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GB8324485D0 - Full-duplex speaker phone - Google Patents

Full-duplex speaker phone

Info

Publication number
GB8324485D0
GB8324485D0 GB838324485A GB8324485A GB8324485D0 GB 8324485 D0 GB8324485 D0 GB 8324485D0 GB 838324485 A GB838324485 A GB 838324485A GB 8324485 A GB8324485 A GB 8324485A GB 8324485 D0 GB8324485 D0 GB 8324485D0
Authority
GB
United Kingdom
Prior art keywords
full
speaker phone
duplex speaker
duplex
phone
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.)
Withdrawn
Application number
GB838324485A
Other versions
GB2131255A (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.)
AMERICAN TELECOMM
American Telecommunications Corp
Original Assignee
AMERICAN TELECOMM
American Telecommunications 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 AMERICAN TELECOMM, American Telecommunications Corp filed Critical AMERICAN TELECOMM
Publication of GB8324485D0 publication Critical patent/GB8324485D0/en
Publication of GB2131255A publication Critical patent/GB2131255A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H04M9/087—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 different frequency bands for transmitting and receiving paths ; using phase shifting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephone Function (AREA)
GB08324485A 1982-11-12 1983-09-13 Full-duplex speaker phone Withdrawn GB2131255A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US44086782A 1982-11-12 1982-11-12

Publications (2)

Publication Number Publication Date
GB8324485D0 true GB8324485D0 (en) 1983-10-12
GB2131255A GB2131255A (en) 1984-06-13

Family

ID=23750506

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08324485A Withdrawn GB2131255A (en) 1982-11-12 1983-09-13 Full-duplex speaker phone

Country Status (5)

Country Link
JP (1) JPS59139755A (en)
AU (1) AU1902583A (en)
DE (1) DE3331928A1 (en)
FR (1) FR2536230A1 (en)
GB (1) GB2131255A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3606516C1 (en) * 1986-02-28 1987-06-19 Telefonbau & Normalzeit Gmbh Circuit arrangement for hands-free and loudspeaker devices in telephone sets
JPH0683305B2 (en) * 1987-03-12 1994-10-19 日本電気株式会社 Loud phone
GB2246055A (en) * 1990-04-06 1992-01-15 Bsb Electronics Limited Duplex audio communication system
JP2007509558A (en) * 2003-10-24 2007-04-12 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Adaptive audio playback
FR2896650B1 (en) * 2006-01-23 2008-03-14 Cogelec Soc Par Actions Simpli SIMULTANEOUS BIDIRECTIONAL INTERCOM SYSTEM, PLATINUM, COMBIN AND METHOD FOR SAID SYSTEM

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3585311A (en) * 1969-09-02 1971-06-15 Bell Telephone Labor Inc Speech processor using contiguous multiband center-clipping
US3699271A (en) * 1970-11-16 1972-10-17 Bell Telephone Labor Inc Speech processor using multiband controlled center clipping

Also Published As

Publication number Publication date
DE3331928A1 (en) 1984-06-14
AU1902583A (en) 1984-05-17
GB2131255A (en) 1984-06-13
JPS59139755A (en) 1984-08-10
FR2536230A1 (en) 1984-05-18

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)