SE402848B - Sendnings- och mottagningsapparatur - Google Patents

Sendnings- och mottagningsapparatur

Info

Publication number
SE402848B
SE402848B SE7503851A SE7503851A SE402848B SE 402848 B SE402848 B SE 402848B SE 7503851 A SE7503851 A SE 7503851A SE 7503851 A SE7503851 A SE 7503851A SE 402848 B SE402848 B SE 402848B
Authority
SE
Sweden
Prior art keywords
transmission
reception equipment
reception
equipment
Prior art date
Application number
SE7503851A
Other languages
English (en)
Swedish (sv)
Other versions
SE7503851L (sv
Inventor
M Terai
K Kakehi
R Matsuda
G Ito
Original Assignee
Nippon Telegraph & Telephone
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 & Telephone filed Critical Nippon Telegraph & Telephone
Publication of SE7503851L publication Critical patent/SE7503851L/xx
Publication of SE402848B publication Critical patent/SE402848B/xx

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)
  • Telephone Function (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
SE7503851A 1974-04-04 1975-04-03 Sendnings- och mottagningsapparatur SE402848B (sv)

Applications Claiming Priority (1)

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

Publications (2)

Publication Number Publication Date
SE7503851L SE7503851L (sv) 1975-10-06
SE402848B true SE402848B (sv) 1978-07-17

Family

ID=12494516

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7503851A SE402848B (sv) 1974-04-04 1975-04-03 Sendnings- och mottagningsapparatur

Country Status (6)

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

Families Citing this family (13)

* 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
DE2913244C2 (de) * 1979-04-03 1981-07-02 Krone Gmbh, 1000 Berlin Taktgesteuerte Gegensprecheinrichtung zur Vermeidung akustischer Rückkopplung mit einem oder mehreren Schallwandlern
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
KR100851286B1 (ko) * 2003-11-11 2008-08-08 마테크, 인코포레이티드 단일 트랜스듀서를 갖는 쌍방향 통신 장치
WO2005048574A1 (en) * 2003-11-11 2005-05-26 Matech, Inc. Automatic-switching wireless communication device
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
CA2750445A1 (en) * 2009-01-23 2010-07-29 Widex A/S A system, method and hearing aids for in situ occlusion effect measurement
CA2804449C (en) * 2010-07-05 2015-06-16 Widex A/S System and method for measuring and validating the occlusion effect of a hearing aid user
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 (ja) * 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 (ja) * 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 (ja) * 1973-07-28 1977-07-18

Also Published As

Publication number Publication date
DE2514845A1 (de) 1975-10-09
GB1507343A (en) 1978-04-12
CA1026027A (en) 1978-02-07
US4002860A (en) 1977-01-11
SE7503851L (sv) 1975-10-06
JPS50131705A (ja) 1975-10-18

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