The DSS team was invited to participate in the last of the "Saturday Morning Physics" (SMP) events in 2018. On December 8th, a Saturday of course, Thorben Kaak, Gerhard Schmidt, and Owe Wisch gave a talk on underwater signal processing. Pupils from all around Schleswig-Holstein were quite interested, especially in the basics of SONAR systems.
On Friday, 16th of December the DSS team took part in the "Night of the Profs 2018". We got one of the "late-night" slots, meaning that our contribution started at 23 h. Our topic was on speech communication in "unusual" environments. If course, our attempts to improve speech communication in cars was presented, but also some of our student projects, such as the under water masks for the commucation among divers or swimmers. We presented the problems that one faces when building systems to support communication in such environmens. Since we are engineers, also appropriate solutions as well as examples of real systems were shown. All in all, our contribution was not too bad since at the end of the talk (which was close to midnight), most (hopefully all) of the listeners were still awake.
At the beginning of the talk one of the external microphones did not work as expected - which was the reason for sharing microphones with the people from the Fachschaft (see picture on the left).
At the end of October (24.10.2018 till 27.10.2018) we spent again a few days on the island Sylt to reflect our past, current, and future research work. This included all Ph.D. topics but also the general direction of our research. Of course, also teaching and team related issues were discussed. Beside all that official work we also enjoyed the time on that beautiful island with several common activities.
Last Wednesday (17.10.2018) we obtained our first audiometer. With this audiometer we are able to conduct both pure-tone audiometry up to 12.5 kHz and basic speech intelligibility tests. The tests may be perfomed for either air/bone conduction or in the free field. Now we can analyze the hearing capabilities of our test subjects, which will help us when performing subjective tests. Special thanks to the DFG for financial support for the audiometer.
Congratulations to Wiebke and Marco to their first baby. We don't want to share too much information about size and weight of young Jonte, since it has something of this card game "Quartett" that we played in our youth. Anyhow, we were pretty impressed by both numbers!
One sentence about the title of this article: it's hard to see in the picture, but we ordered rompers for Jonte with the letters "> HELLO WORLD." on it. We are engineers, sorry.
Marco and Wiebke, enjoy now the time with little Jonte - we wish all three of you all the best.
On Monday, 10th of September 2018, Philipp Bulling sucessfully defended his dissertation on speech enhancement for in-car communication systems. His work focused mainly on the control of adaptive feedback cancellation filters (details can be found here). After an excellent talk Philipp gave very good answers to the questions of the committee and at around 11:30 h everythings war over and we had a small celebration (thanks also to Philipp's parents for preparing that part of the defense). An finally of course: contratulations to Philipp - very well done!
Last Friday we clebrated our yearly summer event in combinantion with the summer meeting of the Gesellschaft für angewandte Signalverarbeitung e.V. First, the year was reviewed from the perspective of the professors (talk from Gerhard Schmidt), the Ph.D. students (talk from Finn Spitz), and the bachelor and master students (talk from Jonas Weiss and Alexander Wilbrandt). Afterwards Eric Elzenheimer (as beeing member of the executive Committee of GaS e.V.) handed over the price for the best thesis in the area of applied signal processing to Tobias Klawonn (congratulations once again). Finally, Michael Klein from the company Berner talked to the audience before we had our yearly barbecue and our get-together. This year also the weather was really nice, allowing us to stay outside until late night.
Anton and Alexej are ready now with the preparation of our new low-delay hardware for our embedded lab. The hardware, so-called bela boards, can handle up to 10 inputs and 10 outputs and can operate with a round-trip delay of about 1 ms. The boards are programmed in C/C++ and allow for very "nice" audio examples.
Currently we implement speech enhancement algorithms, anti-noise systems, and virtual reality approaches (in terms of "audio-only reality") as student projects using the boards.
If you are interested, have a look on the website of our new embedded lab that will start in the winter term 2018/2019.
On July, 19th we christened our (first) small ship. It got the name "MISSy", which stands for "MIMO SONAR System". We did this at the "Kitzeberger Strand". Beside having a small party due to the event, we also did several measurements. One of them was testing a first version of our underwater telephone system. One subscriber was located at the pier, while the second one were Thorben and Alexej cruising with MISSy about 100 to 200 m in front of the pier. We had quite good signal quality, even when operating in so-called full-duplex mode (both subsribers can talk simultaneously). Several people tested the phone - even very young ones, as you can see on the picture.
Thanks again to all people who helped us to let MISSy see finally the water (Matthias, Martin, Dietmar, Jan, and all the others).
Starting this winter term the DSS group offers a new lecture entiteled "Fundamentals of Acoustcs". The lecture is given by Dr. Jan Abshagen (see picture). It will be a 3+1 lecture which takes place once a week. The lecture will cover the following topics:
- fundamentals of vibrations,
- theory of sound fields,
- sound and systems,
- sound-structure interaction,
- ship acoustics,
- acoustic sensor systems,
- underwater noise measurement,
- impulsive underwater noise ,
- oceanographic instruments.
Further details can be found here.
On Friday, 29th of June, the Faculty of Engineering had the traditional summer event. During that event also the best finshing students of each study programme were honored.
Christin Bald who started last year her Ph.D. in our group was the best finishing student in the Master programme "Wirtschaftsingenieurwesen". Christin, congratulations from all of us.
Furthermore, Seedo Paul, who attended virtually all of the DSS lectures and did also his master thesis with us (anti-noise helmets for fire fighters), was honered as well. Seedo was the best "finisher" in the Master programme "Digital Communications". Seedo, also congratulations from the entire DSS team.
On July, 28th we had our next test with MISSy. This time our second approach of our steering concept as well as the GPS module in KiRAT were tested in terms of hard- and software. Furthermore, we decided to go to an (for us) unknown beach area and see if we were able to put MISSy quickly and savely into water.
The "water test" including the test of our trailor extenstion was very successful. Everythink works as expected. However, we still had some ideas for further improvements - as usual.
Also the GPS module works as expected. We guess that we had an average error of 1 to 3 m, which is o.k. for us. Special thanks to Frederik Kühne, who implemented the GPS module as part of his Bachelor thesis. However, while using the module some ideas for further improvments came up.
Our new steering concept works much better comparted to the previous one. However, since rather strong forces appeare when steering MISSy our gear transmission was not strong enough. Well, something to do for the next test. Anyhow, we had a lot of fun while performing this next MISSy test.