JP4176637B2 - Data conferencing method, apparatus and system - Google Patents

Abstract

Geographically distributed conference sites each have a telephone receiver and a dataconferencing appliance 112, 122 connected to a shared voice call network 146. Each site also has a display device 124 for displaying images comprised of image data produced by an image source. The dataconferencing appliance 112, 122 is connected to a data network 132 that links the sites independently of the voice call network 146. To initiate a dataconference session between the sites, a voice call session is first established between the telephone receivers via the voice call network 146. An access negotiation procedure implemented in software or hardware of the dataconferencing appliance 112, 122 is then manually initiated to identify a network device access code and communicate it to at least a second one of the sites within the voice call session. The network device access code is used to establish a data communication session via the data network 132 for convenient transmission of image data between the sites.

Description

  The present invention relates to a multi-media conference call method and apparatus, and more particularly to an improved method, apparatus and system for establishing a data conference session between two or more geographically remote conference sites utilizing distributed control. It is about.

  Currently, audio and visual presentation conferences between remote conference sites are time consuming, difficult and expensive. A known attempt is video conferencing, which includes two or more video conferencing equipment sold by the Picture Tel Corporation of Andover, Massachusetts, USA. This device is expensive and is optimized to support video of all human-to-human motion. Since this apparatus uses an expensive ISDN line for communication, the total solution cost is high and the versatility of the system is reduced. These video conferencing devices depend on the number of telephones, and the number of telephones may not be listed, i.e. it is difficult to determine the number of telephones, which complicates the setup of video conferencing. End up. In many cases, full mobile video is not required for effective meetings. Often, a single conference call and a shared presentation are sufficient.

  What proponents typically do is display computer-generated visual aids or images. Video conferencing systems do not connect table tops that integrate presentation images and video transmission. Rather, the video conferencing system is appropriately adjusted so that the video camera faces the screen on which the presentation image is displayed, for example via a computer display or multimedia projector.

  It is also known to share presentation material between a local site and a remote site over a computer network using both a telephone and a computer when conducting an audio conference call. In this known method, individual connections are established manually for voice calls (via the telephone network) and data or image transmission (via the computer network). Initially, at the local site, the telephone number of the remote site is dialed on the speakerphone to establish an audio connection. Next, in order to establish a shared presentation connection, the user at the local site needs to enter the internet protocol address (IP address) of the remote computer to establish a data network connection. Regular phone numbers can be easily entered and communicate with remote people, but IP addresses are often unknown or often changed and difficult to know. An IP address is dynamically assigned to a computer in a network domain or organization subnet via Dynamic Host Configuration Protocol (DHCP), and is valid only within the network domain or organization subnet, and may be a proxy server or network address translation (NAT). It cannot be accessed directly from outside due to the use of a server. Data network connections for sharing presentations are blocked by the firewall when transmitting data or images over the Internet, unless the firewall is specifically configured. Accordingly, there is a need for an improved method and apparatus for establishing a data conference session.

  Other data conferencing systems use a centralized computer server to set up and manage audio and data connections. For example, U.S. Pat. No. 5,916,302 to Dunn et al. Uses a Public Switched Telephone Network (PSTN) for the audio portion of a data conference and a centralized location accessible by a computer network to transmit the video or image portion of the data conference. The use of type computer servers. Participants using a system such as Dunn access a server computer and download images using Web browser software on a personal computer. The server computer's network address, or Internet domain name, is sent to all participants, and each participant must manually enter the web browser to upload or access the data components of the data conference. Manually entering the network address of the server is cumbersome and prone to error, and is difficult to do for many conference participants. In this method, after the data conference ends, the images remain on the central computer server and the participants' computers, which is undesirable.

  Waston U.S. Pat. No. 6,233,605 describes a narrow bandwidth remote conferencing system that uses PSTN for audio components and a network computer for visual components. Prior to the conference, data representing the visual image is transmitted to the computer of the conference participant. During the meeting, one participant periodically sends a selection signal to all computers to select and display the transmitted image. This selection signal and conference call are conducted over a single voice grade telephone channel. This system requires a distributed transmission of the presentation image prior to the conference call, avoids manually interacting with each server's computer to initialize the image data download without addressing the desired participants. ing. In addition, there are presentations that do not provide images prior to the presentation, and display software applications such as diffusion sheets or drawing programs and presentations that include interoperability. For example, bucket planning and review sessions, design conferences, and distance learning have the advantage of interacting with one or more site software programs, and display software programs on all outputs of sites that participate almost simultaneously. have. As with Dunn et al., The Watson system has a problem that image data remains on the participant's computer. Accordingly, there is a need for a data conferencing system that can perform on-demand distributed transmission of presentations and display control of remote presentations without using an expensive centralized data storage server and without interaction among users at each remote conference site. Sex exists.

  Many conference facilities have a network connection point, such as a wall jack in the case of Ethernet®, but many facilities do not keep the computer connected to the network. Therefore, a great amount of time is required to connect the computers used at each conference site to the network. The time and complexity required to connect to this network is not configured for use at the conference site, but is configured for use on other networks or located elsewhere in the same network. This is further increased by using top-type computers and other mobile computers. None of the systems described above eliminates the complexity associated with connecting a computer to a computer network at each conference site prior to each conference session. Therefore, there is a need for a simple method of connecting a computer or other display device (display device) to data values for use in data conferencing.

  There is a need for a data conferencing device that includes a projector connection, a computer network connection, a voice network connection, and a data conferencing control mechanism in a single conventional tabletop unit.

SUMMARY OF THE INVENTION In the present invention, two or more remote conference sites have handsets and data conferencing equipment coupled to a voice call network such as a Public Switched Telephone Network (PSTN) or Private Branch Exchange (PBX). . Each site has a display device such as a computer display screen or an electronic projector, and displays an image composed of image data generated from an image source. To facilitate sharing of image data between sites, the network interface at each site couples the data conference control unit of the data conferencing device to a data network that links the sites independently of the voice call network.

  To initiate a data conference session between sites, a voice call session between handsets is first established over the voice call network. In the data conference control unit, an access negotiation process executed as software or hardware is manually initialized at the first site, a network device access code is identified, and then transmitted to at least the second site. The network device access code is generated by generating an audio signal representing the network device access code and is transmitted in a voice call session. In response to the reception of the audio signal of the second site, in the access negotiation process of the data conference control unit of the second site, the data between the sites is transmitted via the data network using the network interface module and the network device access code. Participate in a communication session. This eliminates the need for participants in the data conference to identify the network device access code or eliminates the need for personal interaction to establish a data communication session. Once a data communication session is established, images are transmitted between sites over the data network and displayed on the display device, and the audio portion of the conference is played as a voice call using the handset at each site.

  In a preferred embodiment, the data conferencing device, the handset and the network interface are integrated as a data conferencing speakerphone device, which is placed on the conference table at each site and by the data network, voice call network. Coupled to a display device, data conferencing according to the present invention is facilitated. An input key that can be manually activated is provided to initialize the access negotiation process.

