Hybrid Lecture Hall Use

Central lecture halls are equipped with hardware. This allows interaction and communication with online participants in addition to live streaming from the lecture hall. In the list lecture halls, you can use an online meeting for hybrid delivery.

Basic use

For basic use, a webcam, available lecture hall microphones, and the visualizer are available on site for use in Zoom and MS teams.

You must bring your own laptop for use. Internet access is usually wired via LTA access. Where there is no such access, the KIT WLAN can be used.

Contact persons at the ZML
Andreas Sexauer
Phone: +49 721 608-48215
E-mail: andreas.sexauer∂kit.edu

Dr. Carolin Henken
Phone: +49 721-608-48204
E-mail: carolin.henken∂kit.edu

Supplementary use of the blackboard

If work is to be done with the blackboard in the lecture hall, this is possible in principle. However, a suitable camera must be added and aligned with the whiteboard on your own responsibility. In Zoom & Co, this camera image is additionally used in screen sharing as a second camera to show the blackboard. In this way, a double blackboard (two blackboard surfaces on top of each other) can be streamed in a legible manner. In large lecture halls (e.g. Benz- and Daimler-HS) this corresponds to one third of the entire blackboard area.

You will need your own camera with tripod for this, which can be used in Zoom via USB or HDMI to USB adapter. You set this up accordingly and start the permanent screen sharing. After that, you can work continuously on the whiteboard. It is only necessary to operate the video conference to moderate the chat or to switch to a slide presentation in the meantime.

Further possibilities

For events with demonstration of experiments, exhibits etc. the webcam is usually not sufficient. It should be possible to easily switch between another camera, the slide presentation, the visualizer and, if necessary, another source.

Using an additional video mixer, it is possible to switch reliably and conveniently between several HDMI sources during the presentation at the touch of a button. The signal mixed in this way is displayed in the lecture hall via the lecture hall system and at the same time released for external participants via a laptop (PC Zoom meeting) in Zoom etc. by screen release. This sharing does not have to be changed when changing the source. Audio in the lecture hall and in the video conference can also be played back simultaneously with the lecture via all sources.

For external participants, an additional image of the instructor is available in the video conference; this is not displayed in the lecture hall. The meeting will be controlled by an additional laptop, here an additional person will take over the moderation of the online participants. The implementation is outlined here (Sketch hybrid lecture with demonstration of experiments).

Approximately ten minutes should be allowed for set-up and dismantling. Depending on the degree of implementation, material costs between 500 and 1000 € will be incurred. Please contact elearning∂study.kit.edu to schedule a consultation with demonstration opportunity at your site to determine the appropriate combination of equipment for your specific needs.

Instructions and guidance.

Your own laptop as media control!

Unlike before, the control is primarily no longer done with the media control of the lecture hall, but on your laptop. There you create the desired display from the Visualizer image, your own content such as a presentation and elements from the Zoom return channel such as the chat. You output this presentation once to the beamer in the lecture hall and release it in Zoom as a stream. To make this possible, you get the Visualizer signal, the webcam and the microphone sound via USB cable. The output to the beamer is done via HDMI cable. Switching between different contents in the event is then done during the event on your end device in Zoom.

What content is possible?

Basically, you can use anything that can be displayed on your end device. This can be e.g. PowerPoint presentations or other screen contents. The image of the Visualizer is provided to you via USB as a second webcam. You can select this in Zoom in the screen sharing as a second webcam and show it in the livestream as well as on the beamer in the room. At the same time, you can show yourself in the stream using the webcam.

Is it also possible to record?

In principle, this is technically possible without any further hurdles. However, the requirements of data protection must be observed. Students must not be recorded. This would require written consent and administration for subsequent, targeted processing of individual deletion requests. Therefore, it is not possible to record parts in which students can be seen or heard. Alternatively, you can record the lecture portion and pause the recording in Zoom for several discussion sections in between. The individual sections recorded in this way are available at the end as one video file in one piece without post-processing.

Lecture halls without a suitable microphone

In a few lecture halls without a microphone system, you will need a suitable wireless microphone of your own so that students participating online can hear you.


For about 230 € you can buy the Hollyland Lark 150duo radio microphone (one receiver, two transmitters) can be recommended. It covers about three to four hours of use at a stretch. The case with integrated powerbank for charging the transmitter and receiver between lectures is particularly practical.


Alternatively, we have also had good experiences with the small wirelessRhode Wireless Go(approx. 200 €) made good experiences. Transmitter and receiver are small and light and have an operating time of several hours.


Both devices each have a built-in clip that allows the microphone to be easily attached to clothing. The receiver is attached to the laptop via a jack. If the laptop has a combined headphone and microphone jack with 4-ring on the plug, a Y-splitter adapter cable (<10 €) is needed that splits the headphone and microphone jack.

Notepad Zoom enable

Microphone icon (bottom left): One to several USB devices appear here. Select them one by one and check for which one you see a green color in the microphone icon when you tap on the microphone with mute removed.

Likewise, select the HDMI output of your laptop as the speaker here so that contributions from students connected online can also be heard in the room.

Camera icon (bottom left): Select the laptop's built-in webcam or the additional USB webcam you want to show. The camera device for the Visualizer also appears here, but is not selected here.

Share Screen (bottom center): This is where you share or switch between different content to display in the livestream. For example, you share your entire screen, a window of an application or documents under the Visualizer as content of the second camera. The sound and the screen sharing are recorded in each case.

HDMI output to the beamer: The beamer is connected via HDMI. Depending on your system and requirements, you can decide whether this should display the contents of your screen 1:1 or be used as a 2nd screen.

Tip Display PowerPoint presentation in window instead of full screen mode

A PowerPoint presentation can also be played back in a window if, for example, other content such as the chat history from Zoom is to be displayed on the beamer in addition to the presentation. To do this, select the setting "View through an individual (window)" under "Set up slide show" for "Type of presentation". Then the presentation will be displayed in its own window at startup and will no longer fill the entire display in full screen.