Equipment of lecture halls and seminar rooms

The lecture halls mentioned on the other pages are temporarily upgraded with additional options for self recording and streaming. This does not affect the previous installation, which can be used independently of this as usual.

The installation uses an HDMI grabber to pick up the Visualizer signal and converts it into USB data that can be accessed on a computer like a webcam. The audio signal of the microphones in the lecture hall is also provided via USB audio card as far as possible. In addition, a USB web camera with a more suitable image section than the camera permanently installed in the laptop is provided for more freedom of movement. All signals are bundled via a USB hub and connected to the user's own end device via a USB cable (type A 2.0). The hardware uses standard drivers, which are usually part of the operating systems, so that no special drivers need to be installed. Nevertheless, it may be necessary to confirm these with administrator rights during commissioning. 

Using HDMI devices in Zoom & Co

HDMI signals up to 4k with max. 30 FPS, such as those from Visualizers, can be used via Video Capture Card HDMI to USB in Zoom or MS-Teams. These devices are now available for 10-20 € from computer retailers or online from various suppliers. We have successfully tested this Capture Card:

In Zoom, the HDMI device is then released in high resolution in the screen sharing under "Expand" as "Content from 2nd camera". Not to be confused with "Start Video" to start your own video picture.

Microphone for lecture halls without microphones suitable for zoom

Unfortunately, in some lecture halls the audio signal of the microphones on site could not be provided for use in Zoom for a short time. Unfortunately, you will have to bring your own microphone and connect it to your laptop for use in Zoom. Simple wireless microphones are suitable for this purpose, so that you do not get stuck on the cables. If you have already used a Bluetooth headset (e.g. Apple AirPods, Samsung or Microsoft Earbuds) with Zoom, it can also be used in this situation. Please check whether these are uncomfortable for you to use in the lecture hall situation. A pure wireless microphone is less intrusive. For example, we have had good experience with the small radio link Rhode Wireless Go(, approx. 200€). Transmitter and receiver are small and light and have an operating time of several hours. The transmitter has a built-in clip with which it can be easily attached to clothing. The receiver is attached to the laptop with a jack. If the laptop has a combined headphone and microphone connection with 4 rings on the plug, a Y-splitter adapter cable (<10€) is necessary to separate the headphone and microphone connection.

In the two tents (not in the other lecture halls!) you can bring your own headset. The headsets from Shure work here, the PGA31 model is recommended (

Videoconferencing systems for seminar rooms

The requirement here is, on the one hand, to make as many people as possible present audible and visible in the video stream, and, on the other hand, to make online participants on site audible to everyone. For such scenarios a simple conference system via USB connection can be used. These systems integrate a room microphone, a loudspeaker and a camera via a USB connection. As a rule, in small and medium-sized seminar rooms, contributions can be heard from all seats if there is sufficient speaking discipline. The systems have built-in echo cancellation and work directly with Zoom and MS-Teams.

For about 1000 € the Logitech Group System( or the Meeting Owl( from Owl-Labs can be used here. The Logitech Group System has a motorized camera with zoom function. The camera can be controlled via the remote control and up to four camera settings for different seminar situations can be easily stored.

The Meeting Owl, on the other hand, has an all-round camera and is placed in the middle of a meeting table. It automatically detects faces and combines these details into a magnified camera image. This means that a corresponding seating arrangement is necessary for this.