Title:
呼出信号発生装置
Document Type and Number:
Japanese Patent JP5561772
Kind Code:
B2
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.
Inventors:
Takuma Aoshima
Application Number:
JP2010126383A
Publication Date:
July 30, 2014
Filing Date:
June 02, 2010
Export Citation:
Assignee:
NEC Access Technica Co., Ltd.
International Classes:
H04M3/02; H04M19/02
Domestic Patent References:
| JP55075368A | ||||
| JP2257744A | ||||
| JP3175768A | ||||
| JP2004166099A | ||||
| JP64085471A |
Attorney, Agent or Firm:
Ken Ieiri