Search results

The paper deals with the design and creation of an intelligent user interface augmenting the user experience in everyday environments, by providing an immersive audio environment. We highlight the potential of augmenting the visual real environment in a personalized way, thanks to context modeling techniques. The LISTEN project, a system for an immersive audio augmented environment applied in the art exhibition domain, provides an example of modeling and personalization methods affecting the audio interface in terms of content and organization. In addition, the different evolution steps of the system and the outcomes of the accompanying user tests are here reported.

The authors have developed the “Ethernet Speaker” (ES), a network‐enabled single board computer embedded into a conventional audio speaker. Audio streams are transmitted in the local area network using multicast packets, and the ES can select any one of them and play it back. A key requirement for the ES is that it must be capable of playing any type of audio stream, independent of the streaming protocol, or the encoding used. The authors achieved this by providing a streaming audio server built using the kernel‐based audio stream redirector (ASR) in the OpenBSD kernel. The ASR accepts input from any of the existing audio file players, or streaming audio clients. Since all audio applications have to be able to use the system audio driver, this system can accommodate any protocol or file format, provided that there exists some compatible player running under OpenBSD. This paper discusses the design and implementation of the server as an ASR, the streaming protocol developed for this application, and the implementation of the client.

The distinction between digital and analog data, the specific advantages of analog storage and the use of optical discs to store analog data are detailed. The configuration and potential of Level One, Level Two, and Level Three laser disc systems are explained. Side bars address: 1) selection of display devices for use with laser disc systems, and 2) laser disc systems for accessing audio data.

The purpose of this paper is to describe a case study of developing a web service that will act as an intermediary between the Audio Library system for the visually impaired and the library management systems. The Audio Library is based on speech recognition and text-to-speech engines and it produces synthesized speech from various electronic materials. It has its own database with a limited number of books and textual materials. Web services described in this paper should enable access to a larger number of electronic resources provided by libraries.

In this paper, the author specified software architecture of a web service analyzing different approaches for search and retrieval.

Web service described in this paper is the first software solution addressing the problem of lending e-books in Serbia. It aggregates collections of different libraries in a single access point for the Audio Library system. In this way, users of the Audio Library system are provided with larger number of electronic resources.

Communication between the Audio Library and this web service is achieved by using standardized protocols for exchanging library data. However, those protocols did not fulfill all necessary requirements, so the authors propose some extensions to overcome those issues.

This study investigates the impact of online synchronous audio and video systems on the performance of cooperative learning in decision making and intellective tasks.

In total, 156 subjects, divided into 46 groups, were invited to resolve decision and intellective tasks in text messaging and audio conferencing e‐learning environments.

For decision‐making tasks, audio conferencing has a significant impact on cooperative learning satisfaction but not on learning performance; while for intellective tasks, neither audio conferencing nor text messaging has an impact on cooperative learning outcomes. There are no cross‐effects between platforms and task types on cooperative learning outcomes. The results indicate that the main effects of platforms and task types are independent. In other words, the impact of platforms on group discussion processes can be examined without the need of considering task types, since the latter will not affect the impacts of platforms.

The main effects of information richness and task types are independent. Major limitation is that the student sample may not be sufficiently representative to allow wider generalization of the findings of this study.

The main effects of information richness and task types are independent as far as learning outcomes are concerned. The learners' attitude toward the synchronous learning system significantly affects the satisfaction of synchronous online cooperative learning.

This study uses empirical data to validate the hypothesized relationships between the independent variables of online synchronous learning systems (audio‐ and text‐based), the moderating variable of task types (decision making vs intellective) and the dependent variable of learning outcomes.

This work aims to argue that it is possible to address discrimination issues that naturally arise in contemporary audio CAPTCHA challenges and potentially enhance the effectiveness of audio CAPTCHA systems by adapting the challenges to the user characteristics.

A prototype has been designed, called PrivCAPTCHA, to offer privacy-preserving, user-centric CAPTCHA challenges. Anonymous credential proofs are integrated into the Session Initiation Protocol (SIP) protocol and the approach is evaluated in a real-world Voice over Internet Protocol (VoIP) environment.

