JPS5420605A - Interphone - Google Patents

Interphone

Info

Publication number
JPS5420605A
JPS5420605A JP8630577A JP8630577A JPS5420605A JP S5420605 A JPS5420605 A JP S5420605A JP 8630577 A JP8630577 A JP 8630577A JP 8630577 A JP8630577 A JP 8630577A JP S5420605 A JPS5420605 A JP S5420605A
Authority
JP
Japan
Prior art keywords
interphone
handset
eliminate
filter
providing
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
JP8630577A
Other languages
Japanese (ja)
Inventor
Toshio Abiko
Yoshiharu Suzuki
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP8630577A priority Critical patent/JPS5420605A/en
Publication of JPS5420605A publication Critical patent/JPS5420605A/en
Pending 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
    • H04M9/087—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using different frequency bands for transmitting and receiving paths ; using phase shifting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

PURPOSE:To eliminate the need of the handset of a master device, and to prevent howling by providing a delay circuit and filter into a sound loop.
JP8630577A 1977-07-15 1977-07-15 Interphone Pending JPS5420605A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8630577A JPS5420605A (en) 1977-07-15 1977-07-15 Interphone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8630577A JPS5420605A (en) 1977-07-15 1977-07-15 Interphone

Publications (1)

Publication Number Publication Date
JPS5420605A true JPS5420605A (en) 1979-02-16

Family

ID=13883114

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8630577A Pending JPS5420605A (en) 1977-07-15 1977-07-15 Interphone

Country Status (1)

Country Link
JP (1) JPS5420605A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5050802A (en) * 1973-09-04 1975-05-07
JPS5074308A (en) * 1973-11-01 1975-06-19

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5050802A (en) * 1973-09-04 1975-05-07
JPS5074308A (en) * 1973-11-01 1975-06-19

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