发明名称 Telephone answering system with ring detector
摘要 A telephone answering system is provided which includes an automatic ring delay circuit which sets the system so that the first call received after the system has been turned on requires four rings, for example, to activate the system, and all subsequent calls require but two rings, for example. The telephone answering system also includes an oscillator circuit which is momentarily energized at the end of an announcement interval so as to generate a beep signal to the calling party to notify the calling party that the system is now in condition to record his message.
申请公布号 US3979560(A) 申请公布日期 1976.09.07
申请号 US19750556649 申请日期 1975.03.10
申请人 T.A.D. AVANTI, INC. 发明人 DARWOOD, JAMES R.
分类号 H04M1/654;(IPC1-7):H04M11/10 主分类号 H04M1/654
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