Large Group Videoconferencing
Webcams and desktop videoconferencing software will work for videoconferences where one site has a large group of people; however, in this type of situation several additional factors need to be considered. The ideal scenario for a large group to participate in a videoconference is in a location equipped for such a task. The information listed below details the additional factors that must be given consideration when planning a video conference where one or more sites has a large group of people.
Viewing Remote Sites
If everyone in the group is to be able to see the remote participants, some type of image magnification or projection system is required. In some cases this can be a shared system that is also used to display presentation materials to be shown to the local large group, but during those times the remotes sites would not be visible. This arrangement also requires someone to switch back and forth between the videoconference display and the local presentations.
Another alternative would be to provide a separate large display dedicated to showing the remotes sites. This does, however, increase the cost and complexity of the media support required.
Audio To/From Remote Sites
When a large group needs to interact with remote participants, it is generally not feasible to use a standard headset or free-standing computer microphone. Instead, one or more mics (usually placed on the conference table) are used to pick up the audio and transmit it. However, group participants will need to be sure that they are speaking clearly and that the remote sites can hear the group discussion.
Likewise, audio coming from the remote sites will need to be sent to some type of sound reinforcement system so that the group can hear clearly. This has the potential to cause feedback problems unless the equipment is chosen and placed carefully. Some conferencing microphones are able to control an attached speaker and mute it automatically to avoid feedback. Barring that, careful placement of the sound system elements and/or an onsite audio operator may be required.
Group Video
Most webcams, particularly those that are built into laptop systems, are not designed for general video work. They have a limited focus range and are intended to show the face of someone sitting directly in front of the computer. The only way to show a group of people is to point the computer toward them.
External cameras (connected to the computer via a USB cable) do at least allow for more flexible positioning, but may be difficult to reposition to show different speakers. Some, however, do have a motorized base that allows them to be panned and tilted via software on the videoconferencing computer. This would generally require an operator unless one of the participants is comfortable with taking on this added task.
Considering these additional factors, it is best to find a location equipped and staffed for this purpose in order to achieve the best results. Facilities for large group videoconferences are available on the Iowa State campus through IT Services. Portable equipment for setting up a small group videoconference, such as in a classroom, is also available through IT Services.
