JPS5717258A - Button telephone set - Google Patents

Button telephone set

Info

Publication number
JPS5717258A
JPS5717258A JP9212880A JP9212880A JPS5717258A JP S5717258 A JPS5717258 A JP S5717258A JP 9212880 A JP9212880 A JP 9212880A JP 9212880 A JP9212880 A JP 9212880A JP S5717258 A JPS5717258 A JP S5717258A
Authority
JP
Japan
Prior art keywords
telephone set
microphone
reception
transmission
circuit
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
JP9212880A
Other languages
Japanese (ja)
Inventor
Mamoru Senzai
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 JP9212880A priority Critical patent/JPS5717258A/en
Publication of JPS5717258A publication Critical patent/JPS5717258A/en
Pending 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
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets

Landscapes

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

Abstract

PURPOSE:To constitute a circuit with good separation for transmission and reception sound, by commonly using a dynamic microphone for the hand-free call and a transceiver call, coupling a transmission circuit and receiving circuit with a resistance hybrid, and exchanging the gain interlockingly. CONSTITUTION:A button telephone set 2 couples a transmission 21 and reception 19 with a resistance hybrid circuit 18 and it is connected to an extension channel 8. A microphone 10 uses a dynamic type or electret type and is connected to a microphone amplifier 11 having an extension calling detection relay 12 for gain switching. A receiver 6 is connected to a reception amplifier 20 via an extension calling detection relay 16. A button telephone set 2' is constituted as the same. When the telephone set 2 calls out the telephone set 2' with a dial, calling detection relays 12', 16' are operated and the sound of the microphone 10 is outputted from a speaker 14'. The audio of the telephone set 2' is outputted to the receiver via a microphone 10' and an amplifier 11' and the telephone set 2' is at hand-free call. Thus, the hand-free call with good sound separation for transmission and reception can be made.
JP9212880A 1980-07-04 1980-07-04 Button telephone set Pending JPS5717258A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9212880A JPS5717258A (en) 1980-07-04 1980-07-04 Button telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9212880A JPS5717258A (en) 1980-07-04 1980-07-04 Button telephone set

Publications (1)

Publication Number Publication Date
JPS5717258A true JPS5717258A (en) 1982-01-28

Family

ID=14045791

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9212880A Pending JPS5717258A (en) 1980-07-04 1980-07-04 Button telephone set

Country Status (1)

Country Link
JP (1) JPS5717258A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61208951A (en) * 1985-03-13 1986-09-17 Sharp Corp Loudspeaker telephone set
JPH0221002U (en) * 1988-07-28 1990-02-13

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61208951A (en) * 1985-03-13 1986-09-17 Sharp Corp Loudspeaker telephone set
JPH0444860B2 (en) * 1985-03-13 1992-07-23 Sharp Kk
JPH0221002U (en) * 1988-07-28 1990-02-13

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