JPS6489650A - Interphone system - Google Patents

Interphone system

Info

Publication number
JPS6489650A
JPS6489650A JP24385687A JP24385687A JPS6489650A JP S6489650 A JPS6489650 A JP S6489650A JP 24385687 A JP24385687 A JP 24385687A JP 24385687 A JP24385687 A JP 24385687A JP S6489650 A JPS6489650 A JP S6489650A
Authority
JP
Japan
Prior art keywords
circuit
tone
turned
calling
inputted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP24385687A
Other languages
English (en)
Inventor
Mitsuhiro Matsuda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Electric Equipment Corp
Original Assignee
Toshiba Electric Equipment Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Electric Equipment Corp filed Critical Toshiba Electric Equipment Corp
Priority to JP24385687A priority Critical patent/JPS6489650A/ja
Publication of JPS6489650A publication Critical patent/JPS6489650A/ja
Pending legal-status Critical Current

Links

Landscapes

  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
JP24385687A 1987-09-30 1987-09-30 Interphone system Pending JPS6489650A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24385687A JPS6489650A (en) 1987-09-30 1987-09-30 Interphone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24385687A JPS6489650A (en) 1987-09-30 1987-09-30 Interphone system

Publications (1)

Publication Number Publication Date
JPS6489650A true JPS6489650A (en) 1989-04-04

Family

ID=17109978

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24385687A Pending JPS6489650A (en) 1987-09-30 1987-09-30 Interphone system

Country Status (1)

Country Link
JP (1) JPS6489650A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2192129A1 (es) * 2001-05-18 2003-09-16 Alcad Sa Sistema de deteccion y generacion de llamada a viviendas para porteros electronicos.
WO2012096027A1 (ja) * 2011-01-14 2012-07-19 Ｎｅｃインフロンティア株式会社 インタフェース回路及び主装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2192129A1 (es) * 2001-05-18 2003-09-16 Alcad Sa Sistema de deteccion y generacion de llamada a viviendas para porteros electronicos.
WO2012096027A1 (ja) * 2011-01-14 2012-07-19 Ｎｅｃインフロンティア株式会社 インタフェース回路及び主装置
US8718274B2 (en) 2011-01-14 2014-05-06 Nec Infrontia Corporation Interface circuit and main device

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