This thesis consists of six publications and an overview of the research topic, which is also a summary of the work. The research described in this thesis concentrates on the design of phase-locked loop radio frequency synthesizers for wireless applications. In particular, the focus is on the implementation of the prescaler, the phase detector, and the chargepump. This work reviews the requirem...

In this paper, we try to describe the issues to be considered in developing a concatenative speech synthesizer for Amharic language. The complexity of the syllable structure of the language, the phonetic nature of the language and the result of the perceptual test of the synthesizer will be discussed. Comments and recommendations for further research are included.

There is often a mismatch between the high-level goals an artist wants to express and what the parameters of a synthesizer allow them to control. To enable composers to directly adjust personalized high-level qualities during sound synthesis, our system actively learns functions that map from the space of synthesizer control parameters to perceived levels of high-level qualities.

Restoring natural speech in paralyzed and aphasic people could be achieved using a Brain-Computer Interface (BCI) controlling a speech synthesizer in real-time. To reach this goal, a prerequisite is to develop a speech synthesizer producing intelligible speech in real-time with a reasonable number of control parameters. We present here an articulatory-based speech synthesizer that can be contro...

This paper describes the architecture of a new pure digital frequency synthesizer based on pulse generators, counters and a register. The technique described here is much simpler than other methods. The synthesizer presented is suitable for the design of VLSI architectures or for programmable large-scale integration circuits.

In this paper, we propose an all-digital frequency synthesizer architecture, based on an all-digital Σ∆-frequency discriminator. The new all-digital synthesizer is compared to previously published work. The architecture of the Σ∆frequency discriminator is verified using behavioral simulation.

Synthesizer programming interfaces are usually complex, discouraging novice users from exploring timbres outside the confines of "factory presets". This paper presents an alternative approach to synthesizer interfaces to enable novices to quickly find their target sound in the large, generative timbre spaces of synthesizers, while also allowing for exploration.