WO2002049336A1 - Verfahren und vorrichtung zur realisierung von sprachkonferenzen - Google Patents
Verfahren und vorrichtung zur realisierung von sprachkonferenzen Download PDFInfo
- Publication number
- WO2002049336A1 WO2002049336A1 PCT/EP2001/014435 EP0114435W WO0249336A1 WO 2002049336 A1 WO2002049336 A1 WO 2002049336A1 EP 0114435 W EP0114435 W EP 0114435W WO 0249336 A1 WO0249336 A1 WO 0249336A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conference
- participants
- bus
- switching network
- kki
- Prior art date
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
-
- 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
- H04M3/562—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities where the conference facilities are distributed
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/02—Arrangements for interconnection not involving centralised switching involving a common line for all parties
- H04M9/022—Multiplex systems
- H04M9/025—Time division multiplex systems, e.g. loop systems
Definitions
- the invention relates to a method for realizing voice conferences in a switching network with a number of active conference participants who are connected to the
- Switching network are connected and a device for performing the method.
- conference modules (2 x SIGPS + SIGPST) are used to implement voice conferences.
- all participants are routed to this conference module in a star shape so that the useful channel information of the individual conference participants can be calculated.
- Fig. 1 shows schematically the structure of the conference
- Fig. 2 shows schematically the structure of a conference node.
- the individual conference participants KTi ... KT N are connected to their conference nodes KKi -KKN.
- the conference is calculated in the conference node.
- These nodes are implemented on the subscriber modules in the form of signal processor programs DSP.
- the conference nodes in turn are connected to one another with a conference bus KB.
- the heart of the conference is the part in the conference node in which the user channel data of the conference participants are mixed. For this, reference is made to FIG. 2.
- the calculation is designed so that all participants on the conference buses always send and receive at the same levels.
- the useful signal for the k-th conference participant KT k is extracted from the conference buses with the corresponding weighting of the number N of participants on the bus, added and passed on to the participant KT.
- the signal of the participant KT k is added to the conference bus with the appropriate weighting, so that the individual participants who are already available on the bus are all present with the same weighting. So that the maximum level on the conference bus is not exceeded, the bus signal in each conference node must be adapted accordingly.
- two types of conference buses are available in the known switching system MKS. They differ in the voice quality that they can transmit and in the network load that they produce. The type of conference bus also influences the structure of the programs in the individual conference nodes.
- 8-bit PCM values (A-Law) are transmitted via the 64 kbit MTS connection.
- a sample rate of 8 kHz results from the transmission rate and the 8 bit words.
- the user information of all participants must be adapted to this 8 kHz structure. The advantage is good voice quality, but this is offset by a correspondingly high network load.
- the 32 kbit DCDM conference bus connects the conference nodes via a standard DCDM connection.
- PCM values are formed from the DCDM samples using a transcoding algorithm. These transcoded PCM values are also available with a sample rate of 32 kHz. To calculate the conference, the user information of all participants must be adapted to this 32 kHz structure. The advantage is a small network load, but this is offset by poorer voice quality.
- the individual conference nodes must be informed of their position on the conference bus (k and). This position can be changed dynamically. If a participant gets out of a conference, all conference nodes must be informed of a new position.
- the conference nodes are implemented directly on the signal processors (DSP) of the participant modules.
- DSP signal processors
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/450,405 US20040064505A1 (en) | 2000-12-14 | 2001-12-08 | Method and device for setting up voice conferences |
PL01362458A PL362458A1 (en) | 2000-12-14 | 2001-12-08 | Method and device for setting up voice conferences |
IL15639301A IL156393A0 (en) | 2000-12-14 | 2001-12-08 | Method and device for setting up voice conferences |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10062342A DE10062342A1 (de) | 2000-12-14 | 2000-12-14 | Verfahren und Vorrichtung zur Realisierung von Sprachkonferenzen |
DE10062342.5 | 2000-12-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002049336A1 true WO2002049336A1 (de) | 2002-06-20 |
Family
ID=7667139
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/014435 WO2002049336A1 (de) | 2000-12-14 | 2001-12-08 | Verfahren und vorrichtung zur realisierung von sprachkonferenzen |
Country Status (6)
Country | Link |
---|---|
US (1) | US20040064505A1 (de) |
DE (1) | DE10062342A1 (de) |
IL (1) | IL156393A0 (de) |
PL (1) | PL362458A1 (de) |
RU (1) | RU2272364C2 (de) |
WO (1) | WO2002049336A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100397855C (zh) * | 2003-04-30 | 2008-06-25 | 华为技术有限公司 | 一种分布式混音处理方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7509398B2 (en) * | 2005-01-13 | 2009-03-24 | International Business Machines Corporation | System and method for protocol independent access and invocation of web services |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5898676A (en) * | 1995-07-20 | 1999-04-27 | Alcatel N.V. | Method, communication system and conference unit for carrying out conferences |
US5920546A (en) * | 1997-02-28 | 1999-07-06 | Excel Switching Corporation | Method and apparatus for conferencing in an expandable telecommunications system |
WO2000072560A1 (en) * | 1999-05-21 | 2000-11-30 | Truechat, Inc. | Teleconferencing bridge with edgepoint mixing |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH575692A5 (de) * | 1974-06-17 | 1976-05-14 | Hasler Ag | |
US4054757A (en) * | 1976-12-13 | 1977-10-18 | International Standard Electric Corporation | Conference circuit using PCM techniques |
DE3669247D1 (de) * | 1985-09-27 | 1990-04-05 | Siemens Ag | Verfahren zum aufschalten zusaetzlicher fernsprechwege und tonsignale auf eine zwischen zwei teilnehmern bestehende fernsprechverbindung. |
JP3308563B2 (ja) * | 1991-07-15 | 2002-07-29 | 株式会社日立製作所 | 多地点テレビ会議システム |
GB2284968A (en) * | 1993-12-18 | 1995-06-21 | Ibm | Audio conferencing system |
-
2000
- 2000-12-14 DE DE10062342A patent/DE10062342A1/de not_active Withdrawn
-
2001
- 2001-12-08 PL PL01362458A patent/PL362458A1/xx not_active Application Discontinuation
- 2001-12-08 IL IL15639301A patent/IL156393A0/xx unknown
- 2001-12-08 US US10/450,405 patent/US20040064505A1/en not_active Abandoned
- 2001-12-08 WO PCT/EP2001/014435 patent/WO2002049336A1/de active Application Filing
- 2001-12-08 RU RU2003120514/09A patent/RU2272364C2/ru not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5898676A (en) * | 1995-07-20 | 1999-04-27 | Alcatel N.V. | Method, communication system and conference unit for carrying out conferences |
US5920546A (en) * | 1997-02-28 | 1999-07-06 | Excel Switching Corporation | Method and apparatus for conferencing in an expandable telecommunications system |
WO2000072560A1 (en) * | 1999-05-21 | 2000-11-30 | Truechat, Inc. | Teleconferencing bridge with edgepoint mixing |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100397855C (zh) * | 2003-04-30 | 2008-06-25 | 华为技术有限公司 | 一种分布式混音处理方法 |
Also Published As
Publication number | Publication date |
---|---|
RU2003120514A (ru) | 2005-02-27 |
RU2272364C2 (ru) | 2006-03-20 |
PL362458A1 (en) | 2004-11-02 |
IL156393A0 (en) | 2004-01-04 |
US20040064505A1 (en) | 2004-04-01 |
DE10062342A1 (de) | 2002-07-11 |
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