The results of this work indicate that it is possible to create VoIP CAPTCHA services offering privacy-preserving, user-centric challenges while maintaining sufficient efficiency.

The proposed approach was evaluated through an experimental implementation to demonstrate its feasibility. Additional features, such as appropriate user interfaces and efficiency optimisations, would be useful for a commercial product. Security measures to protect the system from attacks against the SIP protocol would be useful to counteract the effects of the introduced overhead. Future research could investigate the use of this approach on non-audio CAPTCHA services.

PrivCAPTCHA is expected to achieve fairer, non-discriminating CAPTCHA services while protecting the user’s privacy. Adoption success relies upon the general need for employment of privacy-preserving practices in electronic interactions.

This approach is expected to enhance the quality of life of users, who will now receive CAPTCHA challenges closer to their characteristics. This applies especially to users with disabilities. Additionally, as a privacy-preserving service, this approach is expected to increase trust during the use of services that use it.

To the best of authors’ knowledge, this is the first comprehensive proposal for privacy-preserving CAPTCHA challenge adaptation. The proposed system aims at providing an improved CAPTCHA service that is more appropriate for and trusted by human users.

This research is based on the hypothesis that the supply of appropriate perceptual and conceptual information through compensatory sensorial channels may assist people who are blind with anticipatory exploration. The two main goals of the research are: evaluation of different modalities (haptic and audio) and navigation tools; and evaluation of spatial cognitive mapping employed by people who are blind.

In this research the BlindAid system, which allows the user to explore a virtual environment, was developed and tested. The research included four participants who are totally blind.

The preliminary findings confirm that the system enabled participants to develop comprehensive cognitive maps by exploring the virtual environment. The BlindAid system could be used as a training‐simulator for O&M rehabilitation training, as a O&M diagnostic tool, and to support people who are blind in exploring and collecting spatial information in advance.

This preliminary study aims to highlight which VE properties could provide perceptual and conceptual spatial information and allow users who are blind to gather and expand their spatial information.

This article describes a system that produces web based learning modules as a by‐product of regular classroom teaching. The lecturer uses a pen sensitive display in place of the traditional chalkboard. In addition to drawings, the electronic chalkboard handles a range of multimedia elements from the Internet. The system records all actions and provides both a live transmission and a replay of the lecture from the web. Remote students follow the lecture looking at the dynamic board content and listening to the recorded voice of the instructor. Several use cases of the system as well as a systematic evaluation in two universities are presented.

This paper aims to describe a working routine for the analysis of audio‐visual documents for serving the needs of television journalists.

A description in the form of a synthesis is given of the process by which television information must be put at the user's disposal with a response that is both fast and exhaustive.

In television, there is a need to adapt the habits and methods of documentation to the productive processes of journalists in order to attain the common goals of information retrieval and reuse of the documents.

The main drawback of using this working method lies in the intensive use of large numbers of personnel with knowledge in specific areas.

Well‐designed hypermedia management based on knowledge of the creation processes in television will allow the construction of an information management system that adds value to the documents that have been analysed and facilitates the organisation's creation of future audio‐visual products.

It is hoped that readers use this paper in a critical spirit to adapt it to their own particular requirements, and to serve as a guide both for setting up a document/information system and for organising such departments within the TV industry.

The purpose of this paper is to examine the past 15 years of research and development (R&D) on the role of virtual environments (VEs) as an orientation and mobility (O&M) aid to enhance skills and to train people who are blind or newly blind.

This paper describes and examines studies of 21 VE systems developed specifically to help people who are blind improve their O&M skills. These VE systems, equipped to supply appropriate perceptual and conceptual spatial information through haptic and auditory sensorial channels, are mainly focussed on two goals: helping congenitally blind or late blind persons to collect spatial information in advance and supporting people who are newly blind in practicing their O&M skills during rehabilitation. The R&D studies represented in these 21 studies were examined along three dimensions: descriptive information, system, and research.

This paper highlights weaknesses and strengths of VE systems that have been developed in the past 15 years as O&M aids for people who are blind. These results have the potential to influence future R&D in this field.

The author hopes that this paper will influence future R&D in this field and lead to accessible O&M VEs in practice and research.