EP1808006A1 - Poste de conference et systeme de conference - Google Patents

Poste de conference et systeme de conference

Info

Publication number
EP1808006A1
EP1808006A1 EP05801546A EP05801546A EP1808006A1 EP 1808006 A1 EP1808006 A1 EP 1808006A1 EP 05801546 A EP05801546 A EP 05801546A EP 05801546 A EP05801546 A EP 05801546A EP 1808006 A1 EP1808006 A1 EP 1808006A1
Authority
EP
European Patent Office
Prior art keywords
network
conference
audio
station
interface
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.)
Withdrawn
Application number
EP05801546A
Other languages
German (de)
English (en)
Inventor
Rolf Meyer
Axel Haupt
Karl-Hermann DELLBRÜGGE
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.)
Sennheiser Electronic GmbH and Co KG
Original Assignee
Sennheiser Electronic GmbH and Co KG
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 Sennheiser Electronic GmbH and Co KG filed Critical Sennheiser Electronic GmbH and Co KG
Publication of EP1808006A1 publication Critical patent/EP1808006A1/fr
Withdrawn legal-status Critical Current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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer

Definitions

  • the present invention relates to a conference console for a specialized ⁇ system and a conference system.
  • Conference systems such as Sennheiser's SDC 8000 conference system or Beyer- dardic's MCW-D-200 wireless conferencing system can be operated on a wired or wireless basis.
  • delegate stations such as Sennheiser's SDC 8000 conference system or Beyer- dardic's MCW-D-200 wireless conferencing system
  • Such consoles typically include a microphone, a speaker, and a variety of controls, such as a channel selector, an option button, a microphone on / off button, and a smart card slot.
  • the chip cards are used for personalization of the station.
  • the station has an interface for the bus system of the conference system.
  • the station is usually implemented in a housing, so that both the microphone / speaker and the interface of the station in the same housing are arranged. Personalization and encryption takes place here in the respective microphone units.
  • Some conference systems also offer the possibility that in particular mobile computers can be connected to the conference system. In this case, however, a data transmission between these computers takes place via a separate network in the conference system and not via the special bus system of the stations.
  • wired methods for transmitting digital audio data such as, for example, the AES-EBU and SPDIF formats for single-channel stereo transmission and the formats ADAT (8 channels) and MADI (64 channels) for multichannel transmission methods are known. These methods are point-to-point connections, i. the audio data is exchanged between 2 stations, a transmitting station and a receiving station.
  • Analog systems with more than 2 stations and the possibility of transmitting several channels simultaneously were based on the frequency multiplex method in the past.
  • Each channel is assigned a carrier frequency, which is modulated with the audio signal. All carrier frequencies are summed and sent to all other stations. By selecting the appropriate carrier frequency in the receiver and demodulating the desired audio signal can be filtered out of the frequency mixture.
  • Digital systems have hitherto pursued a proprietary approach. What they all have in common is that the digital audio data is sent over the line in time-division multiplexing. This means that in the transmitter a serial data stream is in form a continuous data frame containing the digital samples of all audio channels. The receiver extracts the samples associated with the selected channel from the data stream. The synchronization takes place with the aid of special data words which mark the beginning of a data frame at regular intervals. Digital audio data must be transmitted synchronously. To ensure continuous transmission, the clock rate must be transmitted using techniques that recover the clock from the serial data stream. The advantage of the digital method is that high audio quality can be achieved since the quality of the audio signals is independent of the quality of the transmission path.
  • Error correction methods can be used which increase the interference safety, and it is possible to ensure a security against eavesdropping by means of encryption methods.
  • the precise characteristics of such digital systems with regard to the number of channels, word width and sampling rate of the digital audio data, use of error correction methods and encoding methods are not standardized and are adapted to the respective requirements of a system.
  • the effort for the creation of such a system is not insignificant, since all components such as cabling, kaus ⁇ driver, signal processing circuits to the application software must be redeveloped.
  • a conference console for a conference system comprising an audio unit for converting audio signals into network-specific signals, a network interface for transmitting the network-specific signals to an external network and for receiving network-specific signals.
  • the network identifier stored in the network identification unit represents an internet protocol address.
  • the audio unit is designed for recording and reproducing audio signals.
  • the conference call station has control elements for controlling the conference call station.
  • the invention is based on the idea of coupling stations using a standard network and transmitting the digitized audio data over this network.
  • the advantages of digital audio transmission (high audio quality, interference immunity, integration capability of the hardware) are combined with the advantages of network transmission (manufacturer-independent components such as switches, available technology, available protocols). Special procedures ensure the continuity of the transmission of the digital audio data on a network that is not designed for synchronous data transmission.
  • the system thus consists of a plurality of audio stations which have a network connection and are interconnected using standard components 0.
