ES476286A1 - Un puente de conferencia telefonica con modulacion delta di-gital - Google Patents

Un puente de conferencia telefonica con modulacion delta di-gital

Info

Publication number
ES476286A1
ES476286A1 ES476286A ES476286A ES476286A1 ES 476286 A1 ES476286 A1 ES 476286A1 ES 476286 A ES476286 A ES 476286A ES 476286 A ES476286 A ES 476286A ES 476286 A1 ES476286 A1 ES 476286A1
Authority
ES
Spain
Prior art keywords
cvsd
digital
conference
telephone conference
conference circuit
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
ES476286A
Other languages
English (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.)
Nokia Spain SA
Original Assignee
Alcatel Espana 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 Alcatel Espana SA filed Critical Alcatel Espana SA
Publication of ES476286A1 publication Critical patent/ES476286A1/es
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
    • H04M3/561—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)
  • Telephonic Communication Services (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

1.Un puente de conferencia telefónica con modulación delta digital que comprende: - primeros elementos para almacenar separadamente en sucesión una pluralidad de diferentes bits adyacentes de una pluralidad de flujos de bits de entrada con origen cada uno en diferentes teléfonos, pudiendo cada pluralidad de bits tener una pluralidad de combinaciones de bits diferentes, estando asignada cada una de dichas combinaciones de bits diferentes a un número de pendiente predeterminada; y - segundos elementos acoplados a los primeros elementos para recibir secuencialmente de cada uno de dicha pluralidad de flujos de bits de entrada la mencionada pluralidad de bits, para sumar secuencialmente las combinaciones de bits binarias determinadas por dicho número de pendiente asignado a cada pluralidad de bits recibida para llegar a un total de dichos números de pendiente, para restar secuencialmente las combinaciones de bit binarias determinadas por dicho número de pendiente asignado a cada pluralidad de bits recibida para llegar a una diferencia de dicha pendiente a partir de dicho total de números de pendiente de dicha pluralidad de flujos de bits de entrada que se originan en uno determinado de los diferentes teléfonos, y para proporcionar una pluralidad de flujos de bits de conferencia de salida cada uno para uno diferente de los mencionados teléfonos.
ES476286A 1977-12-22 1978-12-22 Un puente de conferencia telefonica con modulacion delta di-gital Expired ES476286A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/863,377 US4163871A (en) 1977-12-22 1977-12-22 Digital CVSD telephone conference circuit

Publications (1)

Publication Number Publication Date
ES476286A1 true ES476286A1 (es) 1980-08-16

Family

ID=25341007

Family Applications (1)

Application Number Title Priority Date Filing Date
ES476286A Expired ES476286A1 (es) 1977-12-22 1978-12-22 Un puente de conferencia telefonica con modulacion delta di-gital

Country Status (3)

Country Link
US (1) US4163871A (es)
JP (1) JPS54136108A (es)
ES (1) ES476286A1 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112634915A (zh) * 2020-12-02 2021-04-09 中国电子科技集团公司第三十研究所 可软件实现的用于cvsd编码的数字压扩方法、数字语音通信设备、计算机程序及介质

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5516520A (en) * 1978-07-20 1980-02-05 Sony Corp Digital signal mixer
US4230908A (en) * 1979-01-22 1980-10-28 Plessey Canada Limited Telephone summing circuit
US4359603A (en) * 1980-08-13 1982-11-16 Rockwell International Corporation CVSD Multiple conference system
US5353351A (en) * 1992-06-09 1994-10-04 At&T Bell Laboratories Secure teleconferencing
CA2143591C (en) 1994-04-29 1999-01-26 David N. Horn Teleconferencing audio bridge
US20040190701A1 (en) * 2003-03-28 2004-09-30 Versatel Networks Inc. Apparatus and method for a distributed conference bridge

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885100A (en) * 1974-05-31 1975-05-20 Bell Telephone Labor Inc Six-port conference amplifier circuit
US3979676A (en) * 1974-10-21 1976-09-07 International Standard Electric Corporation Delta modulation apparatus
US3970797A (en) * 1975-01-13 1976-07-20 Gte Sylvania Incorporated Digital conference bridge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112634915A (zh) * 2020-12-02 2021-04-09 中国电子科技集团公司第三十研究所 可软件实现的用于cvsd编码的数字压扩方法、数字语音通信设备、计算机程序及介质

Also Published As

Publication number Publication date
US4163871A (en) 1979-08-07
JPS54136108A (en) 1979-10-23

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