ES8303858A1 - TDM conference circuit - Google Patents

TDM conference circuit

Info

Publication number
ES8303858A1
ES8303858A1 ES511385A ES511385A ES8303858A1 ES 8303858 A1 ES8303858 A1 ES 8303858A1 ES 511385 A ES511385 A ES 511385A ES 511385 A ES511385 A ES 511385A ES 8303858 A1 ES8303858 A1 ES 8303858A1
Authority
ES
Spain
Prior art keywords
signals
highest level
conference
level signal
users
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.)
Expired
Application number
ES511385A
Other languages
Spanish (es)
Other versions
ES511385A0 (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.)
Italtel SpA
Original Assignee
Italtel SpA
Italtel Societa Italiana Telecomunicazioni SpA
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 Italtel SpA, Italtel Societa Italiana Telecomunicazioni SpA filed Critical Italtel SpA
Publication of ES511385A0 publication Critical patent/ES511385A0/en
Publication of ES8303858A1 publication Critical patent/ES8303858A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
    • H04M3/568—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities audio processing specific to telephonic conferencing, e.g. spatial distribution, mixing of participants
    • H04M3/569—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities audio processing specific to telephonic conferencing, e.g. spatial distribution, mixing of participants using the instant speaker's algorithm

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)

Abstract

Known T.D.M. conference circuits supply each participant with a signal which is the sum of the signals generated by the remaining users taking part in the conference. The signals are affected by a noise ratio which is a function of the number of users. This invention provides a conference circuit which has a first means (MM) for storing the signals during a predetermined time slot of the frame according to which the PCM signals are arranged, second means (MC) for locating the highest level signal sample, third means (MI) for sending a null signal to the user generating the highest level signal sample and for sending the highest level signal sample to the other users, fourth means (MA) which enables the first, second and third means (MM, MC, MI) by way of a digital word increasing at half the digit rate of the PCM signals and fifth means (CM) for enabling the first means (MM). The noise ratio problem is mitigated as are other problems associated with the known circuits.
ES511385A 1981-04-16 1982-04-13 TDM conference circuit Expired ES8303858A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT8121227A IT1211024B (en) 1981-04-16 1981-04-16 CONFERENCE CIRCUIT FOR NUMERIC TYPE TELEPHONE SWITCHING UNITS.

Publications (2)

Publication Number Publication Date
ES511385A0 ES511385A0 (en) 1983-03-01
ES8303858A1 true ES8303858A1 (en) 1983-03-01

Family

ID=11178683

Family Applications (1)

Application Number Title Priority Date Filing Date
ES511385A Expired ES8303858A1 (en) 1981-04-16 1982-04-13 TDM conference circuit

Country Status (9)

Country Link
BR (1) BR8202162A (en)
DE (1) DE3214099A1 (en)
ES (1) ES8303858A1 (en)
FR (1) FR2504333A1 (en)
GB (1) GB2100094A (en)
GR (1) GR76042B (en)
IT (1) IT1211024B (en)
PT (1) PT74762B (en)
YU (1) YU80382A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2183965A (en) * 1985-12-10 1987-06-10 Weng Pu San Circuit structure of teleconference
JPH03166894A (en) * 1989-11-27 1991-07-18 Matsushita Electric Ind Co Ltd button telephone device
USD530619S1 (en) 2003-08-11 2006-10-24 Stokley-Van Camp, Inc. Bottle portion
USD502877S1 (en) 2003-08-11 2005-03-15 Stokely-Van Camp, Inc. Bottle portion

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190744A (en) * 1978-06-05 1980-02-26 Siemens Aktiengesellschaft Circuit arrangement and process for producing conference connections between three conference parties in a PCM time multiplex switching system
US4224688A (en) * 1978-10-30 1980-09-23 Northern Telecom Limited Digital conference circuit
DE3005739C2 (en) * 1980-02-15 1988-11-10 Nixdorf Computer Ag, 4790 Paderborn Method for controlling the transmission of PCM signals between connection points of a PCM time division multiplex telecommunications network in a conference operation and circuit arrangement for carrying out the method

Also Published As

Publication number Publication date
GR76042B (en) 1984-08-03
PT74762B (en) 1983-11-30
IT1211024B (en) 1989-09-29
IT8121227A0 (en) 1981-04-16
DE3214099A1 (en) 1982-11-18
GB2100094A (en) 1982-12-15
YU80382A (en) 1985-03-20
BR8202162A (en) 1983-03-29
ES511385A0 (en) 1983-03-01
FR2504333A1 (en) 1982-10-22
PT74762A (en) 1982-05-01

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