IT1116453B - IMPROVEMENT IN INTERCOMMUNICATIONS SYSTEMS - Google Patents

IMPROVEMENT IN INTERCOMMUNICATIONS SYSTEMS

Info

Publication number
IT1116453B
IT1116453B IT48751/79A IT4875179A IT1116453B IT 1116453 B IT1116453 B IT 1116453B IT 48751/79 A IT48751/79 A IT 48751/79A IT 4875179 A IT4875179 A IT 4875179A IT 1116453 B IT1116453 B IT 1116453B
Authority
IT
Italy
Prior art keywords
intercommunications
improvement
systems
intercommunications systems
Prior art date
Application number
IT48751/79A
Other languages
Italian (it)
Other versions
IT7948751A0 (en
Original Assignee
Hung Nien Electronics 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 Hung Nien Electronics Ltd filed Critical Hung Nien Electronics Ltd
Publication of IT7948751A0 publication Critical patent/IT7948751A0/en
Application granted granted Critical
Publication of IT1116453B publication Critical patent/IT1116453B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/44—Transmit/receive switching
    • H04B1/46—Transmit/receive switching by voice-frequency signals; by pilot signals
    • 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
    • H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Mobile Radio Communication Systems (AREA)
IT48751/79A 1978-08-01 1979-04-17 IMPROVEMENT IN INTERCOMMUNICATIONS SYSTEMS IT1116453B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7831781A GB2027566A (en) 1978-08-01 1978-08-01 Automatic intercom

Publications (2)

Publication Number Publication Date
IT7948751A0 IT7948751A0 (en) 1979-04-17
IT1116453B true IT1116453B (en) 1986-02-10

Family

ID=10498781

Family Applications (1)

Application Number Title Priority Date Filing Date
IT48751/79A IT1116453B (en) 1978-08-01 1979-04-17 IMPROVEMENT IN INTERCOMMUNICATIONS SYSTEMS

Country Status (4)

Country Link
DE (1) DE2850874A1 (en)
FR (1) FR2432800A1 (en)
GB (1) GB2027566A (en)
IT (1) IT1116453B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2159375A (en) * 1984-05-19 1985-11-27 Advance Electronic Prod Interrupt on priority communication systems
US5239687A (en) * 1991-05-06 1993-08-24 Chen Shih Chung Wireless intercom having a transceiver in which a bias current for the condenser microphone and the driving current for the speaker are used to charge a battery during transmission and reception, respectively

Also Published As

Publication number Publication date
DE2850874A1 (en) 1980-02-14
GB2027566A (en) 1980-02-20
FR2432800A1 (en) 1980-02-29
IT7948751A0 (en) 1979-04-17

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