JPS556930A - Hand-free answering system for key telephone system - Google Patents

Hand-free answering system for key telephone system

Info

Publication number
JPS556930A
JPS556930A JP7928278A JP7928278A JPS556930A JP S556930 A JPS556930 A JP S556930A JP 7928278 A JP7928278 A JP 7928278A JP 7928278 A JP7928278 A JP 7928278A JP S556930 A JPS556930 A JP S556930A
Authority
JP
Japan
Prior art keywords
hand
free
circuit
answering
amplifier
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
JP7928278A
Other languages
Japanese (ja)
Other versions
JPS5854713B2 (en
Inventor
Yoichiro Sano
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.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu Electric Co 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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP7928278A priority Critical patent/JPS5854713B2/en
Publication of JPS556930A publication Critical patent/JPS556930A/en
Publication of JPS5854713B2 publication Critical patent/JPS5854713B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems

Landscapes

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

Abstract

PURPOSE:To inform the existence of the hand-free answering function through transmission of the special signals and thus to realize answering suited for the answering function. CONSTITUTION:When the handset of the key telephone set is picked up, extension call current supply circuit NT in main unit EX operates to supply the call current via extension call line TL. At the same time, count development circuit CT is actuated. With dialing circuit CT counts the pulses to then transmit them through the specified terminal. The transmitted (+) potential starts both reception amplifier R-AMP and transmission amplifier T-AMP for hand-free answering use of extension hand-free circuit HF in No.1 telephone TEL incorporating the hand-free answering function. Then the incorporation of circuit HF is detected at hand-free detection control circuit HFK and via the output of amplifier T-AMP.
JP7928278A 1978-06-30 1978-06-30 Hands-free response method in button telephone equipment Expired JPS5854713B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7928278A JPS5854713B2 (en) 1978-06-30 1978-06-30 Hands-free response method in button telephone equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7928278A JPS5854713B2 (en) 1978-06-30 1978-06-30 Hands-free response method in button telephone equipment

Publications (2)

Publication Number Publication Date
JPS556930A true JPS556930A (en) 1980-01-18
JPS5854713B2 JPS5854713B2 (en) 1983-12-06

Family

ID=13685500

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7928278A Expired JPS5854713B2 (en) 1978-06-30 1978-06-30 Hands-free response method in button telephone equipment

Country Status (1)

Country Link
JP (1) JPS5854713B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6159997A (en) * 1984-08-31 1986-03-27 Tamura Electric Works Ltd Extension hand free response system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60163113A (en) * 1984-02-02 1985-08-26 Seiko Instr & Electronics Ltd Constant voltage circuit for mos integrated circuit
JPS6155718A (en) * 1984-08-28 1986-03-20 Fujitsu Ltd Stabilized electric power supply device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6159997A (en) * 1984-08-31 1986-03-27 Tamura Electric Works Ltd Extension hand free response system

Also Published As

Publication number Publication date
JPS5854713B2 (en) 1983-12-06

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