A ring circuit for DAMA-SCPC

摘要

The ring signal circuit according to the present invention includes a PCM (21) for outputting a stored digital call tone according to a control signal of a system processor; A digital-to-analog converter 22 for converting the digital signal stored in the PCM ROM 21 into an analog signal; A buffer circuit 23 for buffering the output of the digital analog converter 22; An amplifier 24 for amplifying the output of the buffer circuit 23 and outputting a ring signal having a predetermined standard. Can be implemented.