ES553429A0 - Un circuito para proporcionar aislamiento entre dos canales de comunicacion especialmente en telefonos de manos libres - Google Patents

Un circuito para proporcionar aislamiento entre dos canales de comunicacion especialmente en telefonos de manos libres

Info

Publication number
ES553429A0
ES553429A0 ES553429A ES553429A ES553429A0 ES 553429 A0 ES553429 A0 ES 553429A0 ES 553429 A ES553429 A ES 553429A ES 553429 A ES553429 A ES 553429A ES 553429 A0 ES553429 A0 ES 553429A0
Authority
ES
Spain
Prior art keywords
hands
circuit
communication channels
provide isolation
free telephones
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.)
Granted
Application number
ES553429A
Other languages
English (en)
Other versions
ES8707056A1 (es
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.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
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 Alcatel Espana SA filed Critical Alcatel Espana SA
Publication of ES8707056A1 publication Critical patent/ES8707056A1/es
Publication of ES553429A0 publication Critical patent/ES553429A0/es
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • 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)
  • Amplifiers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Telephonic Communication Services (AREA)
ES553429A 1985-03-27 1986-03-26 Un circuito para proporcionar aislamiento entre dos canales de comunicacion especialmente en telefonos de manos libres Expired ES8707056A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/716,438 US4641339A (en) 1985-03-27 1985-03-27 Variable bandwidth handsfree telephone using switched capacitor filtering

Publications (2)

Publication Number Publication Date
ES8707056A1 ES8707056A1 (es) 1987-07-01
ES553429A0 true ES553429A0 (es) 1987-07-01

Family

ID=24877994

Family Applications (1)

Application Number Title Priority Date Filing Date
ES553429A Expired ES8707056A1 (es) 1985-03-27 1986-03-26 Un circuito para proporcionar aislamiento entre dos canales de comunicacion especialmente en telefonos de manos libres

Country Status (5)

Country Link
US (1) US4641339A (es)
JP (1) JPS61225955A (es)
KR (1) KR920009379B1 (es)
DE (1) DE3606973A1 (es)
ES (1) ES8707056A1 (es)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4819263A (en) * 1986-06-30 1989-04-04 Cellular Communications Corporation Apparatus and method for hands free telephonic communication
JPH0683305B2 (ja) * 1987-03-12 1994-10-19 日本電気株式会社 拡声電話機
DE3728109C1 (de) * 1987-08-22 1989-03-16 Telefonbau & Normalzeit Gmbh Verfahren fuer die sprachgesteuerte Daempfungsregelung in Fernsprechuebertragungskreisen
US4879746A (en) * 1987-12-30 1989-11-07 Plantronics, Inc. Voice communication link interface apparatus
DE4021787A1 (de) * 1990-07-09 1992-01-16 Telefunken Electronic Gmbh Elektro-akustisches system
US5333194A (en) * 1990-10-15 1994-07-26 Glenayre Electronics, Inc. Autoequalizing bidirectional-to-unidirectional hybrid network
JP2606167B2 (ja) * 1994-12-07 1997-04-30 日本電気株式会社 電話機
US6049561A (en) * 1997-04-30 2000-04-11 Raytheon Company Radio frequency communication system
KR200481139Y1 (ko) * 2015-05-28 2016-08-19 주식회사 아가프라 유아용 음료팩 홀더

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB922003A (en) * 1958-11-12 1963-03-27 Modern Telephones Great Britai Improvements in or relating to two-way communication telephone systems
CH492357A (it) * 1966-12-24 1970-06-15 Consiglio Naz Delle Ricerche E Procedimento per migliorare la qualità della trasmissione di circuiti telefonici
JPS4911405A (es) * 1972-05-30 1974-01-31
JPS5822249A (ja) * 1981-08-03 1983-02-09 Toyo Kikai Kk テンタのア−ム回動装置

Also Published As

Publication number Publication date
KR860007792A (ko) 1986-10-17
ES8707056A1 (es) 1987-07-01
JPH047869B2 (es) 1992-02-13
KR920009379B1 (ko) 1992-10-15
DE3606973A1 (de) 1986-10-09
JPS61225955A (ja) 1986-10-07
US4641339A (en) 1987-02-03

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