DE2514845A1 - Sende-empfangsgeraet - Google Patents

Sende-empfangsgeraet

Info

Publication number
DE2514845A1
DE2514845A1 DE19752514845 DE2514845A DE2514845A1 DE 2514845 A1 DE2514845 A1 DE 2514845A1 DE 19752514845 DE19752514845 DE 19752514845 DE 2514845 A DE2514845 A DE 2514845A DE 2514845 A1 DE2514845 A1 DE 2514845A1
Authority
DE
Germany
Prior art keywords
line
converter
transmitter
amplifier
pair
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.)
Ceased
Application number
DE19752514845
Other languages
German (de)
English (en)
Inventor
Giichi Ito
Kazuhiko Kakehi
Ryoichi Matsuda
Masaaki Terai
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.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Publication of DE2514845A1 publication Critical patent/DE2514845A1/de
Ceased legal-status Critical Current

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
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Telephone Function (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
DE19752514845 1974-04-04 1975-04-04 Sende-empfangsgeraet Ceased DE2514845A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP49037326A JPS50131705A (enExample) 1974-04-04 1974-04-04

Publications (1)

Publication Number Publication Date
DE2514845A1 true DE2514845A1 (de) 1975-10-09

Family

ID=12494516

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19752514845 Ceased DE2514845A1 (de) 1974-04-04 1975-04-04 Sende-empfangsgeraet

Country Status (6)

Country Link
US (1) US4002860A (enExample)
JP (1) JPS50131705A (enExample)
CA (1) CA1026027A (enExample)
DE (1) DE2514845A1 (enExample)
GB (1) GB1507343A (enExample)
SE (1) SE402848B (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2913244C2 (de) * 1979-04-03 1981-07-02 Krone Gmbh, 1000 Berlin Taktgesteuerte Gegensprecheinrichtung zur Vermeidung akustischer Rückkopplung mit einem oder mehreren Schallwandlern

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4115658A (en) * 1977-04-11 1978-09-19 Williams Richard W Two way telephone amplifier
US4251689A (en) * 1979-07-09 1981-02-17 Canadian Patents & Dev. Ltd. Loudspeaker telephone apparatus
US7072476B2 (en) * 1997-02-18 2006-07-04 Matech, Inc. Audio headset
US5907538A (en) 1997-02-18 1999-05-25 White; Donald R. Full duplex communication circuit with a transducer for simultaneously generating audio output and receiving audio input
US6298046B1 (en) * 1998-08-28 2001-10-02 Rc Networks Adjustable balancing circuit for an adaptive hybrid and method of adjusting the same
US7826805B2 (en) * 2003-11-11 2010-11-02 Matech, Inc. Automatic-switching wireless communication device
KR100851286B1 (ko) * 2003-11-11 2008-08-08 마테크, 인코포레이티드 단일 트랜스듀서를 갖는 쌍방향 통신 장치
US8315379B2 (en) * 2004-11-10 2012-11-20 Matech, Inc. Single transducer full duplex talking circuit
JP5009913B2 (ja) * 2006-07-27 2012-08-29 株式会社Ｓ＆Ｓエンジニアリング 自走台車の水平搬送機構
DK2389774T3 (en) * 2009-01-23 2015-01-19 Widex As System, method and hearing aids for in situ okklusionseffektmåling
JP5607824B2 (ja) * 2010-07-05 2014-10-15 ヴェーデクス・アクティーセルスカプ 補聴器ユーザの閉塞効果を計測しかつ確認するシステムおよび方法
DE102017105594A1 (de) * 2017-03-16 2018-09-20 USound GmbH Verstärkereinheit für einen Schallwandler und Schallerzeugungseinheit

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2282465A (en) * 1941-02-27 1942-05-12 Bell Telephone Labor Inc Speech transmission system
US2535063A (en) * 1945-05-03 1950-12-26 Farnsworth Res Corp Communicating system
NL190604A (enExample) * 1953-09-11
US3178648A (en) * 1962-06-18 1965-04-13 De Loss J Tanner Transistorized amplifier utilizing an input transformer bootstrap configuration
US3889058A (en) * 1969-01-15 1975-06-10 Ard Anstalt Telephone systems with reduced acoustic feedback
US3784755A (en) * 1971-09-07 1974-01-08 Bell Canada Northern Electric Long-line telephone circuit
JPS5233963B2 (enExample) * 1971-09-28 1977-08-31
US3753786A (en) * 1972-03-29 1973-08-21 Gould Inc Method and apparatus for adjusting battery electrolyte concentration
JPS5226972B2 (enExample) * 1973-07-28 1977-07-18

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2913244C2 (de) * 1979-04-03 1981-07-02 Krone Gmbh, 1000 Berlin Taktgesteuerte Gegensprecheinrichtung zur Vermeidung akustischer Rückkopplung mit einem oder mehreren Schallwandlern

Also Published As

Publication number Publication date
US4002860A (en) 1977-01-11
GB1507343A (en) 1978-04-12
SE7503851L (sv) 1975-10-06
SE402848B (sv) 1978-07-17
CA1026027A (en) 1978-02-07
JPS50131705A (enExample) 1975-10-18

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Legal Events

Date Code Title Description
8131 Rejection