JPS5525252A - Loud speaker telephone set - Google Patents

Loud speaker telephone set

Info

Publication number
JPS5525252A
JPS5525252A JP9804878A JP9804878A JPS5525252A JP S5525252 A JPS5525252 A JP S5525252A JP 9804878 A JP9804878 A JP 9804878A JP 9804878 A JP9804878 A JP 9804878A JP S5525252 A JPS5525252 A JP S5525252A
Authority
JP
Japan
Prior art keywords
pilot lamp
switch
nonturn
alarming
intermittently
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
JP9804878A
Other languages
Japanese (ja)
Other versions
JPS5856301B2 (en
Inventor
Kinichi Uno
Kunihiro Kato
Ryoichi Okayasu
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
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone 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 Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP53098048A priority Critical patent/JPS5856301B2/en
Publication of JPS5525252A publication Critical patent/JPS5525252A/en
Publication of JPS5856301B2 publication Critical patent/JPS5856301B2/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
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To secure alarming of nonturn-off of the loudspeaker talking switch to the user by lighting up the pilot lamp and also giving the singing intermittently after detecting discontinuation of the reception signal for over a fixed time. CONSTITUTION:When the loudspeaker talking is over and the remote subscriber hangs up the receiver, no receiving signal exists at line terminal 5. And in lapse of a fixed time, non-receiving signal detection circuit 13 operates to flash pilot lamp 16. Thus the output of pilot lamp control circuit 14 actuates aural switch control circuit 15 to give the forced reduction control to the insertion loss of transmitting and receiving aural switch circuits 3 and 6 in accordance with the flashing period of the pilot lamp. As a result, the acoustic combination is formed to microphone 1 to produce the ringing intermittently from speaker 8 and via the space, thus alarming the nonturn-off of the loudspeaker talking switch to the user.
JP53098048A 1978-08-10 1978-08-10 public address telephone Expired JPS5856301B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53098048A JPS5856301B2 (en) 1978-08-10 1978-08-10 public address telephone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53098048A JPS5856301B2 (en) 1978-08-10 1978-08-10 public address telephone

Publications (2)

Publication Number Publication Date
JPS5525252A true JPS5525252A (en) 1980-02-22
JPS5856301B2 JPS5856301B2 (en) 1983-12-14

Family

ID=14209284

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53098048A Expired JPS5856301B2 (en) 1978-08-10 1978-08-10 public address telephone

Country Status (1)

Country Link
JP (1) JPS5856301B2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS449606Y1 (en) * 1966-12-16 1969-04-18

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS449606Y1 (en) * 1966-12-16 1969-04-18

Also Published As

Publication number Publication date
JPS5856301B2 (en) 1983-12-14

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