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    • 2. 发明授权
    • Immediate ring-back control system for time-division telephone exchange
    • 用于时分电话交换的即时回铃控制系统
    • US4170718A
    • 1979-10-09
    • US865710
    • 1977-12-29
    • Katsuyuki MiyazakiAkira Horiki
    • Katsuyuki MiyazakiAkira Horiki
    • H04M3/02H04Q11/04H04Q11/06H04J3/12
    • H04M3/02H04Q11/06
    • An immediate ring-back control system in a time-division telephone exchange comprising a time-division switching network of an incoming time switch-space switch-outgoing time switch (T-S-T) system. A continuous ring-back tone is supplied to a plurality of successive addresses of the incoming time switch and an interrupted ring-back tone is supplied to at least one address thereof. Upon connection of the ring-back tone, a first address number of the successive addresses supplied with the continuous ring-back tone is written into a control memory corresponding to the time switch while the successive addresses are sequentially increased for each count of a timing pulse generated periodically. The content of the control memory is modified by the address number successively increased and the successive address numbers are modified to the address number to which the interrupted ring-back tone is supplied, thereby to reduce a post dialling delay.
    • 一种时分电话交换机中的立即回铃控制系统,包括进入时间切换空间切换出局时间切换(T-S-T)系统的时分交换网络。 将连续的回铃音提供给输入时间开关的多个连续的地址,并将中断的回铃音提供给其至少一个地址。 在连接回铃音时,连续回铃音提供的连续地址的第一地址号被写入对应于时间开关的控制存储器中,而对于定时脉冲的每个计数,顺序地增加连续地址 定期生成。 控制存储器的内容被地址号连续增加而修改,并且将连续的地址号修改为提供中断的回铃音的地址号,从而减少后拨号延迟。
    • 4. 发明授权
    • Digital communication system
    • 数字通讯系统
    • US5434886A
    • 1995-07-18
    • US4390
    • 1993-01-14
    • Tohru KazawaTakanori MiyamotoKatsuyuki Miyazaki
    • Tohru KazawaTakanori MiyamotoKatsuyuki Miyazaki
    • H04L25/08H03M13/23H04L25/497H04L5/12
    • H04L25/497H04L1/0043H04L1/0046H04L1/0052H04L1/0054
    • A digital communications system suitable for high-speed data transmission includes a transmitter and a receiver providing the ability to selectively switch between multiple coding and decoding methods. The transmitter includes a plurality of trellis coders, each of which performs a different type of coding on a transmission signal. The receiver includes a plurality of Viterbi decoders, corresponding to the different types of coders in the transmitter, for decoding the transmission signal. The receiver also includes a selector for determining which of the decoder outputs to choose from based on the frequency of code violations detected in the transmission signal. The present invention thus provides a flexible apparatus for improving the quality of high-speed data transmissions.
    • 适用于高速数据传输的数字通信系统包括发射机和接收机,其提供选择性地在多种编码和解码方法之间切换的能力。 发射机包括多个网格编码器,每个网格编码器对传输信号执行不同类型的编码。 接收机包括对应于发射机中的不同类型的编码器的多个维特比解码器,用于解码传输信号。 接收机还包括一个选择器,用于基于在发送信号中检测到的代码违例的频率来确定哪个解码器输出被选择。 因此,本发明提供了一种用于提高高速数据传输质量的灵活装置。