Research
Music analysis
- Pitch detection in monophonic and polyphonic music
- Key detection, onset detection, chord classification
Source Separation
- Estimation of source directions in stereo recording
- Separation of ambient and primary sound components
- Upmix from stereo to surround
BeaqleJS
HTML5/Javascript Framework for (MUSHRA) listening tests (GitHub)
Pitch-Shifting and Time-Stretching
Erweitertes PVSOLA
Publications
S. Kraft, U. Zölzer: „LP-BLIT: Bandlimited Impulse Train Synthesis of Lowpass-filtered Waveforms“, 20th International Conference on Digital Audio Effects, 2017, Edinburgh.
S. Kraft, U. Zölzer: “Automatic upmixing from 2-channel stereo to surround and 3D audio”, 29th Tonmeistertagung (TMT29), 2016, Cologne, Germany
S. Kraft, U. Zölzer: “Time-domain implementation of a stereo to surround sound upmix algorithm”, 19th International Conference on Digital Audio Effects, 2016, Brno, Czech Republic.
S. Kraft, U. Zölzer: “Low-complexity stereo signal decomposition and source separation for application in stereo to 3D upmixing”, 140th AES Convention, 2016, Paris, France.
S. Kraft, U. Zölzer: “Stereo signal separation and upmixing by mid-side decomposition in the frequency-domain “, 18th International Conference on Digital Audio Effects, 2015, Trondheim, Norway.
M. Fink, S. Kraft, U. Zölzer: “Downmix-compatibe conversion from mono to stereo in time- and frequency-domain “, 18th International Conference on Digital Audio Effects, 2015, Trondheim, Norway.
S. Kraft, U. Zölzer: “Polyphonic Pitch Detection by Matching Spectral and Autocorrelation Peaks”, 23rd European Signal Processing Conference (EUSIPCO), 2015, Nizza, France.
S. Kraft, M. Fink, und U. Zölzer: “Low-cost and downmix-comopatible mono-to-stereo upmnix”, Poster at 28th Tonmeistertagung (TMT28), Cologne, Germany, November 20-23, 2014
S. Kraft, U. Zölzer: “Polyphonic Pitch Detection by Iterative Analysis of the Autocorrelation Function “, 17th International Conference on Digital Audio Effects, 1.-5. September 2014, Erlangen.
S. Kraft, U. Zölzer: “BeaqleJS: HTML5 and JavaScript based Framework for the Subjective Evaluation of Audio Quality “, Linux Audio Conference, 1.-4. Mai 2014, Karlsruhe.
M. Fink, S. Kraft, M. Holters, U. Zölzer: “Load-balanced implementation of a delayless partitioned block frequency-domain adaptive filter “, 2. Workshop Audiosignal- und Sprachverarbeitung, 43. Jahrestagung der Gesellschaft für Informatik, 19. September 2013, Koblenz.
S. Kraft, A. Lerch, U. Zölzer: “The tonalness spectrum: feature-based estimation of tonal components “, 16th International Conference on Digital Audio Effects, 2.-5. September 2013, Maynooth, Ireland.
S. Kraft, M. Holters, A. von dem Knesebeck, U. Zölzer: “Improved PVSOLA time stretching and pitch shifting for polpyhonic audio “, 15th International Conference on Digital Audio Effects, 17.-21. September 2012, York. (Demo)
A. von dem Knesebeck, S. Kraft, U. Zölzer: “Realtime system for backing vocal harmonization ” 14th International Conference on Digital Audio Effects, 19.-23. September 2011, Paris.
A. von dem Knesebeck, S. Kraft, U. Zölzer: “A system for synthesis of backing vocals by intelligent harmonization.” 17th International Conference on Digital Signal Processing (DSP), 06.-08. July 2011, Corfu.
Teaching
Digital Communication Systems, exercise
Digitale Signalverarbeitung, laboratory exercise
Digitale Filter / Multimediasignalverarbeitung, laboratory exercise
Digitale Audiosignalverarbeitung, exercise
Supervised student work
J. E. Manitz: “VST-Plugin für räumliche Wiedergabe über Kopfhörer”, Masterarbeit, 2017
J.-T. Reimers: “Implementation of a time domain upmixing algorithm”, Projektarbeit, 2017
C. Bothner: “Extraction of Ambience from Stereo Signals with an NLMS Algorithm”, Masterarbeit, 2015
J. Cuesta: “Post-Processing of polyphonic pitch tracks”, Masterarbeit, 2015
C. Rädel: “Signal-Adaptive Time-Frequency Transforms”, Masterarbeit, 2015
C. Bothner: “Adaptive Störgeräuschunterdrückung mit Hilfe des Least Mean Square Verfahrens”, Studienarbeit, 2015
M. Stühmer: “Störgeräuschunterdrückung und Center-Extraktion in Mehrkanal-Audiodaten”, Masterarbeit, 2014
M. Stühmer: “Interaktive Quellenseparation in Stereodateien”, Studienarbeit, 2014
B. J. Leimert: “Entwicklung einer Methode zur Tonarterkennung unter Berücksichtigung der Stimmfrequenz”, Masterarbeit, 2013
C. de Obaldia: “Vowel recognition, mapping and reconstruction for short time speech synthesis”, Masterarbeit, 2013
B. J. Leimert: “Optimierung einer Pitch-Detektion durch Anwendung verschiedener Verfahren im Postprocessing”, Studienarbeit, 2013
S. Resenski: “Konzeptionierung und Implementierung eines Tempo-Tracking Algorithmus zur temporalen Beschreibung von Musik”, Studienarbeit, 2013
G. Calvo Hernández: “Frequency Domain Pitch Detection Algorithm based on the Harmonic Product Spectrum”, Masterarbeit, 2012
Letzte Änderung: 10. October 2022