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    Digital telephone apparatus
    1.
    发明授权
    Digital telephone apparatus 失效
    数字电话机

    公开(公告)号：US4389544A

    公开(公告)日：1983-06-21

    申请号：US249400

    申请日：1981-03-31

    申请人： Theodore W. Wagner ,  Sam Liang ,  Deepak R. Muzumdar

    发明人： Theodore W. Wagner ,  Sam Liang ,  Deepak R. Muzumdar

    IPC分类号： H04M1/253 ,  H04Q11/04 ,  H04M11/06 ,  H04J3/06

    CPC分类号： H04M1/253 ,  H04Q11/04

    摘要： Digital telephone apparatus suitable for use as a subscriber station as well as for an attendant console. The telephone apparatus is connectable for full duplex communication with a four wire telephone transmission line. The telephone apparatus is capable of transmitting PCM speech data and/or digital data from a digital data interface to a peripheral data system. The telephone apparatus comprises an internal data bus to which are connected a digital transceiver, a sync/signalling generator, a serial frame synchronizer and at least one codec/PCM filter. The transceiver transmits and receives digital data to and from the telephone transmission line. The sync/signalling generator repeatedly supplies an 8 bit first data word to the internal data bus containing a binary synchronizing code and a signalling code. Simultaneously, the serial frame synchronizer repeatedly receives from the data bus and decodes an 8 bit first data word containing a synchronizing code and a signalling code. The codec/PCM filter repeatedly receives from and transmits to said internal data bus 8 bit PCM voice samples as additional data words immediately following the first data word. A microcomputer, including a number of input/output devices, receives successive signalling codes from the serial frame synchronizer and repeatedly transmits signalling codes to the sync/signalling generator for communicating with the telephone exchange to which the apparatus is connected.

    摘要翻译： 数字电话设备适合用作用户台以及话务台。 电话设备可连接四线电话传输线进行全双工通信。 电话设备能够将PCM语音数据和/或数字数据从数字数据接口传送到外围数据系统。 电话设备包括连接数字收发器，同步信号发生器，串行帧同步器和至少一个编解码器/ PCM滤波器的内部数据总线。 收发器向和从电话传输线路发送和接收数字数据。 同步/信令发生器重复地将8位第一数据字提供到包含二进制同步码和信令码的内部数据总线。 同时，串行帧同步器从数据总线反复接收并解码包含同步码和信令码的8位第一数据字。 编解码器/ PCM滤波器重复接收并发送到所述内部数据总线8位PCM语音样本作为紧跟在第一数据字之后的附加数据字。 包括多个输入/输出设备的微型计算机从串行帧同步器接收连续的信令代码，并重复发送信号代码给同步信号发生器，以便与设备所连接的电话交换机进行通信。