• Hypercomplex signals and systems
• Multirate systems
• Applications in Communications Engineering
• Digital Filters

2010

• T. Kurbiel, D. Alfsmann and H. G. Göckler. Iteratively Reweighted Design of Oversampling Complex-Modulated Filter-Banks for High Output-Signal Quality. Proc. EURASIP 18th European Signal Processing Conference (EUSIPCO-2010), pp. 2171-2175, Aalborg, Denmark, 2010.
• H. G. Göckler and D. Alfsmann. Efficient Linear-Phase Directional Filters with Selectable Centre Frequencies. Proc. The First International Conference on Green Circuits and Systems (ICGCS 2010), pp. 293-298, Shanghai, China, June 2010.
• S. J. Sangwine and D. Alfsmann. Determination of the biquaternion divisors of zero, including the idempotents and nilpotents. Advances in Applied Clifford Algebras, Vol. 20, No. 2, pp. 401-410, doi:10.1007/s00006-010-0202-3, May 2010. The original publication is available at www.springerlink.com.
• D. Alfsmann and H. G. Göckler. Frequency-domain magnitude constraints for oversampling complex-modulated NPR filter bank system design ensuring prescribed signal-to-distortion ratio. Electronics Letters, Vol. 46, Issue 3, pp. 205-206, doi:10.1049/el.2010.3283, 4 Feb. 2010.

2009

• T. Kurbiel, H. G. Göckler and D. Alfsmann. A Novel Approach to the Design of Oversampling Low-Delay Complex-Modulated Filter Bank Pairs. EURASIP Journal on Advances in Signal Processing, vol. 2009, Article ID 692861, 13 pages, doi:10.1155/2009/692861, 2009.
• D. Alfsmann, H. G. Göckler and T. Kurbiel. Filter Banks for Hearing Aids applying Subband Amplification: A Comparison of different Specification and Design Approaches. Proc. EURASIP 17th European Signal Processing Conference (EUSIPCO 2009), pp. 2663-2667, Glasgow, UK, 2009.
• T. Kurbiel, H. G. Göckler and D. Alfsmann. Oversampling Complex-Modulated Digital Filter Bank Pairs Suitable For Extensive Subband-Signal Amplification. Proc. EURASIP 17th European Signal Processing Conference (EUSIPCO 2009), pp. 2658-2662, Glasgow, UK, 2009.
• C. Stöcker, T. Kurbiel, D. Alfsmann and H. G. Göckler. A Novel Approach to the Design of Oversampling Complex-Modulated Digital Filter Banks. Proc. EURASIP 17th European Signal Processing Conference (EUSIPCO 2009), pp. 2648-2652, Glasgow, UK, 2009.

2008

• D. J. Alfsmann and H. G. Göckler. Dual Number Subalgebras mapped to Digital Signal Processing Structures. Proc. Eighth International Conference on Mathematics in Signal Processing, pp. 129-132, The Royal Agricultural College (Slides), Cirencester, UK, 16-18 December 2008.
• S. J. Sangwine and D. Alfsmann. Determination of the biquaternion divisors of zero, including the idempotents and nilpotents. arXiv:0812.1102 preprint, 2008.
• T. Kurbiel, D. Alfsmann and H. G. Göckler. Design of Highly Selective Quasi-Equiripple FIR Lowpass Filters with Approximately Linear Phase and Very Low Group Delay. Proc. EURASIP 16th European Signal Processing Conference (EUSIPCO 2008), Lausanne, Switzerland, 2008.

2007

• D. Alfsmann, H. G. Göckler, S. J. Sangwine and T. A. Ell. Hypercomplex Algebras in Digital Signal Processing: Benefits and Drawbacks (Tutorial). Proc. EURASIP 15th European Signal Processing Conference (EUSIPCO 2007), pp. 1322-1326, Poznań, Poland, 2007.
• D. Alfsmann and H. G. Göckler. On Hyperbolic Complex LTI Digital Systems. Proc. EURASIP 15th European Signal Processing Conference (EUSIPCO 2007), pp. 1332-1336, Poznań, Poland, 2007.

2006

• D. Alfsmann. On Families of 2^N-dimensional Hypercomplex Algebras Suitable for Digital Signal Processing. Proc. EURASIP 14th European Signal Processing Conference (EUSIPCO 2006), Florence, Italy, 2006.

2005

• D. Alfsmann and H. G. Göckler. Design of Hypercomplex Allpass-Based Paraunitary Filter Banks applying Reduced Biquaternions. Proc. EUROCON 2005, pp. 92-95, Belgrade, Serbia & Montenegro, 2005.