GB8511431D0 - Loud speaking telephone - Google Patents

Loud speaking telephone

Info

Publication number
GB8511431D0
GB8511431D0 GB858511431A GB8511431A GB8511431D0 GB 8511431 D0 GB8511431 D0 GB 8511431D0 GB 858511431 A GB858511431 A GB 858511431A GB 8511431 A GB8511431 A GB 8511431A GB 8511431 D0 GB8511431 D0 GB 8511431D0
Authority
GB
United Kingdom
Prior art keywords
loud speaking
speaking telephone
telephone
loud
speaking
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
GB858511431A
Other versions
GB2174578B (en
GB2174578A (en
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB08511431A priority Critical patent/GB2174578B/en
Publication of GB8511431D0 publication Critical patent/GB8511431D0/en
Priority to IT8620181A priority patent/IT1213063B/en
Publication of GB2174578A publication Critical patent/GB2174578A/en
Application granted granted Critical
Publication of GB2174578B publication Critical patent/GB2174578B/en
Expired legal-status Critical Current

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)
GB08511431A 1985-05-04 1985-05-04 Loud speaking telephone Expired GB2174578B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB08511431A GB2174578B (en) 1985-05-04 1985-05-04 Loud speaking telephone
IT8620181A IT1213063B (en) 1985-05-04 1986-04-22 ELECTRONIC CIRCUIT FOR USE IN A TELEPHONE WITH AMPLIFIED OR HANDS-FREE RECEPTION.

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
GB8511431D0 true GB8511431D0 (en) 1985-06-12
GB2174578A GB2174578A (en) 1986-11-05
GB2174578B GB2174578B (en) 1988-11-09

Family

ID=10578696

Family Applications (1)

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

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
IT8620181A0 (en) 1986-04-22
GB2174578B (en) 1988-11-09
GB2174578A (en) 1986-11-05
IT1213063B (en) 1989-12-07

Similar Documents

Publication Publication Date Title
GB2220822B (en) Telephone
GB2174578B (en) Loud speaking telephone
GB8704778D0 (en) Telephone
AU95266S (en) Telephone handset
AU104396S (en) Telephone set
GB2211376B (en) Telephone set
AU95734S (en) Telephone set
AU100653S (en) Telephone set
CA61729S (en) Telephone
CA61088S (en) Telephone
GB2222502B (en) Telephone set
CA54233S (en) Telephone handset
CA54365S (en) Telephone handset
CA55193S (en) Telephone handset
CA55066S (en) Telephone hearing aid
CA59784S (en) Telephone set
CA57847S (en) Telephone set
CA58778S (en) Telephone set
GB2169774B (en) Microphone arrangement
CA54016S (en) Teleconferencing microphone
AU94823S (en) Telephone set
AU94721S (en) Telephone set
AU94722S (en) Telephone set
AU96225S (en) Telephone
GB8519867D0 (en) Telephone

Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20040504