AU1902583A - Full-duplex speaker-phone - Google Patents

Full-duplex speaker-phone

Info

Publication number
AU1902583A
AU1902583A AU19025/83A AU1902583A AU1902583A AU 1902583 A AU1902583 A AU 1902583A AU 19025/83 A AU19025/83 A AU 19025/83A AU 1902583 A AU1902583 A AU 1902583A AU 1902583 A AU1902583 A AU 1902583A
Authority
AU
Australia
Prior art keywords
phone
full
duplex speaker
duplex
speaker
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.)
Abandoned
Application number
AU19025/83A
Inventor
Robert Morrell Ashby
Peter John Van Zant
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.)
COMDIAL CONSUMER COMMUNICATIONS CORP
Original Assignee
COMDIAL CONSUMER COMMUNICATIONS 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 COMDIAL CONSUMER COMMUNICATIONS CORP filed Critical COMDIAL CONSUMER COMMUNICATIONS CORP
Publication of AU1902583A publication Critical patent/AU1902583A/en
Abandoned 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)
AU19025/83A 1982-11-12 1983-09-12 Full-duplex speaker-phone Abandoned AU1902583A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US44086782A 1982-11-12 1982-11-12
US440867 1982-11-12

Publications (1)

Publication Number Publication Date
AU1902583A true AU1902583A (en) 1984-05-17

Family

ID=23750506

Family Applications (1)

Application Number Title Priority Date Filing Date
AU19025/83A Abandoned AU1902583A (en) 1982-11-12 1983-09-12 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
US20070071255A1 (en) * 2003-10-24 2007-03-29 Koninklijke Philips Electronics N.V. Adaptive Sound Reproduction
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
JPS59139755A (en) 1984-08-10
FR2536230A1 (en) 1984-05-18
GB2131255A (en) 1984-06-13
DE3331928A1 (en) 1984-06-14
GB8324485D0 (en) 1983-10-12

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