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DE2920834A1 - Gegensprechsystem - Google Patents

Gegensprechsystem

Info

Publication number
DE2920834A1
DE2920834A1 DE19792920834 DE2920834A DE2920834A1 DE 2920834 A1 DE2920834 A1 DE 2920834A1 DE 19792920834 DE19792920834 DE 19792920834 DE 2920834 A DE2920834 A DE 2920834A DE 2920834 A1 DE2920834 A1 DE 2920834A1
Authority
DE
Germany
Prior art keywords
circuit
amplifier
transistor
line
output
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.)
Withdrawn
Application number
DE19792920834
Other languages
German (de)
English (en)
Inventor
Maynard E White
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.)
Individual
Original Assignee
Individual
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
Priority claimed from US05/909,685 external-priority patent/US4166978A/en
Application filed by Individual filed Critical Individual
Publication of DE2920834A1 publication Critical patent/DE2920834A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A42—HEADWEAR
    • A42B—HATS; HEAD COVERINGS
    • A42B3/00—Helmets; Helmet covers ; Other protective head coverings
    • A42B3/04—Parts, details or accessories of helmets
    • A42B3/30—Mounting radio sets or communication systems
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
  • Transmitters (AREA)
  • Mobile Radio Communication Systems (AREA)
DE19792920834 1978-05-25 1979-05-23 Gegensprechsystem Withdrawn DE2920834A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/909,685 US4166978A (en) 1976-09-07 1978-05-25 Two-way voice controlled communication system

Publications (1)

Publication Number Publication Date
DE2920834A1 true DE2920834A1 (de) 1979-11-29

Family

ID=25427662

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19792920834 Withdrawn DE2920834A1 (de) 1978-05-25 1979-05-23 Gegensprechsystem

Country Status (8)

Country Link
JP (1) JPS54154212A (pt)
BR (1) BR7901085A (pt)
CA (1) CA1116239A (pt)
DE (1) DE2920834A1 (pt)
FR (1) FR2427014A1 (pt)
GB (1) GB2021902B (pt)
IT (1) IT1116191B (pt)
MX (1) MX145103A (pt)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2271247B (en) * 1992-10-05 1997-02-19 Motorola Israel Ltd A radio telephone for a vehicle
DE9409319U1 (de) * 1994-06-08 1995-07-06 Berlin, Florence, Genf Sende-Empfangsgerät
EP2137722A4 (en) * 2007-03-30 2014-06-25 Savox Comm Oy Ab Ltd RADIO COMMUNICATION DEVICE

Also Published As

Publication number Publication date
IT7949130A0 (it) 1979-05-22
MX145103A (es) 1982-01-05
CA1116239A (en) 1982-01-12
BR7901085A (pt) 1979-11-20
JPS54154212A (en) 1979-12-05
GB2021902B (en) 1982-08-25
FR2427014A1 (fr) 1979-12-21
IT1116191B (it) 1986-02-10
GB2021902A (en) 1979-12-05

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Legal Events

Date Code Title Description
8139 Disposal/non-payment of the annual fee