AN ANNOUNCEMENT SYSTEM WITH DIGITAL SIGNAL IN ELECTRONIC SWITCHING SYSTEMS

摘要

The apparatus includes a central processing and audio storing section (110), a function selecting and controlling section (120), an audio input/output matching section (130), and a testing and warning section (140). The section (110) is connected to both the matching section (130) and the section (120) in such a manner as to control them (120)(130). The (120) is connected to the matching section (130) to control it. The testing and warning section (140) is connected to both the matching section (130) and the feature selecting and controlling section (120) to receive warning signals from the sections.