針對煤礦井下調(diào)度及緊急救援系統(tǒng)的需求,以DTMF編解碼模塊為核心,設(shè)計(jì)了具有自動撥號功能的新型電話系統(tǒng)。該系統(tǒng)利用MT8880對DTMF信號的編解碼功能實(shí)現(xiàn)一鍵撥號和遠(yuǎn)程設(shè)置,通過檢測振鈴和忙音信號,完成自動摘機(jī)和掛機(jī)過程,配合AGC等外圍電路達(dá)到話音清晰流暢的效果。
Abstract:
To meet the demand for mine scheduling and emergency rescue system, with using DTMF signal codec as the core, a new telephone system was designed with automatic dialing function. In the system, the DTMF signal encoding and decoding function of MT8880 was used to achieve one-touch dialing and remote setting. The circuit detects the ringing and busy signal, and then completes automatic off-hook and hangup. With AGC(Automatic Gain Control) and other peripheral circuits, the voice was regulated to a clear and smooth effect.