  • Each audio station preferably has a microphone and a loudspeaker for recording and reproducing the audio information.
  • the analog microphone signal is converted to a digital signal and the digital speaker signal is converted to an analog signal, and data information compatible with the network standard used is generated.
  • microcontrollers are used here which have a suitable network interface and the corresponding software functions, but it is also conceivable to use programmable logic devices (FPGA) or the use of standard microcontrollers to which are connected switch circuits. Modifications of the described audio station are possible in that an audio station has only one microphone or only one loudspeaker.
  • An audio station can be extended by display elements (LED, LCD) and by function keys.
  • the audio stations are connected via commercially available standard components such as switches and / or routers. Since several audio stations are connected to each switch or router, depending on the design, this results in a star-shaped cabling of the system.
  • FIG. 1 shows a conference system according to a first exemplary embodiment
  • FIG. 2 shows a conference system according to a second exemplary embodiment
  • FIG. 3 shows a more detailed view of the audio stations according to the second embodiment
  • Figure 4 shows a schematic representation of an audio station according to the second embodiment.
  • Figure 1 shows a schematic representation of a system according to a first embodiment of the invention.
  • three audio stations AS are connected to a first switch S1.
  • This switch S1 is in turn connected via a second switch S2 to a central Z.
  • FIG. 1 thus shows a system with star-connected audio stations and further components.
  • FIG. 2 shows a system according to a second exemplary embodiment. While the system according to the first embodiment has been formed from star-shaped audio stations, the system according to the second exemplary embodiment is formed by coupling audio stations AS in a series circuit. For this purpose, standard switches S are integrated in the audio stations. For this purpose, the originally star-shaped topology is transformed into a serial structure. Thus, each audio station AS has an integrated network switch S. Each audio station AS modified in this manner thus has 2 or more network connections, which makes it possible for the audio stations AS according to FIG. 2 to be connected to one another, one of the audio stations being connected to the central unit Z.
  • FIG. 3 shows a more detailed view of the connection of the audio stations according to the second embodiment of Figure 2.
  • Each audio station AS has an analog input a_in to which eg a microphone can be connected, and can an analog output a_out for connecting an audio amplifier or a speaker or Headphone.
  • This system can be used, for example, to set up discussion systems or conference systems, with the audio stations then serving as conference call stations, but it is also generally suitable for applications in which various audio signals are to be transported over a network.
  • the connection of the audio stations under ⁇ each other is realized with an Ethemet connection. For example, category 5 twisted pair cables can be used as the physical medium. Since a collision-free network can best meet the timing requirements of real-time data transmission, it is preferable to use a switched Ethernet network with bidirectional links.
  • the special feature of this system is that in each audio station AS an Ethernet switch is integrated and thus a standard network technology that is designed for star topology, for the series connection of Audiostatio ⁇ nen can be used.
  • the switch functionality can also be simulated by using a microcontroller with 2 integrated Ethernet interfaces and the software of the controller takes over the addressing functions of the switch.
  • FIG. 4 shows a more detailed structure of an audio station AS according to FIGS. 2 and 3.
  • Each audio station AS has a transmitting unit and a receiving unit.
  • the transmitting unit designates the functional blocks for feeding data into the network
  • the receiving unit denotes the functional blocks for receiving data from the network.
  • An interface converter 5, a microcontroller 7 and Ethemetswitches 9 are used bidirectionally.
  • Analog data is fed via the analog input 1 into the audio station AS.
  • the amplified analog audio signal is supplied to the analog / digital converter 3 via an amplifier 2, which can be designed to be adjustable.
  • a limiter in the amplifier 2 prevents overriding of the analog / digital converter input.
  • the analog / digital converter may, for example, have a resolution of 20 bits.
  • the converter generates from the analog audio signal a digital data stream 4, which is supplied to an interface converter 5.
  • the interface converter 5 converts the audio samples included in the serial data stream into a data format suitable for transmission over an Ethemet network.
  • the audio samples are forwarded to the microcontroller 7 via a parallel interface 6.
  • the microcontroller 7 loads the data words into a buffer and forms from a predetermined number of data words a data block which is embedded in an Ethernet frame according to IEEE 802.3.
  • an interface 8 eg the Mll standard can correspond to the Ethemetframe to the connection of a 3-port switch 9, at the other two ports via a transformer 10, the RJ45 socket 11 is connected, which establishes the physical connection to the network 12.
  • each audio station AS is assigned an internet protocol address by a central computer in the network. Alternatively, each audio station may have a fixed IP address.
  • the Ethemetframes coming or received from the network arrive via the RJ45 socket 13 and a transmitter 14 to the switch 9, in the switch 9 it is decided, based on the destination address or IP address contained in the Ethemet frame, whether the frame is intended for this audio station AS , If this is not the case, the frame is fed back into the network via the transmitter 10 and the connection 11, otherwise the frame passes via the interface 8 to the microcontroller 7.