  In other embodiments, the data conferencing control unit is implemented as software running on a computer workstation that also acts as a display device, handset and / or image source, or used with a separate handset, display device and image source. It can be implemented as hardware such as a simplified data conferencing device. The data conferencing device according to the present invention can include a network connector and automatic network routines for easily connecting an image source, such as a presenter's laptop computer, to a data network.

  Other concepts and advantages of the present invention will become apparent from the following description of the preferred embodiment with reference to the accompanying drawings.

DEFINITIONS Terms used in this application, including the summary of the invention, detailed description of preferred embodiments, and the language of the claims, have the meanings given below, unless explicitly indicated by the context in which they are used: .

  A “data network” is a network for transmitting encoded data as a digital signal, such as a local area network (LAN), a wide area network (WAN), and the Internet. The data network may include one or more modem transmission path segments that transmit data over the voice network in analog form, but exclude voice communication sessions. Data networks are distinguished from voice networks, which are designed to handle voice calls for the transmission of analog signals typified by voice and are not specifically designed to send digital data.

  “DHCP (dynamic host configuration protocol)” is a TCP / IP protocol that automates assignment and placement of IP addresses to hosts in a domain or corporate network. DHCP servers generally also include proxy servers or network address translation (NAT) servers, which are designed to allow hosts to access within the domain and not from outside the domain.

  “Display devices” are direct view displays such as computer monitors, raster displays, etc., and types of electronic projector devices sold by Infocus Corporation of Wilsonville, Oreg., The successor of this application. It is a device for displaying a character or an image including indirect display as described above, and is not limited to whether or not it can be directly connected to the installation location and the data network.

  “DTMF (dual-tone multi-frequency)” is a type of sound that is generated when a key on a telephone touchpad is pressed, commonly known as a “touch-tone” dial. Includes frequency combinations of 12 different sound pairs, and frequency combinations of other sound pairs that are not used on the phone touchpad.

  An “electronically generated audio signal” is a signal that represents an audible or nearly audible frequency tone or sound, including, for example, clicks, beeps, DTMF sounds, and modem sounds. Generated by an electronic circuit and can be transferred over a voice network without significant attenuation.

  An “image source” is a device that generates, generates or regenerates a data set or data stream representing one or more still images or video frames. For example, image sources include personal computers, laptop computers, DVD players and video playback devices such as VCRs (with either analog or digital video output), digital cameras ("webcams"). Still images or moving images), digitizing scanners, and personal digital assistants (PDAs).

  An “independent” voice network and data network, as defined herein, is one in which a parallel, exclusive voice call session and data network session are established. Voice network devices (generally circuit switching) are often physically distinguished from data network devices (typically packet switching), but need not be so distinguished. However, even if the data network session includes an analog or DSP modem transmission path segment transmitted over the POTS network, and the voice call is made by the data network device, eg, voice-over-IP (voice-over-IP). Data network sessions are always distinguished and separated from voice call sessions, even when transmitted using technology.

  A “key” or “input key” is an interface device such as a push button, switch or software button that can be activated by a mouse click or other computer input action. Otherwise, an input device for receiving one or more bits or data used to initiate the negotiation process of the present invention or to trigger other events in the system of the present invention It is.

  A “network device access code” or “network access code” is a type of address or code for accessing a device in a data network. For example, the network access code may be an IP address (static, dynamic, symbolic and virtual) according to a domain name, URL (uniform resource locator), IPv4 or IPv6 (including IPv4 of CIDR (classical interdomain routing)) Network addresses such as physical addresses (e.g. Ethernet addresses) can be included without limitation. And / or a passcode such as a session identification code, password, cookie, encryption code or key, and digital signature.

  “POTS” is an acronym for “plain old telephone system”, a widely used telephone interface and protocol standard that enables interoperability between voice telephone service provider networks worldwide. Although some packet-switched networks can interface a POTS network, the POTS network generally includes a circuit-switched telephone network and equipment for use therewith.

  The “Public Telephone Switch Network” (PSTN) is a collection of telephony resources that are widely available to the public, including resources that provide wireless and cellular services based on local and remote areas.

  A “handset” is any type of device that can be connected to a voice network for receiving analog or digital signals that are representative of voice telecommunications, including POTS handset sets, ISDN handsets, VoIP telephones, headsets. , Wireless telephone handsets, mobile or PCS telephones, computer workstations with emulation software, and other analog or packet telephone devices.

  A "voice call" or "voice call session" causes the caller to dial the telephone number assigned to the receiver of the call recipient and initiate the next call command (usually a telephone call) at the receiver's receiver. A voice call session begins after the call recipient answers at his or her handset. Voice calls are typically made by a POTS network, but can be made by other communication networks if the voice call session is logically separated from the digital data network session and not interconnected.

  A “voice network” is a network configured to handle voice calls, typically a POTS network, but includes a packet-switched network and the portion of the data network where VoIP calls are made. be able to.

  “VoIP” is a voice call in which the call path of at least one termination segment traverses the data network. VOIP digitizes an audio signal, transmits the digitized signal over a packet switched data network using IP, and the digitized signal into analog voice for listening at the receiving end of a voice call Including converting back.

  In this application, terms not specifically defined above are given in the commonly used context according to their generally understood meaning.

Detailed Description of the Preferred Embodiment FIG. 1 is a block diagram of a simple data conferencing system 100 operating at a local site 102 and a remote site 104, according to a first preferred embodiment of the present invention. Referring to FIG. 1, the local site 102 includes a local speakerphone 110 that includes a local conference device 112. A local display device 114 such as a projector and an image source 116 such as a laptop computer are connected to the local conference device 112 as well. The remote site 104 includes a remote speakerphone 120 that is connected to a remote data conferencing device 122, and the remote conferencing device 122 is connected to a remote display device 124. The local and remote data conference devices 112 and 122 include local and remote data conference control units 128 and 130, respectively, and the local and remote data conference control units 128 and 130 are local and remote of the data conference devices 112 and 122, respectively. Coupled to the data network 132 via network interfaces 134 and 136. The local and remote network interfaces 134, 136 are, for example, local and remote data conferencing in the form of diskless embedded computers loaded with software implementing the data conferencing method according to the invention, as will be described below with reference to FIG. It is preferable that the control units 128 and 130 are integrated. The local and remote data conferencing devices 112, 122 may be used to communicate audio signals on the input telephone line (RJ-11 jack), handset handset line (RJ-22 jack), or voice call. Also included are respective local and remote telephone adapters 140, 142 coupled to the voice network 146 via. The local and remote telephone adapters 140 and 142 are connected to the local and remote data conference control units 128 and 130, respectively, via, for example, a PCI bus or a parallel port (not shown), for example, RJ-11 jack and RJ-22 jack. Alternatively, they are connected to speakerphones 110 and 120 via other telephone voice lines (not shown).

