发明授权
US4691337A Method and apparatus for determining the value of analog voltages
occurring on telephone subscriber lines of a digital telephone exchange
失效
用于确定在数字电话交换机的电话用户线上出现的模拟电压的值的方法和装置
- 专利标题： Method and apparatus for determining the value of analog voltages occurring on telephone subscriber lines of a digital telephone exchange
- 专利标题（中）： 用于确定在数字电话交换机的电话用户线上出现的模拟电压的值的方法和装置
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申请号： US849653申请日： 1986-04-09
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公开(公告)号： US4691337A公开(公告)日： 1987-09-01
- 发明人: Gabriele Held-Elbert , Wolfgang Kaiser , Werner Schmutzler
- 申请人： Gabriele Held-Elbert , Wolfgang Kaiser , Werner Schmutzler
- 申请人地址： DEX Berlin and Munich
- 专利权人： Siemens Aktiengesellschaft
- 当前专利权人： Siemens Aktiengesellschaft
- 当前专利权人地址： DEX Berlin and Munich
- 优先权： DEX3515613 19850430
- 主分类号： H04M3/30
- IPC分类号： H04M3/30 ; H04Q11/04 ; H04B3/46
摘要：
Analog voltages are collected by scanning the two wires of a subscriber line; the values are subjected to an analog-digital conversion and fed to a microprocessor (MC) which computes the desired measuring values from the results of said conversion. Thus, from a single measuring operation performed at two measuring points, nine different voltage values can thus be obtained including dc, ac and external voltages between each wire and ground and between the two wires.
公开/授权文献
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