  • the microcontroller takes the data words from the frame and sends them via the parallel Interface 6 to the interface converter 5.
  • the interface converter generates from the data words a memoril ⁇ len data stream 15, which is converted in the digital / analog converter 16 into an analog audio signal.
  • the analog audio signal is amplified 17 and provided at the analog output 18.
  • a switched ethernet network with bidirectional connection is used.
  • a transmission protocol for the network connection for example, UDP can be used.
  • the audio stations AS send data using the broadcast address and a port address or using multicast addresses to all other audio stations.
  • the conversion of the analog audio signal into digital samples is carried out in the A / D converter.
  • the special feature is that due to the use of the interface converter, it is possible to use any A / D converter intended for use in the audio sector with different sampling rates and resolutions.
  • the interface converter acts as a clock in the audio station. It stores the digital samples coming from the A / D converter and transmits them in regular intervals to the microcontroller.
  • the interface converter can be used to specify how many of the most significant bits of the samples are used for transmission over the network. Thus, the maximum possible number of audio channels can be set depending on the required audio quality of the transmission system.
  • the transmission of this information together with the audio data to the receiver stations allows an automatic adaptation of the receiver to the setting made on the transmission side.
  • the temporal transmission behavior of the system depends on the size of the data packets sent over the network.
  • the interface converter With the intermediate storage of the data, it is possible to set the size of the data packets as desired and thus to optimize the temporal transmission behavior.
  • the system is able to send audio data to multiple audio stations simultaneously.
  • broadcast addresses are used for the transmission of data, so that the data packets can be received by all other connected stations.
  • different port numbers are assigned, which are known to each receiver.
  • multicast addresses which are different for each audio channel to be transmitted. The selection of which channel is to be received at which audio station is made in the receiver by logging on to one of the multicast groups.
  • the audio station can be easily equipped with 2 or more Ethernet interfaces. This allows you to connect stations with short connection cables and, in the case of more than 2 interfaces, the connection of further devices, such as a cable. Computer with Ethemet interface to the audio station.
  • the microcontroller For receiving audio data, the microcontroller selects the port assigned to the audio channel to be received. In regular, from Interface converter predetermined time intervals, the audio data from the microcontroller are transmitted to the interface converter. Since the clocks in the receiving audio stations are not synchronized with the clock in the transmitting audio station, functions are implemented in the receivers which compensate the possibly existing frequency differences of the audio stations.
  • the interface converter is able to adjust the size of the buffer and pass the audio samples to the D / A converter at the correct resolution, based on the information available from the transmitting audio station.
  • a system of coupled audiostations can be used as the audio conferencing system.
  • the audio stations are designed as conference telephones and have a microphone and can have a sound speaker for recording and reproducing the audio information.
  • a connection for headphones or headsets may be provided.
  • the power supply of the audio stations can be carried out, for example, as a remote power supply via the network connection. Since the network transmits not only audio information but arbitrary data, far-reaching additional functions are possible in an audio station.
  • the audio stations can be equipped with function keys that can be used for a variety of signaling tasks in the network. For example, with centralized control of the conferencing system, each station can request a permission to speak, and the microphone is then turned on by the controller in the event that a transmission channel is idle.
  • the microphone units can be equipped with a chip card be equipped to tenters that allows the operation of the station only those persons who have a suitably programmed chip card. Information on the chip card can be evaluated both locally in the station and sent over the network to a central controller. Application could find this form of access authorization, for example, in the voting system described below, which can also be implemented using the audio stations.
  • the audio stations have one or more analog inputs to which, for example, external signal sources for recording voice or music can be connected. Furthermore, one or more analogue outputs are available for connecting headphones or analogue recording devices.
  • An additional network port on the audio station allows direct data connection between a laptop and the station.
  • This additional network connection can be designed as an Ethernet interface, as a WLAN interface and / or as a Bluetooth interface.
  • the first embodiment of the station is a delegate station, by means of which a delegate can follow a conference and, if necessary, can speak to the other participants in the conference by pressing the on / off switch for the microphone in the station.
  • Another station is a station for interpreters, who simultaneously dol ⁇ the respective contributions of the delegates in the desired languages. The simultaneously interpreted contributions of the delegates can either be retrieved by all delegates or the retrievable language can be specified in advance during personalization.