  The elements and configuration of the local speakerphone device 110, local data conferencing device 112, and local display device 114 are identical in design and configuration to the corresponding remote speakerphone 120, remote data conferencing device 122, and remote display device 124. be able to. That is, the system 100 can be generic for local and remote sites 102, 104. However, the elements of system 100 need not be symmetric, i.e., need not be the same as far as they are concerned. For example, various means of distinguishing or integrating some or all elements in the data conferencing system 100 are within the scope of the present invention, as described below with reference to FIGS. Further, as will be described below with reference to FIG. 2, the data conference system according to the present invention is not limited to two sites, and by using the system, a data conference session can be performed at more than two sites. Can be established.

  FIG. 2 is a flowchart showing a data conference method 200 executed by the data conference system 100 of FIG. Referring to FIGS. 1 and 2, a voice call 148 (shown as a voice path through the voice network 146 of FIG. 1) is established between the local and remote speakerphones 110, 120 (step 210). . Voice call 148 is by using conventional telephone dialing (eg, 7-digital, 10-digital or 11 digital dialing in North America, and 3-digital, 4-digital or 5-digital dialing in PBX networks). Or can be established by other methods, for example using the VoIP calling method. Each telephone adapter 140, 142 may include a voice bridge (not shown) that couples the speakerphones 110, 120 to the voice network 146, respectively, with the telephone adapters 140, 142 being passively telephoned. The line can be monitored to determine, for example, whether the speakerphones 110, 120 are off-hook and whether a voice call 148 is established.

  In order to establish a data communication session between the local and remote sites 102, 104 via the data network 132, the user at one or both of the sites 102, 104 can perform a data conference at any time during the voice call session. The system 100 is manually activated using an input key (not shown) provided on the initialization device of the devices 112,122. The input key is preferably a push button that can be manually activated by the user. By manually activating the input key, the data conferencing apparatus switches to an initialization state, thereby starting an access negotiation process (hereinafter referred to as “negotiation process”). The input key can end the data communication session by the second operation. The following example negotiation process includes an initial negotiation process at the local site 102. That is, it is understood that the negotiation processes are mutually initialized from the remote sites 104. In order to allow negotiation processing via the voice network 146, the local and remote telephone adapters 140, 142 generate audio signals (not shown) and send audio signals over the voice call 148 in response to commands. Circuit to perform. These are shown in the negotiation process (step 220). Telephone adapters 140 and 142 also include circuitry for recognizing such audio signals when received via voice call 148. At least some of the audio signals transmitted by the negotiation process encode a network device access code.

  The network device access code (hereinafter “network access code” or “access code”) may be in the form of a computer network address, data network address or code for the local data conferencing device 112 or the data conferencing session itself. For example, domain name, URL, IP address according to the rules of IPv4 or IPv6 (including IPv4 by CIDR), virtual address (for example, multicast group address) physical address (for example, Ethernet (registered trademark) address or other MAC address), Session ID or passcode. The format of the address is predefined and can be used in common for the negotiation process of the data conference control units 128, 130, and can include, for example, a 32-bit IPv4 address expressed as a series of 12 decimal digits. The audio signal used for network access code transfer (and other data transferred during the access process) can include blank-and-burst techniques, DTMF tones, notch modem signals, and voice calls. It can include other types of electrically generated audio signals that can transfer data over an active voice call session with little or no interruption and without terminating the voice call session.

  After receiving the audio signal at remote data conferencing device 122 and recognizing the network access code, data conferencing system 100 resumes the audio conferencing portion of the data conference via audio call 148 (step 230). Concurrently with the resumption of the audio conference, the local and remote data conferencing devices 112, 122 preferably conduct the data network session 160 via the data network 132 by the network interface modules 134, 136, respectively, using known internet protocols. Establish (step 240). Once the data network session 160 is established, the data conferencing system 100 communicates between the local and remote sites 102, 104 via the data network session 160 while the audio component of the data conference is transmitted by voice call 148 (step 230). Image data can be transmitted (step 250).

  One suitable protocol for establishing the data network session 160 includes the use of multicast group addressing (multicasting). In multicasting, the network access code includes a single multicast group address selected from a range of available multicast group addresses reserved according to the IPv4 or IPv6 standard. Devices in the data network can join the multicast group and receive transmission data sent to the selected multicast group address. Multicasting is a group transmission model that restricts data transmission to only the part of the data network where group members are provided. Multicasting is used for communication between two or more sites and has the advantage of avoiding problems related to addressing data conferencing equipment that is hidden behind a domain proxy or in a corporate network using DHCP . Multicasting reduces network traffic when transmitting data to multiple data conference participants and facilitates image transmission from the data conference site to all other participating sites.

  The selection of the multicast group address can include the use of a dynamic client allocation protocol service (“MADCAP”) of the multicast address accessible via the data network. On the other hand, the multicast group address can be selected randomly by the initialization data conferencing device, eg, by making it the same as the pending multicast group address using trial and error techniques. The multicast group address can be selected by other procedures. Since all data conferencing devices that join the multicast group can operate with the same network address (ie, multicast address), the address negotiation process is a single transmission with the multicast address commonly used from the initialization data conferencing device. It is necessary to distribute network addresses to participating sites via voice call 148. Upon receiving the multicast group address, all participating sites join the multicast group and establish a data connection between them via the data network.

  The access negotiation process of the local and remote data conferencing devices 112, 122 can include a security protocol that includes encryption code conversion over either or both of the data network 132 and the voice network 146, and the local and remote data conferencing devices Data communication encrypted between 112 and 122 can be performed.

  In order to improve the response and efficiency of the system 100, the local and remote network interfaces 112, 122 preferably include local and remote image processing subsystems 164, 166, respectively, and image prior to transmission via the data network session 160. Data is compressed, and image data is decompressed (decompressed) when received. On the other hand, image compression may be performed locally and remotely before distributing substantially the same uncompressed image to the respective local and remote display devices 114 and 124 connected to the local and remote image processing systems 164 and 166. It can be implemented in software or hardware in the image source 116 along with a decompression process that is performed only in the image processing systems 164, 166. The image processing subsystems 164, 166 can also perform image scaling and recalculate the image to a predetermined size before distributing the image to match the pixel resolution of the local and remote display devices 114, 124, respectively. Let

  The local image processing subsystem 164 includes a frame buffer (not shown) and can receive frames of image data 188 from the image source device 116 and sense changes in the image represented by the image data 188. As changes are sensed by the local image processing subsystem 164, frames of the current image data 188 are processed and displayed on the local display device 114 (step 270), individually compressed and transmitted over the data network session 160. . However, frame buffering and change detection is performed in the software of the image source device 116 to reduce the amount of data 188 transmitted between the image source 116 and the local conference device 112.

