发明授权
- 专利标题： Energy detection circuit for a facsimile system controller
- 专利标题（中）： 用于传真系统控制器的能量检测电路
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申请号： US613341申请日： 1984-05-23
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公开(公告)号： US4567328A公开(公告)日： 1986-01-28
- 发明人: Francis P. Carrasco , Gerard A. DeRome , David W. Fernekes
- 申请人： Francis P. Carrasco , Gerard A. DeRome , David W. Fernekes
- 申请人地址： MI Detroit
- 专利权人： Burroughs Corp.
- 当前专利权人： Burroughs Corp.
- 当前专利权人地址： MI Detroit
- 主分类号： H04M11/06
- IPC分类号： H04M11/06 ; H04M11/00 ; H04N1/00 ; H04N1/40 ; 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.
公开/授权文献
- US4021631A Electrical header device 公开/授权日：1977-05-03
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