  • the conference system can be largely controlled. For example, a delegate may be interrupted if his contribution extends beyond the speaking time made available to him, for example by stopping or interrupting the transmission of the audio signals becomes.
  • the presidential station can be configured to unlock the station which is assigned to the subsequent speaker.
  • the presidential station may also be adapted to prevent direct communication between two delegates.
  • the intercom stations can be designed either as a delegate unit, as a presidential station or as an interpreter unit.
  • a president's station has additional functions with which the course of a conference can be controlled. In this case, certain function keys come into play, with which, for example, the microphones of other audio stations can be switched on or off.
  • An interpreter unit has certain functions which enable interception of an audio channel and simultaneous speech on another audio channel.
  • an audio conference system can be integrated into a complete media technology system.
  • an external interpreter system or infrared interpreter system Audio stations without microphone and loudspeaker, but with integrated RF receiver stage are used for the operation of wireless microphones.
  • the same network can be used to control presentation technology in a complete media-technical system using network-capable projectors and projection screens.
  • the existing media control can be used, so that a special control unit tuned only to the audio conference system can be dispensed with.
  • WLAN Wireless Local Area Network
  • the network for the conference system is based on a wireless local area network WLAN.
  • a wireless local area network WLAN refers to a wireless local radio network, which is usually based on the standard of the IEEE 802.11 family.
  • WLAN networks operate in an infrastructure mode in which one or more base stations, ie wireless access points, control communication between the clients in the network. The transport of data usually takes place via the various access points.
  • an ad hoc network is also possible in which the clients communicate directly with each other.
  • Such an ad hoc network represents a wireless network architecture that is established between two or more mobile terminals without a fixed infrastructure.
  • Each client, that each conference call station is assigned address IP, for example, from a central computer in the WiFi network a Internetpro 'protocol.
  • IP address allows logical addressing of computers or network elements in IP networks such as the Internet. These IP addresses are entered in the source and destination address fields for each IP packet, ie each IP packet contains information about the address of the sender and the recipient.
  • version 4 of the Internet Protocol IPv4 allows 32-bit IP addresses to be used, separated by four dots.
  • Each 32-bit IP address is split into a network part and a device part (host part). In the simplest case, the first 16 bits represent the network part and the last 16 bits represent the device part.
  • the sixth version of the IP protocol is now based on the use of 128-bit addresses.
  • IP addresses can either be permanently assigned to a network element, or they can be allocated dynamically given a corresponding dial-in. Within private networks, the IP address itself can be assigned. A connection of all computers with a correspondingly assigned IP address in a private network with computer on the Internet is carried out via a Network Address Translation NAT.
  • IP addresses can be assigned when a network element is registered in a network via a corresponding network server.
  • a range of iP addresses can be defined on the network server from which additional network elements can be assigned a corresponding IP address.
  • such an address does not constitute a fixed IP address, but it only applies for the period during which the network element is registered in the network.
  • the network devices may be identified, for example, via their MAC address (Media Access Control) and receive a permanent IP address.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Telephonic Communication Services (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un poste de conférence pour un système de conférence. Le poste de conférence selon l'invention comprend une unité audio servant à convertir des signaux audio en signaux spécifiques du réseau, une interface de réseau servant à envoyer les signaux spécifiques du réseau à un réseau externe et à recevoir des signaux spécifiques du réseau d'un réseau externe, ainsi qu'une unité d'identification de réseau servant à enregistrer un identificateur de réseau.
EP05801546A 2004-10-28 2005-10-28 Poste de conference et systeme de conference Withdrawn EP1808006A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004052487A DE102004052487B4 (de) 2004-10-28 2004-10-28 Konferenz-Sprechstelle und Konferenzsystem
PCT/EP2005/011539 WO2006045614A1 (fr) 2004-10-28 2005-10-28 Poste de conference et systeme de conference

Publications (1)

Publication Number Publication Date
EP1808006A1 true EP1808006A1 (fr) 2007-07-18

Family

ID=35677661

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05801546A Withdrawn EP1808006A1 (fr) 2004-10-28 2005-10-28 Poste de conference et systeme de conference

Country Status (4)

Country Link
US (1) US20080123563A1 (fr)
EP (1) EP1808006A1 (fr)
DE (1) DE102004052487B4 (fr)
WO (1) WO2006045614A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE202008011572U1 (de) * 2008-08-29 2009-01-02 Boos, Herbert Audio-visuelles Kommunikations-system zum Einsatz in großflächigen kommerziellen Anlagen
CN105359499B (zh) 2013-07-11 2019-04-30 哈曼国际工业有限公司 用于数字音频会议工作流管理的系统和方法

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Also Published As

Publication number Publication date
DE102004052487B4 (de) 2007-09-06
DE102004052487A1 (de) 2006-05-04
WO2006045614A1 (fr) 2006-05-04
US20080123563A1 (en) 2008-05-29

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