隙之间切换编码数据 在任何一辆巴士上。 用户交换机连接在多个用户线路和一对多时隙数据总线之间,并且操作以将本地用户线路连接并集中到该对数据总线上的指定时隙,从而实现本地用户 线路和连接到系统的任何其他用户线路。

    Multifrequency sender/receiver in a multi-time slot digital data stream
    3.
    发明授权
    Multifrequency sender/receiver in a multi-time slot digital data stream 失效
    在多时隙数字数据流中的多频发送器/接收器

    公开(公告)号:US4133979A

    公开(公告)日:1979-01-09

    申请号:US762809

    申请日:1977-01-26

    IPC分类号: H04J3/12 H04Q1/457

    CPC分类号: H04J3/12 H04Q1/4575

    摘要: A multifrequency sender/receiver in a telephone system operating in time frames each including a plurality of time slots, including a sender for generating and connecting selected multifrequency tone signals in pulse code modulated format to a first group of the time slots. The receiver is responsive to the presence of a multifrequency tone in a second group of the time slots and provides a data signal representative of the tone signal present. Control means specify the selected tone signals to be sent in the first group of time slots.

    摘要翻译: 一种电话系统中的多频发送器/接收器,每个时隙包括多个时隙,包括发送器,用于以脉冲编码调制格式生成和连接所选择的多频音频信号到第一组时隙。 接收机响应于在时隙的第二组中存在多频调,并且提供表示存在的音调信号的数据信号。 控制装置指定要在第一组时隙中发送的所选音调信号。

    Subscriber terminal for use in a TDM switching system
    4.
    发明授权
    Subscriber terminal for use in a TDM switching system 失效
    用户终端用在TDM交换系统

    公开(公告)号:US4178478A

    公开(公告)日:1979-12-11

    申请号:US875493

    申请日:1978-02-06

    IPC分类号: H04Q11/04

    CPC分类号: H04Q11/04

    摘要: A subscriber termnal for use in a TDM telephone system operating in a multiframe format where each time frame consists of a plurality of time slots, said system including a base switch connected to a plurality of multitime slot data buses for switching encoded data between specified ones of the time slots. A subscriber switch is connected to a plurality of local subscriber lines and to a pair of the data buses for switching encoded data between the subscriber lines and specified time slots on the pair of data buses. The subscriber switch includes a number of subscriber terminals where each terminal is connected to some of the subscriber lines and includes a pair of subscriber switch controllers for controlling the switching of data between the subscriber lines and the pair of buses. Each subscriber terminal provides the capability of encoding, multiplexing and switching data from a plurality of subscriber lines to specified time slots on the pair of multitime slot buses and capability of decoding, demultiplexing and switching other encoded data from specified time slots on the pair of data buses to the subscriber lines.

    摘要翻译: 用于在多帧格式,其中每个时帧包括多个时隙中的操作的TDM电话系统中,使用的订户termnal所述系统包括连接到多个多时时隙数据总线对中的指定之间切换编码数据的基础开关 时隙。 订户开关被连接到多个本地用户线和一对数据总线的用于切换在一对数据总线的用户线和指定的时隙之间的编码数据。 订户交换机包括多个其中每个端子连接到一些用户线,并且包括用于控制用户线路和一对总线之间的数据交换的一对订户交换机控制器的用户终端。 每个用户终端提供的编码,多路复用和交换数据从多条用户线的能力,以指定的时隙上的一对多时插槽总线和解码,解复用的能力,并从指定的时隙上的一对数据的切换其他的编码数据的 公共汽车到用户线。