Sennheiser promotes training at Martin Luther University with its wireless systems

This top center in Germany uses the SpeechLine Digital Wireless series in its lecture and seminar rooms so that spoken voice is transmitted with the best possible audio quality.

Martin Luther University Halle-Wittenberg (MLU), It is the oldest and largest public university in the German state of Saxony-Anhalt, with more than half a century of training and research tradition, offering a wide range of academic subjects.

To improve the quality of spoken voice and audio in your lecture and seminar rooms, have installed the SpeechLine Digital Wireless series wireless systems from Sennheiser (brand that sells Magnetron in Spain), to currently manage nothing less than 53 channels in the DECT band.

These systems have been distributed on several MLU campuses, where they have gradually settled in recent years, since the conversion of UHF to DECT frequencies has not yet been completed in the center, and an application has currently been submitted to purchase more wireless systems from Sennheiser.

By using the same type of wireless equipment at the University Plaza headquarters, and the Steintor and Weinberg campuses, as well as in the Francke Foundations, handling and maintenance is much simpler and less expensive.

Up to three SL Rack Receiver DW receivers are commonly used in the MLU teaching classrooms., along with wireless desktop microphones (SL Tablestand 133-S DW) and handheld or bodypack transmitters.

SL Handheld DW transmitters are equipped with MME supercardioid condenser capsules 865-1, while the SL Bodypack DW bodypack microphones are used with lapel or headset microphones. Lavalier microphones (Sennheiser MKE 1 with omnidirectional pickup pattern) They are always kept in the lecture and seminar rooms on the Weinberg campus..

For your part, SL Headmic headset microphones 1 (also omnidirectional), along with their corresponding bodypack transmitters, are delivered to teaching staff each semester, mainly for hygiene reasons, and are kept in their offices. In the rest of the MLU headquarters, transmitters are collected at a central delivery point.

Uniformity: DECT replaces UHF

The company was responsible for the supply and installation of Sennheiser's SLDW wireless systems. Studio-Elektroakustik from Leipzig, with specialist Bernd Schiller as project manager. Not MLU, UHF wireless transmission systems from various manufacturers have continually been replaced by Sennheiser's SpeechLine DW systems..

“The previous system mix was very heterogeneous and we had problems with individual frequencies at all of our sites,” explains Karsten Schröder., Responsible for equipping the lecture hall on the Weinberg campus.. After the reorganization of the radioelectric space in 2012, the frequency bands they assigned to us told us they were safe, but shortly after, “With the Second Digital Dividend we had to make changes and it was the reason why we rethought our strategy regarding the wireless equipment of the MLU”.

Sennheiser wireless technology is now available to teaching staff at all MLU locations. This philosophy of operational uniformity ensures that teachers can focus on their work, instead of worrying about how to operate multimedia equipment. The staff responsible for technical equipment at the MLU often must move from one location to another to provide support on holidays., among other things, and the new system reduces your workload.

SpeechLine DW in the lecture hall

The SpeechLine DW systems installed at the MLU work perfectly. As Karsten Schröder points out, so far there has been no interference with DECT phones and the inevitable latency of 19 milliseconds caused by the transmission process is also irrelevant.

The operating range of the SpeechLine DW system is also more than sufficient to cover the different room sizes of the MLU., since the antennas supplied with the system are used. Remote antennas are only used in the 'Lions building' auditorium, which uses up to six Sennheiser SpeechLine DW systems.

Among the internal DSP options offered by Sennheiser SpeechLine DW systems, voice-optimized equalization presets are used.: “in the teaching rooms used mainly by female teaching staff, We have activated this preset -explains Schröder-. However, We do not use either the seven-band graphic equalizer or the low-cut filter.”.

In practice, The fact that the Sennheiser SpeechLine DW system automatically adapts its input sensitivity to the level of the voice has proven to be very useful. As Schröder points out, AES encryption option not very useful on campus: “The largest lecture halls are equipped with AV systems to record lectures.”; therefore, If teachers give their consent, Content will increasingly be archived in digital format”.

In many lecture halls, the Sennheiser charging device (CHG charger 2 with two bays) It is kept in a locked drawer on the teacher's desk.. “The uptime offered by SpeechLine DW systems, with a fully charged battery, "It's incredibly long," says Schröder.. During the conferences, I am certain that the transmitters will work without problems”.

After use, teachers put the transmitters back on the chargers; a discipline that ensures that the batteries are always charged. “With SpeechLine DW we no longer waste time continually changing batteries”, recalca Karsten Schröder.

In the future, and in coordination with IT managers, The SpeechLine Digital Wireless systems used at the Martin Luther University of Halle-Wittenberg will form an integrated network that will interconnect the different locations of this center. With the Sennheiser Control Cockpit software you can easily remotely monitor and control all connected wireless systems.