FR2334244A1 - Simultaneous multi subscriber PCM circuit - reduces computation time using sequential addition and subtraction operations at constant rate - Google Patents

Simultaneous multi subscriber PCM circuit - reduces computation time using sequential addition and subtraction operations at constant rate

Info

Publication number
FR2334244A1
FR2334244A1 FR7537102A FR7537102A FR2334244A1 FR 2334244 A1 FR2334244 A1 FR 2334244A1 FR 7537102 A FR7537102 A FR 7537102A FR 7537102 A FR7537102 A FR 7537102A FR 2334244 A1 FR2334244 A1 FR 2334244A1
Authority
FR
France
Prior art keywords
constant rate
computation time
sequential addition
simultaneous multi
subtraction operations
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
FR7537102A
Other languages
French (fr)
Other versions
FR2334244B1 (en
Inventor
Jean-Luc Calvez
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.)
Laboratoire Central de Telecommunications SA
Original Assignee
Laboratoire Central de Telecommunications SA
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 Laboratoire Central de Telecommunications SA filed Critical Laboratoire Central de Telecommunications SA
Priority to FR7537102A priority Critical patent/FR2334244A1/en
Priority to BE2055501A priority patent/BE848969R/en
Priority to ES453929A priority patent/ES453929A1/en
Publication of FR2334244A1 publication Critical patent/FR2334244A1/en
Application granted granted Critical
Publication of FR2334244B1 publication Critical patent/FR2334244B1/fr
Granted 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
    • H04M3/561—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities by multiplexing

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)

Abstract

A communications circuit uses PCM techniques allowing simultaneous use by more than two subscribers. The design is intended to minimise the computation required and the time involved in the various operations. The switching, carried out at a constant repetition rate, is to an input memory where the non-linear subscriber codes are fed in as groups. The codes are converted to a linear form in an expansion circuit. Computation is by an add and subtract circuit. Each memory group is read twice in succession, alternate subtraction and addition occurring during the two periods. Two registers are employed, one being inhibited during substraction and reset to zero at the start of the addition phase.
FR7537102A 1975-12-04 1975-12-04 Simultaneous multi subscriber PCM circuit - reduces computation time using sequential addition and subtraction operations at constant rate Granted FR2334244A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR7537102A FR2334244A1 (en) 1975-12-04 1975-12-04 Simultaneous multi subscriber PCM circuit - reduces computation time using sequential addition and subtraction operations at constant rate
BE2055501A BE848969R (en) 1975-12-04 1976-12-02 CONFERENCE CIRCUIT FOR MIC SWITCHING NETWORK
ES453929A ES453929A1 (en) 1975-12-04 1976-12-03 A circuit for conference for a mic shuttering mesh. (Machine-translation by Google Translate, not legally binding)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7537102A FR2334244A1 (en) 1975-12-04 1975-12-04 Simultaneous multi subscriber PCM circuit - reduces computation time using sequential addition and subtraction operations at constant rate

Publications (2)

Publication Number Publication Date
FR2334244A1 true FR2334244A1 (en) 1977-07-01
FR2334244B1 FR2334244B1 (en) 1979-07-13

Family

ID=9163306

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7537102A Granted FR2334244A1 (en) 1975-12-04 1975-12-04 Simultaneous multi subscriber PCM circuit - reduces computation time using sequential addition and subtraction operations at constant rate

Country Status (3)

Country Link
BE (1) BE848969R (en)
ES (1) ES453929A1 (en)
FR (1) FR2334244A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004307A1 (en) * 1978-03-16 1979-10-03 Siemens Aktiengesellschaft Process for the establishment of conference connections in a PCM-time multiplex switching system
EP0005833A1 (en) * 1978-06-05 1979-12-12 Siemens Aktiengesellschaft Method and circuit for establishing conference connections in a PCM-time multiplex switching system
FR2472318A1 (en) * 1979-12-18 1981-06-26 Telecommunications Sa Telephone conference system - adds samples of selected subscriber channels and retransmits and distributes sum to subscribers as second order digital signal
EP0120552A1 (en) * 1983-01-18 1984-10-03 Plessey Overseas Limited Conference bridge

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004307A1 (en) * 1978-03-16 1979-10-03 Siemens Aktiengesellschaft Process for the establishment of conference connections in a PCM-time multiplex switching system
EP0005833A1 (en) * 1978-06-05 1979-12-12 Siemens Aktiengesellschaft Method and circuit for establishing conference connections in a PCM-time multiplex switching system
FR2472318A1 (en) * 1979-12-18 1981-06-26 Telecommunications Sa Telephone conference system - adds samples of selected subscriber channels and retransmits and distributes sum to subscribers as second order digital signal
EP0120552A1 (en) * 1983-01-18 1984-10-03 Plessey Overseas Limited Conference bridge

Also Published As

Publication number Publication date
BE848969R (en) 1977-06-02
FR2334244B1 (en) 1979-07-13
ES453929A1 (en) 1977-11-01

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Legal Events

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