| 摘要 |
<p>1490713 Testing pulse regenerators SIEMENS AG 14 Oct 1974 [22 Nov 1973] 44364/74 Heading H4R In a P.C.M. communication system with means for testing pulse regenerators in intermediate stations, as disclosed in Specifications 1,212,907 and 1,212,908, the switch 12 which is actuated when the testing procedure is initiated comprises a first switch amplifier device 31 with a frequency dependent feedback network 44 and a second switch device 30 constituted by a two-stage transistor switch. The regenerators in one of the transmission paths are also provided with respective active pre-adjusted fixed value signal distortion correctors comprising a transistor amplifier stage with a frequency dependent negative feedback path (33), Fig. 5 (not shown).</p> |
