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Telepresence and virtual presence differ in that in telepresence people are virtually present in real places, whereas in virtual presence a virtual space is used. Telepresence can be seen as a developmental stage of videoconferencing. Telepresence uses two different techniques: one for videoconferencing on personalcomputers at the workplace in virtual spaces, and the other for presentations in mixed reality, mixed reality( MR), a symbiosis of virtuality and real objects and people.

  1. Telepresence on personal computers: While videoconferencing takes place in specially equipped rooms, telepresence involves individual, smaller videoconferencing systems running on personal computers. The prerequisites for personal telepresence at the workplace are provided by the performance of today's personal computers, laptops and notebooks, and the infrastructural prerequisites are provided by the high data transmission rates offixed and mobile networks. One major difference compared to videoconferencing systems is video compression. While video conferencing systems use H.264/ AVC(Advanced Video Coding) for video compression, telepresence systems rely on H.264/ SVC (Scalable Video Coding). The advantage here is that each participant is captured with its own video or web camera and displayed in a refereed manner. Instead of multipoint control units( MCU), telepresence systems work with video switches.
  2. Telepresence with virtual participants: Whereas video conferences are generally limited to voice communication with discussion partners and the video display of conference topics and documents, in telepresence the discussion participants are virtually present. They are therefore video conferences with virtual participants. Such meetings do not have to be meticulously planned, but can be convened spontaneously. As a presentation technique, the hologram takes the place of one or more large- area screens. The decisive difference lies in the representation: In the case of the video conference it is the two-dimensional large screen representation, in the case of telepresence it is the quasi three-dimensional realistic hologram, which is generated by a holographic display. Telepresence
    with virtually superimposed people, video by Cisco

    with virtually superimposed people, video by Cisco

    The participants of a telepresence are more than just people displayed on screens, they are realistic conference subjects that can be displayed life-size, depending on the projection technology. The playback technology, which uses several large flat screens, naturally requires 3D recording technology. The same applies to the sound. To ensure that each telepresence participant's voice can be clearly assigned, perfect surround sound is indispensable.
Englisch: telepresence
Updated at: 17.07.2018
#Words: 376
Links: virtual presence (ViPr), space (SP), mixed reality (MR), magnetic resonance (MR), performance
Translations: DE

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