Curriculum Vitae

Education

Doctor of Technology (with honours), Electrical Engineering, Tampere University of Technology, Finland, August 21, 2002. Thesis title: Optimization of Digital Filters for Practical Implementations. Opponents: Prof. Yong Ching Lim (National University of Singapore, Singapore) and Prof. Timo Laakso (Helsinki University of Technology, Finland).

Master of Science, Electrical Engineering, Tampere University of Technology, Finland, June 12, 1998. Thesis accepted with grade 5 (excellent).

Publications

Four invited book chapters, ten refereed journal articles and 47 refereed conference papers. List of publications (pdf-file).

Research Grants and Awards

Postdoctoral position, Academy of Finland, 1.8.2004 – 31.7.2006.
Postdoctoral position, Tampere Graduate School in Information Science and Engineering, Tampere University of Technology, 1.8.2002 – 31.12.2003.
Regular position, Tampere Graduate School in Information Science and Engineering, Tampere University of Technology, 1.1.1999 – 31.7.2002.
Best paper award of the Special Issue entitled, Frequency-Response Masking Technique, of the Journal of Circuits, Systems, and Computers, 2003.

Fields of Specialization

Low-complexity implementations: Research work on computationally-efficient and low-sensitivity structures for both the finite-impulse response (FIR) and infinite-impulse response (IIR) filters, the development of efficient algorithms for the digital filter design, and the design of digital filters requiring a small number of arithmetic operations for the floating-point and fixed-point arithmetic implementations.

Multirate filtering: Various interpolator and decimator designs for sigma-delta A/D and D/A converters. Low-complexity frequency-selective filters utilizing multirate filtering, e.g., frequency-response masking (FRM) filters. General sampling rate converter based on Farrow structure. Multirate vestigial sideband (VSB) filter design utilizing multirate signal processing and digital mixing.

VLSI implementations: Optimization of multiplication-free digital filters and filter banks for various applications, thereby leading to highly customized very-large-scale integration (VLSI) implementations.

Audio signal processing: Optimization of DSP algorithms for MIDI decoder and ogg-vorbis encoder. Design and implementation of parametric equalizer for high-quality audio signal processing. Design of phase vocoder for pitch shifting and time stretching.

Adaptive algorithms: Adaptive noise cancellation (ANC) and adaptive feedback cancellation (AFC) for audio applications.

Trigonometric transforms: Discrete trigonometric transforms (FFT, DCT, and MDCT) for audio compression, spectral analysis, and spectral processing.

Charge-domain signal processing: System level design of analog front-end for reconfigurable multi-standard receiver based on charge-domain sampling and passive switched-capacitor discrete-time signal processing.

Optimization and approximation theories: Basic theory of convex (LP, QP, SOCP, SDP, and GP), non-convex (SQP), and stochastic optimization algorithms (genetic algorithms and simulated annealing). Use of the above mentioned optimization algorithms in practical problems including optimization of multirate filters, adjustable fractional delay filters, frequency-response masking (FRM) filters, lattice wave digital filters, filters with variable magnitude characteristics, multiplierless filters, pipelined digital filters, IIR filters implemented as a tapped cascaded interconnection of identical all-pass subfilters, and analog filters.

Adjustable fractional delay filters: Efficient FIR and IIR structures for generating filters with adjustable fractional delay.

Related Skills

Programming Languages: Matlab, Fortran, c, Maple, Octave, and Assembly language.

Document Preparation: LaTeX, FrameMaker, LibreOffice, OpenOffice, and Scribus.