JPS54114011A - Loudspeaker telephone device - Google Patents

Loudspeaker telephone device

Info

Publication number
JPS54114011A
JPS54114011A JP2073678A JP2073678A JPS54114011A JP S54114011 A JPS54114011 A JP S54114011A JP 2073678 A JP2073678 A JP 2073678A JP 2073678 A JP2073678 A JP 2073678A JP S54114011 A JPS54114011 A JP S54114011A
Authority
JP
Japan
Prior art keywords
circuit
system circuit
howling
diode
closed
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
JP2073678A
Other languages
English (en)
Inventor
Takeshi Horiuchi
Katsutoshi Yamashita
Shinichi Shibata
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP2073678A priority Critical patent/JPS54114011A/ja
Publication of JPS54114011A publication Critical patent/JPS54114011A/ja
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
    • H04M1/02—Constructional features of telephone sets
    • H04M1/20—Arrangements for preventing acoustic feed-back
JP2073678A 1978-02-24 1978-02-24 Loudspeaker telephone device Pending JPS54114011A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2073678A JPS54114011A (en) 1978-02-24 1978-02-24 Loudspeaker telephone device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2073678A JPS54114011A (en) 1978-02-24 1978-02-24 Loudspeaker telephone device

Publications (1)

Publication Number Publication Date
JPS54114011A true JPS54114011A (en) 1979-09-05

Family

ID=12035471

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2073678A Pending JPS54114011A (en) 1978-02-24 1978-02-24 Loudspeaker telephone device

Country Status (1)

Country Link
JP (1) JPS54114011A (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS643354U (ja) * 1987-06-25 1989-01-10
US5373563A (en) * 1990-10-05 1994-12-13 Kukurudza; Vladimir W. Self damping speaker matching device
US5379450A (en) * 1991-10-28 1995-01-03 Nec Corporation Radio loudspeaker telephone device capable of automatically preventing howling on execution of calling operation
US5519781A (en) * 1990-10-05 1996-05-21 Kukurudza; Vladimir W. Self damping speaker matching device and method
US5615272A (en) * 1995-11-08 1997-03-25 Kukurudza; Vladimir W. Single loud speaker drive system
US5917922A (en) * 1995-11-08 1999-06-29 Kukurudza; Vladimir Walter Method of operating a single loud speaker drive system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS643354U (ja) * 1987-06-25 1989-01-10
JPH0445323Y2 (ja) * 1987-06-25 1992-10-26
US5373563A (en) * 1990-10-05 1994-12-13 Kukurudza; Vladimir W. Self damping speaker matching device
US5519781A (en) * 1990-10-05 1996-05-21 Kukurudza; Vladimir W. Self damping speaker matching device and method
US5379450A (en) * 1991-10-28 1995-01-03 Nec Corporation Radio loudspeaker telephone device capable of automatically preventing howling on execution of calling operation
US5615272A (en) * 1995-11-08 1997-03-25 Kukurudza; Vladimir W. Single loud speaker drive system
US5917922A (en) * 1995-11-08 1999-06-29 Kukurudza; Vladimir Walter Method of operating a single loud speaker drive system

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