  In addition to handling the transmission of image data in the data network session 160, the local and remote conferencing devices 112, 122 are coupled to local and remote display devices 114, 124, respectively, to control the displayed images and to indicate error conditions. Exchange control data (not shown) for reporting and communicating other information useful to facilitate data conferencing.

  By eliminating the need to distribute image data to all sites participating in a data conference or to a central server prior to a data session, the present invention distributes images and displays “in operation”. It can be done almost simultaneously with their generation or playback in the source. The distribution and display of images in operation also reduces the storage of image data required at each participating data conference site. The data conference system according to the present invention can be configured such that no image data remains at the participating sites after the data conference session ends.

  As easily understood by those skilled in the art, the functions of the speakerphone, data conference control unit, telephone adapter, network interface, image processing subsystem and display device are divided and configured at each presentation site in various ways. Can do. Further, the configuration and division of data conferencing components can result in various connection layouts at each data conferencing site and for the voice and data networks accessible to that site. FIG. 3-12 is a network diagram illustrating the configuration of some preferred and other data conferencing systems. It should be emphasized that the configuration shown in FIGS. 3-12 is merely illustrative of the system and network configuration within the scope of the present invention and is not limited thereto.

  Referring to FIG. 3, the data conferencing system 300 according to the first preferred embodiment 100 shown in FIG. 1 includes a local projector 308 (or other display device), a local speakerphone 312 and an image source 316 at the local site 302. These are all connected to a simple local data conferencing device 322. Local data conferencing device 322 includes a telephone adapter (not shown) for connecting to voice network 330 and a network interface (not shown) for connecting to data network 340 that is independent of voice network 330.

  At remote site 352, remote projector 358 (or other display device) and remote speakerphone 362 are connected to remote data conferencing device 368. Remote data conferencing device 368 includes a telephone adapter and a network interface (not shown) for connecting remote data conferencing device 368 to voice and data networks 330 and 340, respectively.

  Local and remote data conferencing devices 322, 368 include push buttons 374, 376 or other key means for initiating a negotiation process implemented in software or hardware of devices 322, 368, respectively. The local and remote data conferencing devices 322, 368 can be similar in all respects. However, as shown in the embodiment 300, the remote data conferencing device 368 need not include an interface for connecting image sources at the remote site 352. During operation, a data conference session is established using the data conference system 300 by the method shown in FIG. In particular, a voice call is initially established between the local and remote speakerphones 312, 362. One of the local and remote data conferencing apparatuses 322 and 368 operates by pressing one of the push buttons, and starts negotiation processing of the respective local and remote data conferencing apparatuses 322 and 368. A network address is generated by the negotiation process and encoded as an electronically generated audio signal that is transmitted exclusively between the local and remote data conferencing devices 322 and 368 via the voice network 330. After the address transmission is complete, the local and remote data conferencing devices 322, 368 establish a data network session between these devices over the data network 340 using the network address.

  FIG. 4 is a network diagram illustrating a data conferencing system 400 of the second preferred embodiment. Referring to FIG. 4, local and remote projectors 402 and 406 at respective local and remote sites 410 and 420 have local and remote network interface modules 418 and 420 for connecting the projectors 402 and 406 directly to the data network 428. Includes each. The local and remote data conferencing devices 436 and 438 include push buttons 446 and 448, respectively, any one of which is manually pressed to initiate the negotiation process via the voice network 444, according to the present invention. Establish a data network session.

  The local and remote speakerphones 456 and 458 are connected to the remote data conference devices 436 and 438, respectively, similarly to the data conference device 300 (FIG. 3) of the first embodiment. Similarly, image source 466 is connected to local data conferencing device 436. However, contrary to the configuration shown in FIG. 3, local and remote network interfaces 418 and 420 are integrated into local and remote projectors 402 and 406, respectively, for directly connecting projectors 402 and 406 to data network 428, Or installed. Furthermore, in their direct network connection, it is desirable that the projectors 402, 406 have an integrated image processing subsystem. In this way, all image transmission and display functions are handled by projectors 402 and 406 so that local and remote data conferencing devices 436 and 438 can handle initial data conference negotiation processing and other interactions with voice network 444. It is only necessary to realize a control unit function including

  FIG. 5 is a network diagram illustrating a data conferencing system 500 of the third preferred embodiment. Referring to FIG. 5, data conferencing system 500 includes local and remote projectors 508 and 558, local and remote speakerphones 512 and 562, and local and remote data conferencing devices 522 and 568 at local and remote sites 502 and 552, respectively. All of these include those of the first preferred embodiment, except that the image source 580 is connected directly to the local display device 508 rather than to the local data conferencing device as in the system 300 of FIG. It is configured almost the same as the data conference system 300 (FIG. 3) and is connected to the voice and data networks 530 and 540. The configuration of the system 500 of this third preferred embodiment is that the image generated by the image source 580 is displayed by the local display device 508 without being preferentially image processed by the image processing subsystem of the local data conferencing device 522. In that it differs from the configuration of the system 300 of the first preferred embodiment. In other words, raw image data from the image source 580 is used by the local display device 508, which may have its own integrated image processing subsystem. The local data conferencing device 522 receives the image data from the local display device 508 and compresses the image data before performing transmission for reception by the remote data conferencing device 568 via the data network 540. The remote conferencing device 568 decompresses the received image data before delivering the image data to the remote display device 558 for display, similar to the decompression step described above with respect to the data conferencing system 300 of the first preferred embodiment. Image processing subsystem.

  FIG. 6 is a network diagram illustrating a data conferencing system 600 of the fourth preferred embodiment, which does not directly access the data network, eg, via an Ethernet connection or other digital data network access point. Used at local site 602. Referring to FIG. 6, the network interface of local data conferencing device 620 includes a telephone modem 624. The modem 624 is configured to indirectly access the data network via an Internet service provider (“ISP”) 630, and the modem 624 establishes a modem communication session with the ISP 630 via the voice network 640. For convenience, when the push button 644 of the local data conferencing device 620 is pressed, the modem 624 can be configured to automatically dial, log on to the ISP 630 and access the data network 610. The modem 624 is connected to, for example, V.I. A conventional voice call modem utilizing the 90 protocol, where two telephone lines are required, the first telephone line 660 is for modem 624 and the second telephone line 662 is local For voice call sessions between speakerphone 648 and remote speakerphone 678.

  As an alternative, the modem 624 can be a DSP modem (not shown), in which case the same telephone line used by the local speakerphone 648 can be used at the local site 602. . In an alternative DSP, the DSP modem transmits data in a frequency band different from the frequency band used by the telephone, so the voice call session and the data network session share a single telephone copper line at the local site 602. be able to. At a telephone carrier central office (not shown) of the voice network 640, voice calls and DSP data sessions are generally separated and retransmitted via different physical media, so the voice call session is remote over the voice path. A route to the speakerphone 678 is set, and a DSP data session is routed to the remote data conferencing device 568 via the ISP 630 via a data path (not shown). Thus, while voice calls and data network sessions share the same physical transmission media for their routes between local and remote sites 602, 604, the voice and data networks 640, 610 remain independent. .

