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公开(公告)号:US4584576A
公开(公告)日:1986-04-22
申请号:US545793
申请日:1983-10-26
申请人: Alain Forestier , Philippe Fenaux
发明人: Alain Forestier , Philippe Fenaux
CPC分类号: H04M19/02
摘要: D.C.-fed ringing signal generator for a group of subscriber lines comprises a cascade arrangement of a digital signal generator controllable by a control signal to produce a signal corresponding either to the ringing signal or to a signal having zero value,a digital-to-analog converter,a capacitively-coupled class-A amplifier, anda direct-coupled class-B symmetrical power amplifier to produce the output signal of the ringing signal generator.
摘要翻译: 用于一组用户线路的DC馈电振铃信号发生器包括由控制信号控制的数字信号发生器的级联布置,以产生对应于振铃信号或与零值的信号相对应的信号,数模转换器 转换器,电容耦合的A类放大器和直接耦合的B类对称功率放大器,以产生振铃信号发生器的输出信号。