RING CIRCUIT FOR DAMA-SCPC

摘要

The ring signal circuit according to the present invention includes a PCM ROM 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 922; An amplifier 24 which amplifies the output of the buffer circuit 23 and outputs a ring signal of a predetermined standard; And the boost transformer is easy to change the frequency of the ring signal, the ring signal amplifier can be implemented as a simple circuit using the associative amplifier.