  The data conferencing system 600 of the fourth preferred embodiment illustrates the distinction between the types of voice and data networks used in the present invention. These networks can share physical devices, but voice calls and data network sessions are separated and not interconnected. Therefore, the voice call signal does not affect the data network session or the associated data network service, and conversely, the signal transmitted in the data network session does not affect the voice call or the associated voice network service. As will be readily appreciated by those skilled in the art, the concentration occurring in recent data network and voice telecommunications technologies has obscured historically distinct features, protocols, and equipment used in voice and data networks. It has become. Nevertheless, although physical network devices and communication media are used for such purposes, those skilled in the art appreciate that the method of establishing a voice call differs from the method used to establish a data network session. To do. Handsets, such as conference room speakerphones, are typically assigned a telephone number that is indexed into the telephone directory or accessible through a telephone operator. Conversely, data network addresses (eg, IP addresses) are dynamically allocated and are generally not indexed in a meaningful manner for normal data conference participants.

  By not requiring the participant to know the network access code of the device installed at either the local or remote site, the present invention considerably facilitates the steps performed by the data conference participant. The data conference control unit according to the present invention is configured to automatically obtain a network access code, and also automatically transmits a voice call signal using an access negotiation process, at one or more geographical remote sites. It is configured to send an appropriate access code to further data conference control units.

  The negotiation process of some embodiments of the present invention includes exchanging the network addresses of the respective network interface modules. However, other embodiments include transmission of a multicast group address or network address or passcode, for example, in a centralized conference service provided on the World Wide Web. Despite such access codes being exchanged, the present invention eliminates the need for conference participants to enter network address information into the data conference system when establishing a data conference session. Further, in some embodiments, only one participant performs an action to operate the system, i.e., by pressing a key on the participant's data conferencing device or other component of the system. It is necessary to take action to make it work. On the other hand, other embodiments require all users to press a key or otherwise activate the key before adding the data portion of the data conference, which provides system security. can do.

  FIG. 7 is a network diagram showing a fifth preferred embodiment of the data conference system 700. In this example, the local data conference device 710 communicates with the image source 720 and the display device 730 installed at the local site 732. A wireless network device (not shown). At the remote site 740, the remote display device 744, the remote data conferencing device 748, and the remote speakerphone 752 are connected to the voice network 760 voice data in a manner similar to the corresponding system components of the second preferred embodiment system 400 (FIG. 4). Connect to network 762. Various wireless network technologies can be used as the wireless networking device of the local data conference device 710 and the image source 720 audio local display device 730. For example, a device that operates based on the IEEE 802.11 standard can be used. Other wireless network technologies used with the present invention include home RF systems, infrared networking systems, and other short and long range wireless networking systems and devices including short range peer to peer wireless networking such as BLUTOOTH. On the other hand, those skilled in the art will appreciate that the data rate supported by various wireless networking technologies affects the performance of the system and many additional steps of image data compression and decompression in wireless transmission between components of the system 700. Assume to give.

  FIG. 8 is a network diagram of the data conferencing system of FIG. 7, in which the local data conferencing device 810 includes a wireless LAN hardware 804 for communicating with a wireless networking access point 820 coupled to the data network 830. Including. Those skilled in the art will appreciate that various other variations on wired and wireless network connections can be used in the present invention. The specific combinations of wired and wireless networks shown in FIGS. 7 and 8 are shown by way of example and are limited to the scope of wireless or wired networks used with data conferencing and data system components utilizing the present invention. It should not be interpreted as a thing. In general, the network connections shown by the solid lines connecting the components of the data conferencing system of FIGS. 3-12 can be replaced by wireless links that carry data signals or audio signals.

  The present invention facilitates the use of one or more image sources that generate visible display images in a data conference. FIG. 9 shows a network diagram of a data conferencing system that uses a local computer workstation 902 and a remote computer workstation 904 as image sources located at a local site 910 and a remote site 912. Local and remote computer workstations 902 and 904 execute multi-image display management software that facilitates the display of visible images. For example, local and remote source image content can be displayed side by side on the split screen displays 920 and 922. Alternatively, it can be displayed as a picture-in-picture alternately, rotated or tilted in the direction of the user or according to other criteria. Local and remote displays Storage 930 and 932 senses when one or more image data is connected (including when indirectly connected via data network 940) and stores multiple image displays. Constitute.

  Variations of the present invention (not shown) can display one or more image sources connected to a data network, display images from multiple image sources connected directly to a single data device, and This includes the use of numerous data devices.

  FIG. 10 is a network diagram illustrating another embodiment of a data system 1000 according to the present invention. Referring to FIG. 10, the data system 1000 includes integrated local and remote speakerphone devices 1010 and 1012 at a local site 1002 and a remote site 1004, respectively, see FIGS. 13 and 14 for these. Will be described later. The integrated data speakerphone devices 1010 and 1012 perform the functions of both the simplified data device and speakerphone described with reference to FIGS. In addition, the integrated data speakerphone devices 1010 and 1012 are intended to be arranged on a working surface such as a conference table, and access to the data network 1020 and the voice network 1030 is performed on a normal table. Can do. Optionally, local and remote integrated data speakerphones 1010 and 1012 function as wireless networking access points or hubs when installed as wireless networking hardware.

  FIG. 11 is a network diagram illustrating another preferred embodiment of the data system 1100, which is an integrated data in which a speakerphone 1116, a telephone keypad 1118, and a projection display device 1120 are integrated. Includes projector equipment. This integrated data projector apparatus 1111 is connected to an integrated network interface module (not shown), a push button 1122 for starting a data control unit (not shown), an audio network 1130 and a data network 1140. Connector (not shown). Beneficially, integrating the projection display device 1120 of the data projector apparatus 1111 improves the portability of the data system and simplifies setup at the conference site. On the other hand, many users may prefer to separate the projection display device from the other components of the system (the components of the data system of FIGS. 3-10), so that the projection display device can For example, display devices can be placed on the ceiling plate of the conference room, and speakerphones and data control users can be placed on the conference table to facilitate access by interested parties. it can.

  The embodiment of the data system described with reference to FIGS. 3 to 11 uses the system only at two conference sites. The data system, apparatus and method according to the present invention are preferably installed symmetrically or peer-to-peer and can be used to link two or more remote data sites. FIG. 12 is a network diagram showing a data system for linking five sites in five-way data according to the present invention. The number of sites that can be included by the present invention is limited only by the speed and performance of the system and the components of the network. Theoretically, data conference sessions between a very large number of related data sites can be established, and data conference sessions can be established between hundreds or thousands of sites. One skilled in the art can envision that a conference contact device is required to support the audio conferencing portion of a data conference between multiple parties due to less sophisticated conference call devices and techniques.

