CA932489A - Duplex interphone - Google Patents

Duplex interphone

Info

Publication number
CA932489A
CA932489A CA098185A CA98185A CA932489A CA 932489 A CA932489 A CA 932489A CA 098185 A CA098185 A CA 098185A CA 98185 A CA98185 A CA 98185A CA 932489 A CA932489 A CA 932489A
Authority
CA
Canada
Prior art keywords
interphone
duplex
duplex interphone
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
Application number
CA098185A
Other languages
English (en)
Other versions
CA98185S (en
Inventor
Nakamura Isao
Matsuzaki Hiroshi
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
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 Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Application granted granted Critical
Publication of CA932489A publication Critical patent/CA932489A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/36—Repeater circuits
    • H04B3/38—Repeater circuits for signals in two different frequency ranges transmitted in opposite directions over the same transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
CA098185A 1969-11-19 1970-11-16 Duplex interphone Expired CA932489A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10919869 1969-11-19
JP5638770 1970-06-29

Publications (1)

Publication Number Publication Date
CA932489A true CA932489A (en) 1973-08-21

Family

ID=26397341

Family Applications (1)

Application Number Title Priority Date Filing Date
CA098185A Expired CA932489A (en) 1969-11-19 1970-11-16 Duplex interphone

Country Status (5)

Country Link
US (1) US3705412A (fr)
CA (1) CA932489A (fr)
DE (1) DE2056754A1 (fr)
FR (1) FR2069674A5 (fr)
GB (1) GB1297688A (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4996709A (en) * 1988-05-12 1991-02-26 Tandy Corporation Intercom telephone
US6882716B2 (en) * 2001-03-28 2005-04-19 Intel Corporation Local control of call features in a telephone system
US11720318B2 (en) * 2021-12-17 2023-08-08 Motorola Solutions, Inc. Audio accessory with high and low impedance paths to a speaker, and a radio for the audio accessory

Also Published As

Publication number Publication date
GB1297688A (fr) 1972-11-29
DE2056754A1 (de) 1971-12-16
US3705412A (en) 1972-12-05
FR2069674A5 (fr) 1971-09-03

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