Dionysios Politis

An audio signatures indexing scheme for dynamic content multimedia databases

This paper describes a method of content indexing for dynamic multimedia databases using binary signatures of the audio signals. The analysis scheme focuses on the audio objects of the multimedia environment, extracts semi-stationary audio segments and analyzes their key features, These are: the fundamental frequency F0, the first three formants F1, F2, and F3, the associated phoneme and speaker identification information. Binary signatures are associated with the audio segments which they describe. For each audio segment these key features are encoded within the signature and information retrieval can be performed on the multimedia database querying the corresponding signatures of the streamed audio. The signature structure serves as an index of the associated audio objects assisting their retrieval.

E-Learning Methodologies and Computer Applications in Archaeology

Tools of data comparison and analysis are critical in the field of archaeology, and the integration of technological advancements such as geographic information systems, intelligent systems, and virtual reality reconstructions with the teaching of archaeology is crucial to the effective utilization of resources in the field. E-Learning Methodologies and Computer Applications in Archaeology presents innovative instructional approaches for archaeological e-learning based on networked technologies, providing researchers, scholars, and professionals a comprehensive global perspective on the resources, development, application, and implications of information communication technology in multimedia-based educational products and services in archaeology.

Socioeconomic and Legal Implications of Electronic Intrusion

In the information society, electronic intrusion has become a new form of trespassing often causing significant problems and posing great risks for individuals and businesses. Socioeconomic and Legal Implications of Electronic Intrusion focuses on abusive and illegal practices of penetration in the sphere of private communications. A leading international reference source within the field, this book provides legal and political practitioners, academicians, and intrusion researchers with expert knowledge into global theft and spam perspectives, identity theft and fraud, and electronic crime issues.

MEL-IRIS: An Online Tool for Audio Analysis and Music Indexing

Chroma is an important attribute of music and sound, although it has not yet been adequately defined in literature. As such, it can be used for further analysis of sound, resulting in interesting colorful representations that can be used in many tasks: indexing, classification, and retrieval. Especially in Music Information Retrieval (MIR), the visualization of the chromatic analysis can be used for comparison, pattern recognition, melodic sequence prediction, and color-based searching. MEL-IRIS is the tool which has been developed in order to analyze audio files and characterize music based on chroma. The tool implements specially designed algorithms and a unique way of visualization of the results. The tool is network-oriented and can be installed in audio servers, in order to manipulate large music collections. Several samples from world music have been tested and processed, in order to demonstrate the possible uses of such an analysis.

Interpretation of Byzantine music notation as adaptive /spl Delta/-modulation

This paper presents a model for encoding the Byzantine music notation. The analysis is performed by inventing a universal code according to the model of PCM adaptive modulations and especially /spl Delta/ modulation. The proposed code is modular and can be used compressed or stripped for the analysis of musical notation as a morphogenetic field while fully augmented it serves as a musical interface capable of reproducing Byzantine melodies in solfege or instrumental mode. Such an execution can be achieved by special computer programs-synthesizers developed in our department that employ as basis for their interpretation algorithms the proposed encoding-decoding methodology scheme.

variPiano™: A parametric design variable piano visualizing a differential tuning mobile interface

This paper introduces the framework of mobile Computer Music interfaces within the context of Human Computer Interaction (HCI). It examines the unique problems posed by the use of computers by composers and performers of music. It emphasizes on the new various interfacing protocols, metaphors and paradigms that apply HCI design methodologies on the world of music, producing special modules like: performance instruments, digital audio processing tools, haptic - adaptable interfaces. A presentation of the basic concepts involved in the Computer Music world prevails the discussion on the evaluation criteria for Computer Music interfaces. New criteria are introduced, like knowledge representation of musical data and alternate musical interfaces materialization. A survey of various systems, based on the previously mentioned criteria is committed.

Dialectic & reconstructive musicality: Stressing the brain-computer interface

This paper focuses on the framework of non-deterministic mobile Computer Music Interfaces within the context of Human Computer Interaction. A very special subgroup of these interfaces, emerging from the subconscious, comprises the Brain Computer Interfaces that affirmatively expose direct manipulation techniques. Short and long memory experiments with musical exploitation can prove shortcomings in inner-knowledge handling and provide understanding of how the language mechanism provides steady, un-biased speech.

Implementing E-Justice on a National Scale: Coping with Balkanization and Socio-Economical Divergence

The world of justice is undergoing drastic changes that commenced about a decade ago. Trends in an effort for enterprise like management, along with the advent of information and communication technologies, have culminated in a strong imperative for technological and organizational reforms. However, justice is not simply another sector for e-government implementations. Justice is an autonomous function of democratic regimes that not only interprets laws but also poses restrictions and preconditions on how electronic systems are implemented with concern for the protection of constitutional and civil rights. Multiple types of relationships have been developed between politicians, administrators, technological infrastructure providers, and businesses, converting the roadmap for e-justice implementation from a mere quantified investment on content and organization to a complex strategy involving broader social and economical modeling techniques. Using case studies in three Balkan countries this research illustrates the problems in applying e-justice on a national scale.

Emulation of ancient greek music using sound synthesis and historical notation

Music Using Sound Synthesis and Historical Notation Dionysios Politis,∗ Dimitrios Margounakis,∗ Spyridon Lazaropoulos,∗ Leontios Papaleontiou,∗ George Botsaris,∗ and Konstantinos Vandikas† ∗Multimedia Lab, Department of Informatics Aristotle University of Thessaloniki, University Campus GR-541 24 Thessaloniki, Greece {dpolitis, dmargoun}@csd.auth.gr lspiros1980@yahoo.gr leontiosp@yahoo.com geobotsar@hotmail.com †Computer Science Department, University of Crete P.O. Box 2208 Heraklion, Crete, GR-714 09 Greece vandikas@ics.forth.gr

Neurophysiology-Based Acoustic Measurements of Singing Contours

This research focuses on how singing is perceived when amplifying mechanisms vastly enhance its energy contours. This is especially true in big auditoriums, churches or outdoor performances. In practice, the singing voice is altered in its phonetic characteristics. The same time, the listener’s perceptional sensory mechanisms are affected, and in terms of neurophysiological processes, an altered acoustic form is received. Apart from these findings, a new unit for evaluating the equivalent to pure acoustic singing is proposed, when using instrumentation to amplify phonation.