JPH027545B2 - - Google Patents

Info

Publication number
JPH027545B2
JPH027545B2 JP56144580A JP14458081A JPH027545B2 JP H027545 B2 JPH027545 B2 JP H027545B2 JP 56144580 A JP56144580 A JP 56144580A JP 14458081 A JP14458081 A JP 14458081A JP H027545 B2 JPH027545 B2 JP H027545B2
Authority
JP
Japan
Prior art keywords
amplifier
telephone
circuit
input
switch 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.)
Expired - Lifetime
Application number
JP56144580A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5847359A (ja
Inventor
Hirozo Shintani
Eiji Morikami
Masaru Kudo
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.)
Nippon Telegraph and Telephone Corp
Iwasaki Tsushinki KK
Original Assignee
Nippon Telegraph and Telephone Corp
Iwasaki Tsushinki KK
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 Nippon Telegraph and Telephone Corp, Iwasaki Tsushinki KK filed Critical Nippon Telegraph and Telephone Corp
Priority to JP56144580A priority Critical patent/JPS5847359A/ja
Publication of JPS5847359A publication Critical patent/JPS5847359A/ja
Publication of JPH027545B2 publication Critical patent/JPH027545B2/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
    • H04M1/60—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)
JP56144580A 1981-09-16 1981-09-16 電話装置 Granted JPS5847359A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56144580A JPS5847359A (ja) 1981-09-16 1981-09-16 電話装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56144580A JPS5847359A (ja) 1981-09-16 1981-09-16 電話装置

Publications (2)

Publication Number Publication Date
JPS5847359A JPS5847359A (ja) 1983-03-19
JPH027545B2 true JPH027545B2 (fr) 1990-02-19

Family

ID=15365443

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56144580A Granted JPS5847359A (ja) 1981-09-16 1981-09-16 電話装置

Country Status (1)

Country Link
JP (1) JPS5847359A (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4520254Y1 (fr) * 1967-08-28 1970-08-14
JPS52143704A (en) * 1976-05-26 1977-11-30 Iwatsu Electric Co Ltd Telephone with reception amplifier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4520254Y1 (fr) * 1967-08-28 1970-08-14
JPS52143704A (en) * 1976-05-26 1977-11-30 Iwatsu Electric Co Ltd Telephone with reception amplifier

Also Published As

Publication number Publication date
JPS5847359A (ja) 1983-03-19

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