  Referring to FIG. 12, the data conferencing system links the first, second, third, fourth and fifth data conferencing sites via separate voice networks 1210 and data networks 1212. As described in FIG. 6, for the sake of simplicity, the data network connection between the data conference sites 1201 to 1205 and the data network 1212 are not shown. However, connections not shown, for example, modem connections that make up a segment of the data network 1212 are within the scope of the present invention. Similarly, the connection of the data conference system 1200 is not shown as a wireless connection. On the other hand, wireless network connections can be readily utilized at sites 1201-1205 or as an alternative to data network connection 1220 of data conferencing system 1200.

  At the first data conference site 1201, a normal speakerphone 1242 and projector 1244 connect to a first simplified data conference device 1246 of the type described in FIGS. The hardware and / or software of the data conferencing device 1246 includes a network interface module, a data conferencing control unit, and an image processing subsystem. The data conferencing device 1246 is individually connected to the voice network 1210 and the data network 1212.

  At the second data conference site 1202, the projector activated by the network includes a network interface module 1254 that communicates with the data network 1212. Projector 1252 connects to a data conferencing speakerphone device 1256 having an integrated data conferencing control unit and speakerphone, which connect to an audio network 1210.

  The third data conference site 1203 includes only the speakerphone 1258, which connects to the voice network 1210 to communicate with parties in the audio portion that is not the visible device of the data conference.

  At the fourth data conferencing site 1204, the computer workstation 1262 includes display device 1264 and an image processing subsystem and optional display software that acts as an image source and coordinates multiple image displays. A network interface module (not shown) of computer workstation 1262 connects computer workstation 1262 to data network 1212. The computer workstation 1262 is also connected to a simplified data conferencing device 1268 that includes a data conferencing control unit and a telephone adapter (not shown) according to the present invention. The data conferencing device 1268 is connected to the voice network 1210, and the first, second, third and fifth sites 1201, 1202, 1203 and 1205 and network access codes via voice signaling transmitted over the voice network. Replace. The telephone set 1270 is connected to the data conferencing device 1268, and the person at the fourth site can be contacted by the audio device.

  At the fifth data conference site 1205, the computer workstation 1280 includes a video display monitor 1282, a microphone 1284, and a line speaker 1286. The computer workstation 1280 includes a network interface module (not shown) that communicates with the data network 1212 and a sound card, and a telephone adapter or other hardware (not shown) for connecting to the voice network 1210. The software that performs the processing of the computer workstation 1280 handles incoming and outgoing telephone calls and performs all functions of the telephone handset, data conferencing device, image source, and image processing subsystem within the scope of the present invention. . In this regard, the computer workstation 1280 is integrated in FIG. 11 except that the display device of the workstation is a display monitor 1282, whereas the display device of the integrated data conference device 1111 is a projector. The data conferencing apparatus 1111 is similar to the data conferencing apparatus 1111.

  Voice call sessions are established between the first, second, fourth and fifth sites 1201, 1202, 1204 and 1205 and based on the data conferencing method described above, the first, second, fourth and second. Conversation takes place by assigning a network access code to 5 sites. For the third site, only one-way audio is connected to the data conference session, so a common conversation cannot be conducted.

  FIG. 13 is a perspective view showing the integrated data conference speakerphone device 1010 of FIG. Referring to FIG. 13, the data conferencing speakerphone device 1010 includes a housing 1302 that holds a speakerphone including a loudspeaker 1304 and a touchpad 1306 for dialing the speakerphone. A voice call is established over the voice network by dialing the telephone number of the remote site using the touchpad 1306. The speakerphone ON / OFF button 1314 controls the on-hook or off-hook state of the speakerphone when initializing or terminating the voice call session. Data conferencing speakerphone device 1010 also includes an integrated interface module, data conferencing control unit, and a telephone adapter (not shown) connected to the voice network via telephone line 1310. In accordance with the method of the present invention described with reference to FIG. 2, the data conferencing control unit is a digital processor and other circuitry configured to control a telephone adapter that transmits an electronically generated voice signal during a voice call. Or software. The data conference speakerphone device 1010 connects a video image source 1420 (FIG. 14) such as a personal computer to an input device such as a data network and a wireless keyboard via an infrastructure wireless network access point (not shown). And a peripheral device such as a keyboard, a digitizing table, an image source device, and optionally a wireless LAN card 1328 and a wireless input device receiver (not shown) connected to the data network. One or more USB slots 1322 to be included. A DVI or USB cable 1334 connects the data conference speakerphone device 1010 to a projector or display device (not shown). Network cable 1338 connects the network interface module of data conference speakerphone device 1010 to an external data network. One or more RJ-45 connectors 1342 are useful for connecting an image source device or other network enable device to a data network. A power cable 1346 is connected to a 110 VAC power source or wall socket to supply power to the data conference speakerphone device 1010. Finally, a push button for activating the data conference control unit is provided to execute the access processing and voice call signaling method according to the present invention.

  An additional advantage afforded by the data conferencing speakerphone device 1010 is the ability to allow normal table tap connections to display devices and voice and data networks by integrating various connector audio cables into a single unit. It is. Thus, the data conferencing speakerphone device 1010 is useful as a normal means of connecting a provider's computer (or other image source) to a display device and / or data network even if the data conferencing feature is not utilized. is there.

  FIG. 14 is a perspective view showing details of the data conference speakerphone device 1010 of FIG. Referring to FIG. 14, an RJ-45 connector and a PC-video IN connector 1318 are connected to cables 1410, 1412, which are housed in a housing when not in use, and are connected to a computer 1420 or other network enable device or It can be pulled out when necessary to connect to the image source device.

  FIG. 15 is a state diagram showing the steps of an embodiment of address exchange processing 1500 (conversation operation) of a data conference device that operates according to the present invention. Referring to FIG. 15, the data conferencing apparatus performs ringing (2) when a ringing signal 1504 is received via the voice network, and thereby the attached handset is ringed. Once the voice call session is established (3), the data conferencing device push button or other input key is manually activated 1510 to send a “0” DTMF tone and to listen 1516 for the reply. Alternatively, the data conferencing device hears a “0” DTMF tone. When a “0” DTMF tone is transmitted from the local data conference device, the remote data conference device reduces the volume of the attached handset and responds with a DTMF tone representing the IPv4 decimal address. Upon receipt of this 12DTMF tone, the local data conferencing device ends the switching operation by replying to the remote data conferencing device using the 12 digit IPv4 decimal address of the local data conferencing device represented by the 12DTMF tone 1534. Once the network address has been exchanged, the data conferencing device LED is lit to indicate 1540 that a data network session has been established.

