Auditory modeling is a well-established methodology that provides insight into human perception and that facilitates the extraction of signal features most relevant to the human listener for coding applications. This thesis deals with the approach of `coding in the perceptual domain’ and is based on an invertible auditory model that provides a pulsed auditory representation…
Ten years after its infancy, digital watermarking is still considered as a young technology. Despite the fact that it has been introduced for security-related applications such as copyright protection, almost no study has been conducted to assert the survival of embedded watermarks in a hostile environment. In this thesis, it will be shown that this…
Novel iterative and recursive schemes for the equalization of time-varying fre- quency selective channels are proposed. Such doubly selective channels are shown to be common place in mobile communication systems, for example in second generation systems based on time division multiple access (TDMA) and so-called beyond third generation systems most probably utilizing orthogonal frequency division…
The focus of this thesis is on the binary signal detection problem, i.e., if a signal or signals are present or not. Depending on the application, the signal to be detected can be either unknown or known. The detection is based on some function of the received samples which is compared to a threshold. If…
The number of biometric applications has increased a lot in the last few years. In this context, the automatic person recognition by some physical traits like fingerprints, face, voice or iris, plays an important role. Users demand this type of applications every time more and the technology seems already mature. People look for security, low…
Objective diagnosis and therapy evaluation are still challenging tasks for many neurological disorders. This is highly related to the diversity of cases and the variety of treatment modalities available. Especially in the case of epilepsy, which is a complex disorder not well-explained at the biochemical and physiological levels, there is the need for investigations for…
Modern signal processing applications emerging in telecommunication and instrumentation industries need high-speed analog-to-digital converters (ADCs which can be achieved by employing a time-interleaved parallel array of ADCs (time-interleaved ADCs). The time interleaving of the channels allows to increase the sampling rate by the number of channels compared to a single channel. Unfortunately, time-interleaved ADCs suffer…
In this thesis we examine the autonomous oscillator model for synthesis of speech signals. The contributions comprise an analysis of realizations and training methods for the nonlinear function used in the oscillator model, the combination of the oscillator model with inverse filtering, both significantly increasing the number of `successfully’ re-synthesized speech signals, and the introduction…
In this work, a novel set of robust watermark-based error concealment (WEC) algorithms are proposed. Watermarking is used to introduce redundancy to the transmitted data with little or no increase in its bit rate during transmission. The proposed algorithms involve generating a low resolution version of a video frame and seamlessly embedding it as a…
The key defining feature of a software defined radio is the flexibility to reconfigure itself to different modes, frequency bands, or wireless standards. This is achieved by, for example, running software modules on a general purpose digital signal processor. The complexity of a common hardware platform shared by Bluetooth and a relatively costly wireless standard…
