IT1213063B - ELECTRONIC CIRCUIT FOR USE IN A TELEPHONE WITH AMPLIFIED OR HANDS-FREE RECEPTION. - Google Patents

ELECTRONIC CIRCUIT FOR USE IN A TELEPHONE WITH AMPLIFIED OR HANDS-FREE RECEPTION.

Info

Publication number
IT1213063B
IT1213063B IT8620181A IT2018186A IT1213063B IT 1213063 B IT1213063 B IT 1213063B IT 8620181 A IT8620181 A IT 8620181A IT 2018186 A IT2018186 A IT 2018186A IT 1213063 B IT1213063 B IT 1213063B
Authority
IT
Italy
Prior art keywords
hands
amplified
telephone
electronic circuit
free reception
Prior art date
Application number
IT8620181A
Other languages
Italian (it)
Other versions
IT8620181A0 (en
Inventor
David Crawford Odhams
Original Assignee
Int Standard Electric 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 Int Standard Electric Corp filed Critical Int Standard Electric Corp
Publication of IT8620181A0 publication Critical patent/IT8620181A0/en
Application granted granted Critical
Publication of IT1213063B publication Critical patent/IT1213063B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • 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
    • H04M9/085—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using digital techniques

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
IT8620181A 1985-05-04 1986-04-22 ELECTRONIC CIRCUIT FOR USE IN A TELEPHONE WITH AMPLIFIED OR HANDS-FREE RECEPTION. IT1213063B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08511431A GB2174578B (en) 1985-05-04 1985-05-04 Loud speaking telephone

Publications (2)

Publication Number Publication Date
IT8620181A0 IT8620181A0 (en) 1986-04-22
IT1213063B true IT1213063B (en) 1989-12-07

Family

ID=10578696

Family Applications (1)

Application Number Title Priority Date Filing Date
IT8620181A IT1213063B (en) 1985-05-04 1986-04-22 ELECTRONIC CIRCUIT FOR USE IN A TELEPHONE WITH AMPLIFIED OR HANDS-FREE RECEPTION.

Country Status (2)

Country Link
GB (1) GB2174578B (en)
IT (1) IT1213063B (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3609706C1 (en) * 1986-03-21 1987-11-05 Siemens Ag Process for the electronic replication of the hook switch and the handsfree loudspeaker key in a handsfree loudspeaker telephone station
US4741018A (en) * 1987-04-24 1988-04-26 Motorola, Inc. Speakerphone using digitally compressed audio to control voice path gain
US4843621A (en) * 1987-04-24 1989-06-27 Motorola, Inc. Speakerphone using digitally compressed audio to detect acoustic feedback
DE3728109C1 (en) * 1987-08-22 1989-03-16 Telefonbau & Normalzeit Gmbh Method for voice-controlled attenuation control in telephone transmission circuits
US4901346A (en) * 1988-12-28 1990-02-13 American Telephone And Telegraph Co. Computer controlled speakerphone for adapting to a communication line
SE466427B (en) * 1990-06-25 1992-02-10 Ericsson Telefon Ab L M HAND RELEASE MODULE FOR A MOBILE PHONE
FR2665807B1 (en) * 1990-08-08 1994-06-03 Alcatel Business Systems "FREE HAND" TELEPHONE DEVICE.
US5075687A (en) * 1990-09-27 1991-12-24 Advanced Micro Devices, Inc. Echo suppression with both digital and analog variable attenuators
JPH0530502A (en) * 1991-07-24 1993-02-05 Hitachi Ltd Integrated video telephone set
KR920017511A (en) * 1991-02-28 1992-09-26 빈센트 죠셉 로너 Integrated speakerphone circuit and serial port interface for speakerphone
US5257413A (en) * 1991-10-10 1993-10-26 Motorola, Inc. Option selection method and apparatus
US5450618A (en) * 1992-04-30 1995-09-12 Motorola, Inc. Full duplex and half duplex communication unit with volume setting
JP3508776B2 (en) * 1993-01-14 2004-03-22 ソニー株式会社 Transceiver
US5857019A (en) * 1996-06-11 1999-01-05 Siemens Business Communication Systems, Inc. Apparatus and method for providing a telephone user with control of the threshold volume at which the user's voice will take control of a half-duplex speakerphone conversation
US6978009B1 (en) * 1996-08-20 2005-12-20 Legerity, Inc. Microprocessor-controlled full-duplex speakerphone using automatic gain control

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1058556A (en) *
GB1232974A (en) * 1967-06-16 1971-05-26
SE365375B (en) * 1972-12-18 1974-03-18 Ericsson Telefon Ab L M
CA976677A (en) * 1973-03-12 1975-10-21 Northern Electric Company Loudspeaking communication terminal apparatus and method of operation
GB1511487A (en) * 1974-12-02 1978-05-17 Gen Electric Loudspeaking telephone instruments
CA996692A (en) * 1974-12-12 1976-09-07 Russell W. Brown Digital control of a loudspeaking telephone system
US3942116A (en) * 1975-03-13 1976-03-02 California Microwave, Inc. Transceiver having improved voice actuated carrier and echo suppression circuit
CA1058340A (en) * 1975-06-30 1979-07-10 International Standard Electric Corporation Two-way loudspeaking device for telephone stations
SE399502B (en) * 1976-06-08 1978-02-13 Karlsson Lars Percy FOR TELEPHONE SYSTEMS WITH SPEAKER EQUIPPED TELEPHONE DEVICES INTENDED CONTROL DEVICE
DE2638286C3 (en) * 1976-08-25 1979-03-01 Dasy Inter S.A., Genf (Schweiz) Circuit arrangement for a hands-free telephone
DE2659028C3 (en) * 1976-12-27 1979-05-31 Dasy Inter S.A., Genf (Schweiz) Circuit arrangement for preventing feedback
GB2105153A (en) * 1981-07-21 1983-03-16 Telspec Ltd Improvements in voice switched amplifiers
GB2122851B (en) * 1982-06-10 1986-03-19 Standard Telephones Cables Ltd Loudspeaking telephones
GB2137458B (en) * 1983-03-01 1986-11-19 Standard Telephones Cables Ltd Digital handsfree telephone

Also Published As

Publication number Publication date
GB8511431D0 (en) 1985-06-12
GB2174578A (en) 1986-11-05
IT8620181A0 (en) 1986-04-22
GB2174578B (en) 1988-11-09

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