  After the data network session is established, the data network session can be terminated by activating the input key. Once the teardown is complete, the LED turns off 1560 and the data conferencing device is reset 1580 to the ready state. As will be appreciated by those skilled in the art, the conversation operation 1500 includes the transmission of only one address in addition to both IP addresses, for example when utilizing multicast addressing, as described with reference to FIG. Further, instead of using the DTMF tone described with reference to FIG. 15, other types of electronically generated audio signals (not shown) can be used by another address exchange method. The call operation 1500 can also include error checking and error correction.

  FIG. 16 is a diagram showing another embodiment of a data conference system 1600 in which the present invention is applied to a computer network firewall. Referring to FIG. 16, the data conferencing system 1600 is configured to communicate between a local site 1602 and a remote site 1604. The local site 1602 includes a firewall 1610 installed on the local site side between the local data conferencing device 1616 and the data network 1620, which is located outside the local site 1602. The firewall 1610 acts as a gateway and prevents unauthorized network traffic from entering the local site 1602 LAN using methods known in the art. The remote data conferencing device 1626 is located at the remote site 1604 and can be configured similarly to the local data conferencing device 1616 or can be configured differently. Although not shown in this modification, the present invention works well even if the remote site 1604 is hiding firewalls. This embodiment can be used to establish a data conference session between two or more sites.

  An Internet conference server (ICS) 1630 is coupled to the data network 1620 for communication via the firewall 1610, and the server can be accessed from the remote and local data conferencing devices 1616, 1626 via the data network 1620. To. The server ICS 1630 acts as a storage device for commands and data that are corrected between the local site 1602 and the remote site 1604 via the data network 1620. When data, images or commands are waiting to be retrieved by another data conferencing device, the data conferencing devices 1616, 1626 may receive data and / or commands sent via the ICS 1630 to ensure reception. An electronically generated audio signal (not shown) can be transferred over the voice network 1640. Alternatively, the data conferencing devices 1616, 1626 can periodically access the ICS 1630 to determine whether new data or commands are waiting on the ICS 1630. By having the receiving site search for information temporarily stored in the ICS 1630, the data conferencing device 1600 of FIG. 16 needs to use multicast addressing by sending data or commands via the firewall 1610. The problem can be solved without.

  At the time of activation, the network address of the server ICS 1630 is stored in the memory of the local data conference device 1616. (In practice, the network address of the ICS 1630 is preferably stored on all data conferencing devices at the time of manufacture.) To initiate a data conferencing session, the user at the local site 1602 has a local speakerphone 1652 and a remote speakerphone 1654. Establish a voice call between them and manually activate the local data conferencing device 1616 to send a request to the ICS 1630 via the data network 1620. In response to a request from the local data conferencing device 1616, the ICS 1630 sends a data conferencing session process, allocates memory, assigns a data conferencing session ID, and encrypts this session ID (or passcode) and security communication. Reply to the data conferencing device 1616 using the encryption key. Since the data conference device 1616 requests a response from the ICS 1630, the response can reach the local data conference device 1616 by the firewall 1610. Upon receiving a response from ICS 1630, local data conferencing device 1616 transfers an audio signal representing the session ID (or passcode) as a voice call received by remote data conferencing device 1626 via voice network 1640. When using a passcode, the remote data conferencing device 1626 establishes secure communication with the ICS 1630, which exchanges data and / or commands between the local data conferencing device 1616 and the remote data conferencing device 1626. Acts as a mailbox. Except for the functions associated with ICS, the data conferencing system 1600 operates using the method 200 described with reference to FIG. 2 in the same manner as the data conferencing system 100 of FIG.

  It will be apparent to those skilled in the art that many modifications can be made to the details of the above-described embodiments of the invention without departing from the principles of the invention. Accordingly, the scope of the invention should be determined solely by the appended claims.

FIG. 1 is a block diagram of a simple data conferencing system including local and remote data conferencing devices according to a first preferred embodiment of the present invention. FIG. 2 is a flowchart representing a data conferencing method performed by the system of FIG. FIG. 3 is a network diagram illustrating the data conferencing system of FIG. 1 operating between a local data conference site and a remote data conference site. FIG. 4 is a network diagram illustrating a second preferred embodiment data conferencing system that includes a projector operable on a network, the projector having an integrated network interface for communicating over a data network. FIG. 5 is a network diagram illustrating a third preferred embodiment data conferencing system including a laptop computer that delivers as an image source connected directly to one of the display devices. FIG. 6 illustrates a fourth preferred embodiment data conferencing system in which one network interface of the data conferencing device includes a modem for accessing the data network via a dial-up connection to an Internet service provider (“ISP”). FIG. FIG. 7 illustrates a fifth preferred embodiment data conferencing system in which the local data conferencing device includes a wirelessly operable local projector and a wireless network device for communicating with the wirelessly operable local image source device. It is a network diagram. FIG. 8 is a network diagram of the data conferencing system of FIG. 7 in which the local data conferencing device further includes wireless network hardware for communicating with an infrastructure wireless network access point. FIG. 9 illustrates data of a sixth preferred embodiment that uses two image source devices to generate image content in parallel and share the image content between sites for display device display in a split screen format. It is a network diagram which shows a conference system. FIG. 10 is a network diagram illustrating a data conferencing system of a seventh preferred embodiment including an integrated data conference speakerphone device. FIG. 11 is a network diagram illustrating the data conferencing system of the eighth preferred embodiment including a combined data conference speakerphone device and projector. FIG. 12 is a network diagram showing five conference sites participating in a data conference according to the present invention. These sites include one site without a display device and a data conference control unit realized by software of a computer workstation. Including other sites that have. 13 is an enlarged drawing of the integrated data conference speakerphone device of FIG. FIG. 14 is a drawing of the data conference speakerphone device of FIG. 13 showing a retractable network cable and peripheral cables extended from the device for connection to a laptop computer. FIG. 15 is a state diagram illustrating the steps of the IP address exchange procedure of the data conference control unit operating according to the embodiment of the present invention. FIG. 16 is a block diagram of another example data conferencing system that includes an Internet conference server using the present invention with a computer network firewall.

