JPS5636256A - Tone ringer transmission circuit - Google Patents

Tone ringer transmission circuit

Info

Publication number
JPS5636256A
JPS5636256A JP11136679A JP11136679A JPS5636256A JP S5636256 A JPS5636256 A JP S5636256A JP 11136679 A JP11136679 A JP 11136679A JP 11136679 A JP11136679 A JP 11136679A JP S5636256 A JPS5636256 A JP S5636256A
Authority
JP
Japan
Prior art keywords
transformer
audible signal
winding
telephone set
signal source
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
JP11136679A
Other languages
Japanese (ja)
Other versions
JPS6259947B2 (en
Inventor
Kunio Nagashima
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP11136679A priority Critical patent/JPS5636256A/en
Publication of JPS5636256A publication Critical patent/JPS5636256A/en
Publication of JPS6259947B2 publication Critical patent/JPS6259947B2/ja
Granted 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
    • H04M9/003—Transmission of control signals from or to the key telephone set; signalling equipment at key telephone set, e.g. keyboard or display equipment

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To make possible call control similar to general trelephone sets, by providing another winding in the normal transformer connected to the speaking circuit of the tone ringer transmission circuit and by making the audible signal source in every key telephne set needless. CONSTITUTION:The audible signal output from audible signal source 300 is applied to the input of amplifier 107 through the first switch element 301, the first transformer 310, and hook switch 105, and the audible signal amplified by amplifier 107 sounds speaker 110. Meanwhile, general telephone set 203 is connected to one of the third incoming line 205 and ringer signal source 206 selectively. The third transformer 312 is inserted to prevent the feeding current to telephone set 203 from being flowed to channel 100. The third winding is added to the transformer for DC stop, and the call signal for the key telephone set is supplied from this winding.
JP11136679A 1979-08-31 1979-08-31 Tone ringer transmission circuit Granted JPS5636256A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11136679A JPS5636256A (en) 1979-08-31 1979-08-31 Tone ringer transmission circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11136679A JPS5636256A (en) 1979-08-31 1979-08-31 Tone ringer transmission circuit

Publications (2)

Publication Number Publication Date
JPS5636256A true JPS5636256A (en) 1981-04-09
JPS6259947B2 JPS6259947B2 (en) 1987-12-14

Family

ID=14559364

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11136679A Granted JPS5636256A (en) 1979-08-31 1979-08-31 Tone ringer transmission circuit

Country Status (1)

Country Link
JP (1) JPS5636256A (en)

Also Published As

Publication number Publication date
JPS6259947B2 (en) 1987-12-14

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