JPS5271905A - Telephone set calling system - Google Patents

Telephone set calling system

Info

Publication number
JPS5271905A
JPS5271905A JP14729075A JP14729075A JPS5271905A JP S5271905 A JPS5271905 A JP S5271905A JP 14729075 A JP14729075 A JP 14729075A JP 14729075 A JP14729075 A JP 14729075A JP S5271905 A JPS5271905 A JP S5271905A
Authority
JP
Japan
Prior art keywords
telephone set
calling system
call
set calling
tone
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.)
Granted
Application number
JP14729075A
Other languages
Japanese (ja)
Other versions
JPS5433924B2 (en
Inventor
Seiji Sasaki
Akio Oki
Isao Wakamatsu
Masayoshi Oshima
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.)
TAIKOU DENKI SEISAKUSHIYO KK
Oki Electric Industry Co Ltd
Taiko Electric Works Ltd
Original Assignee
TAIKOU DENKI SEISAKUSHIYO KK
Oki Electric Industry Co Ltd
Taiko Electric Works Ltd
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 TAIKOU DENKI SEISAKUSHIYO KK, Oki Electric Industry Co Ltd, Taiko Electric Works Ltd filed Critical TAIKOU DENKI SEISAKUSHIYO KK
Priority to JP14729075A priority Critical patent/JPS5271905A/en
Publication of JPS5271905A publication Critical patent/JPS5271905A/en
Publication of JPS5433924B2 publication Critical patent/JPS5433924B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/82—Line monitoring circuits for call progress or status discrimination

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To secure the recognizability of internal call signal tone with a simple circuit composition, by obstructing the exchange call siganl tone when both signal tones of exchange call and internal call are overlapped in time.
JP14729075A 1975-12-12 1975-12-12 Telephone set calling system Granted JPS5271905A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14729075A JPS5271905A (en) 1975-12-12 1975-12-12 Telephone set calling system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14729075A JPS5271905A (en) 1975-12-12 1975-12-12 Telephone set calling system

Publications (2)

Publication Number Publication Date
JPS5271905A true JPS5271905A (en) 1977-06-15
JPS5433924B2 JPS5433924B2 (en) 1979-10-24

Family

ID=15426851

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14729075A Granted JPS5271905A (en) 1975-12-12 1975-12-12 Telephone set calling system

Country Status (1)

Country Link
JP (1) JPS5271905A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4510407Y1 (en) * 1969-07-28 1970-05-13

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4510407Y1 (en) * 1969-07-28 1970-05-13

Also Published As

Publication number Publication date
JPS5433924B2 (en) 1979-10-24

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