Claims (34)

A method of data conferencing between two or more sites, each site including a display device and having access to a shared voice call network and a shared data network comprising:
At each site, a handset and a data conference control unit coupled to the voice call network are provided, and a network interface coupled to the data network is provided, and the data conference control unit at each site is connected to the display device and is coupled to the network interface,
The image source for generating image data representing an image is provided, coupled to the image source to one of said network interface,
To perform a voice call between sites, establishing a voice call session via the voice call network between the handset of the site,
In the data conference control units of the first site, to obtain the IP address, transmitting the IP address in the voice call session,
In the data conference control unit at least a second site receives the IP address that has been transmitted from the first site,
In response to receiving the IP addresses in the second site via the data network using the IP address to establish a data communication session between said sites,
Via the data network, and transmits the image data between said sites,
In the site, data conferencing method of displaying an image by the display device. The data conference method according to claim 1, wherein the voice call is interrupted by transmission of an IP address during the voice call session.
Wherein after transmitting the IP address during a voice call session, without the voice call session is terminated, data conferencing method restarts the voice call between the sites. The transmission of the IP address in the voice call session, generates an audio signal representing the IP address electronically, data conferencing method according to claim 1, comprising transmitting the audio signals the occurred.   The data conferencing method of claim 3, wherein the electronically generated audio signal includes a series of DTMF tones. At least one data conference control unit includes an input key;
The step of obtaining the IP address and the step of transmitting the IP address during a voice call session via the voice call network are executed as a negotiation process started by manually activating the input key. The data conferencing method according to 1. In the negotiation process, through the process and the data network receives the IP address running establishing a data communication between the sites,
Each of the two or more data conference control units includes an input key;
6. The data conference method according to claim 5, wherein an input key of each data conference control unit is manually activated to end the negotiation process.   The data conference method according to claim 5, wherein the input key includes a push button. The IP address is a first IP address, and the network interface of the second site includes a second IP address,
In response to receiving the first IP address in the second site, data conferencing method according to claim 1 for transmitting the second IP address in the voice call session to the first site . The IP address includes a multicast group address that identifies a multicast session;
The establishment of the data communication session between the sites, wherein each site, data conferencing method according to claim 1, comprising join the multicast session using the multicast group address. The IP address is, via said data network to an address of accessible Internet Conference Server (ICS), data conferencing method according to claim 1. An internet conference server (ICS) accessible through the data network;
Wherein the data conference control unit of the first site to obtain a passcode from the ICS via the data network, and transmits the passcode obtained to the second site in the voice call session, the path code is associated with one or more conference sessions ICS that is configured to re-transmit while receiving image data through the data network,
Establishment of a data communication session between the site via the data network, at each site, comprising said transmitting a passcode to the ICS via the data network, accessing at least one conference session in ICS The data conferencing method according to claim 1. The data conference method according to claim 1, further comprising: exchanging an encryption code between the data conference control units to secure a data communication session. One of the handset is voice - can receive or transmit a voice call using the over -IP (VoIP) protocol,
The data conferencing method of claim 1, wherein establishing a voice call session between the handsets includes establishing a voice-over-IP call segment. Wherein the provision of the image source includes providing a plurality of image sources for generating a plurality of sets of image data representing a plurality of images, these images source is coupled to one or more network interfaces,
Transmission of image data between sites through the data network includes transmitting a plurality of sets of image data,
The data conference method according to claim 1, wherein displaying an image by a display device at each site includes displaying a plurality of images at each site. Before transmitting the image between the sites, the site of the sender, to generate image data compressed by compressing the image data, the image data set transmitted image data is the compressed over a data network Including transmitting ,
In the data conference control units of each site other than the site of the transmitting side, receiving said compressed image data, data conferencing method according to claim 1 for decompressing the image data set which has been compressed Datte earlier image display . The data conferencing method according to claim 1, wherein the display device at each site has pixel resolution,
In each site, prior to the image display by performing the scaling and sizing of the image data, data conferencing method of adjusting an image to match the pixels resolution of the display device. Of one or more sites, the data conference control unit, said network interface, and data conferencing method according to claim 1, wherein the display device is integrated as a computer workstation. Data conferencing method according to claim 17 wherein the computer workstation having the image source.   A system that operates based on the data conferencing method of claim 1. A data conferencing device used in the local site to perform data conferencing session between a local site and at least one geographically separated remote site, the local site and the remote site shared voice call network and is accessible through a shared data network, wherein the remote site has a remote data conferencing device connected to the voice call network and the data network, at least one of said local site and said remote site image having an image source for generating image data representing, the data conferencing device,
The handset connects to the voice call network, a telephone adapter for establishing voice call session between the handset and the remote site via the voice call network, with monitoring the voice call session a telephone adapter includes circuitry for transmitting signals in the voice call session,
A network interface for connecting the data conferencing device to the data network,
A projection device for displaying an image at the local site;
Which is connected to the phone adapter and the network interface, a data conference control unit is configured to communicate with the projection device, to obtain network access code, to the telephone adapter, by said remote data conferencing device A data conferencing control unit for performing a negotiation process for generating a signal representative of a received network access code and transmitting it during said voice call session ;
A housing configured to incorporate the telephone adapter, the network interface, the projection device, and the data conference control unit to form an integrated data conference device ;
Said data conference control unit, the Ru is transmitted from said remote data conferencing device during a voice call session, in response to receiving the remote signal representative of the remote network access code in the telephone adapter, the remote network access code by establishing parallel data communication session with the voice call session between the local site and the remote site via the data network using the image data, the display of the projection device and the remote site to view through the device, and to be transmitted between the local site and the remote site via the data network, data conferencing device. Furthermore, the data conferencing device according to claim 20 comprising a receiver to establish the voice call session between the local site and the remote site. 21. The data conferencing apparatus of claim 20 , wherein transmitting a signal during the voice call session includes transmitting an audio signal representing a network access code that is generated electronically. Data conferencing system of claim 22 wherein the electronically audio signal generated contains a series of DTMF tones. 21. The data conferencing apparatus according to claim 20 , further comprising an input key and, when manually activated , starts a negotiation process for transmitting a network access code during the voice call session . 25. The data conference apparatus according to claim 24 , wherein the input key is manually activated to establish the data communication session. The data conference method according to claim 24 , wherein the input key includes a push button. 21. A data conferencing apparatus according to claim 20 , further comprising a speakerphone having a telephone keypad. 21. The data conferencing apparatus according to claim 20 , further comprising at least one network cable that terminates at a network connector and is retractable into the housing when not in use . 21. The data conferencing apparatus of claim 20 , further comprising a PC-video-IN connector for mounting an image source. Image source, and the wireless device and data conferencing system of claim 20, further comprising a wireless network module configured to perform wireless communication between the data conferencing device selected from the infrastructure wireless networking access points . Moreover, a speakerphone, on of the speakerphone - hook / off - controlling the hook and data conferencing system of claim 20 comprising a toggle switch speakerphone. And an image processing subsystem that communicates with the network interface, the image processing subsystem receiving the compressed image data and compressing the compressed image data before displaying it through the projection device. 21. The data conferencing device of claim 20 , configured to cancel. Furthermore, comprising an image processing subsystem to communicate with the network interface and the projection device, the image processing subsystem is configured to receive image data which is not compressed, the image data before transmitting over the data network is configured to compress further the image processing subsystem, the compressed image data with received via the data network, compresses the image data the compressed, before displaying through the projection device data conferencing apparatus according to claim 20, which is configured to release. The data conferencing apparatus according to claim 20 , wherein the projection device has pixel resolution,
Further, the image processing includes a subsystem, the image processing subsystem to communicate with the projection device, the size which receives the image data, the image data to match the pixel resolution before displaying through the projection device Data conferencing device to change .

Images