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公开(公告)号:US4567328A
公开(公告)日:1986-01-28
申请号:US613341
申请日:1984-05-23
CPC分类号: H04Q1/446
摘要: Disclosed is an energy detection circuit for use in a facsimile system autodialer/controller. The circuit monitors a telephone line and nulls out transmit tones leaving only receive signals. The analog receive signals are processed to produce a digital signal indicating the on-off times of receive energy on the telephone line. The energy on-off times may then be evaluated by a microprocessor included in the facsimile system autodialer/controller to determine whether a dial tone, busy signal or ring back is being received.
摘要翻译: 公开了一种用于传真机系统自动拨号/控制器的能量检测电路。 该电路监视一条电话线,并且将输出信号置零,仅留下接收信号。 处理模拟接收信号以产生指示电话线上的接收能量的开 - 关时间的数字信号。 然后可以通过传真机系统自动拨号器/控制器中包括的微处理器来评估能量开关时间,以确定是否正在接收拨号音,忙信号或回铃。