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1. 发明授权

US4670901A Single or multi-stage switching field for telephone exchanges 失效
标题翻译：电话交换机的单级或多级交换领域
公开(公告)号：US4670901A
公开(公告)日：1987-06-02
申请号：US818990
申请日：1986-01-10
申请人： Attila Nemeth , Gyula Dolozselek , Laszlo Mikics , Bela Molnar , Mihaly Sallai , Sandor Liska , Gyula Speck
发明人： Attila Nemeth , Gyula Dolozselek , Laszlo Mikics , Bela Molnar , Mihaly Sallai , Sandor Liska , Gyula Speck
IPC分类号： H04Q3/68 , H04Q3/52
CPC分类号： H04Q3/68
摘要： A multi-stage switching-field formed with switching matrices containing thyristors for stored program controlled switching devices, established by reversal at the last stage, without the use of transformers or other reactive elements therein (e.g. capacitance), in the last stage a holding circuit remains invariable upon switching on, furthermore allocating and switching circuits are ordered to the coupling paths instead of the stages. Circuit arrangements of the switching-field provide the possibility for attenuation control too, and do not require voltages of opposite polarity, while at the same time provide an interface requiring uniform, short operations towards the stored program control device. The switching matrices are switched on at minimal power-level, thus the switching of each further coupling path or connection does not increase the noise level of the already existing connections. The switching-field provides effective protection against unwarranted disconnections caused by noise arriving from the lines, and ensures through impedance matching to attain the optimal ratios of the insertion loss, dynamic range of the connections, and cross-talk attenuation between the different connections. The circuits developed for the switching-field according to the invention are suitable also for production with hydrid or monolithic technology.
摘要翻译：一种多级开关场，形成有包含用于存储程序控制的开关装置的晶闸管的开关矩阵，其通过在最后阶段反转而不在其中使用变压器或其它无功元件建立（例如，电容），在最后阶段中保持电路在接通时保持不变，此外分配和切换电路被排序到耦合路径而不是阶段。开关电路的电路布置也提供衰减控制的可能性，并且不需要相反极性的电压，同时提供对存储的程序控制装置需要均匀的短操作的接口。开关矩阵以最小功率电平接通，因此每个另外的耦合路径或连接的切换不会增加现有连接的噪声水平。开关场提供有效保护，防止由线路噪声引起的无理断开，并通过阻抗匹配确保插入损耗，连接的动态范围和不同连接之间的串扰衰减的最佳比例。根据本发明开发的用于开关场的电路也适用于采用氢化或单片技术的生产。

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