Invention Grant
- Patent Title: Call signal generating device
- Patent Title (中): 呼叫信号发生装置
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Application No.: US13103898Application Date: 2011-05-09
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Publication No.: US08666060B2Publication Date: 2014-03-04
- Inventor: Takuma Aoshima
- Applicant: Takuma Aoshima
- Applicant Address: JP Shizuoka
- Assignee: NEC Access Technica Ltd
- Current Assignee: NEC Access Technica Ltd
- Current Assignee Address: JP Shizuoka
- Agency: Sughrue Mion, PLLC
- Priority: JP2010-126383 20100602
- Main IPC: H04M3/00
- IPC: H04M3/00 ; G08B3/10
Abstract:
A call signal generating device, whose pair of output terminals is connected to a telephone set, includes a rectifier rectifying an inputted high frequency signal and maintaining an output polarity in one of two polarities; and a polarity reverser generating a call signal by periodically reversing the output polarity of the rectifier and supplying it to the telephone set via the pair of output terminals.
Public/Granted literature
- US20110299677A1 CALL SIGNAL GENERATING DEVICE Public/Granted day:2011-12-08
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