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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

An RBFN-based system for speaker-independent speech recognition

Huliehel, Fakhralden A. 06 June 2008 (has links)
A speaker-independent isolated-word small vocabulary system is developed for applications such as voice-driven menu systems. The design of a cascade of recognition layers is presented. Several feature sets are compared. Phone recognition is performed using a radial basis function network (RBFN). Dynamic time warping (DTW) is used for word recognition. The TIMIT database is used to design and test the automatic speech recognition (ASR) system. Several feature sets using mel-scale filter bank (MSFB), smoothed FFT, reflection coefficients (also called P ARCORs), and cepstral features are extracted. The MSFBs outperform the other features considered in our study. Multilayer perceptrons (MLPs) and radial basis function networks (RBFNs) are considered for phoneme recognition. RBFN's are easier to train than MLPs so that RBFN's were selected to perform phoneme classification. Four RBFN's are compared: RBFN type-I is a single-layer RBFN, RBFN type-II is a two-layer net where the second layer consists of a vector of weights, RBFN type-III is a two-layer net where the second layer is a linear layer, and RBFN type-IV is a two-layer net where the second layer is a RBFN. RBFN type-II outperforms the others on the phone level where the phone recognition rate is about 44%. Using clustering techniques, a suboptimal, iterative and interactive algorithm is developed to train the radial basis functions (RBFs). An algorithm is developed to reduce segmentation errors in TIMIT. The TIMIT 60 phone set is reduced to a 33 phone set by merging similar phones. For 168 test speakers, 84% recognition rate is achieved on a vocabulary of 11 words from the sentence SAl ("she had your dark suit in greasy wash water all year") in TIMIT. For applications such as voice driven menu systems, the vocabulary words can be selected to be separable and distinct. A 95% recognition rate is achieved when the confusing words in the 11 words vocabulary are excluded to get an 8-word vocabulary. Real-time implementation of the proposed system can be achieved using a digital signal processor that can perform a multiplication within lOOns. / Ph. D.
2

Virtual Reality Menu Structures : How 2D and 3D menus affect the user experience in a virtual game environment.

Olsson, Atlas January 2022 (has links)
This thesis explores current guidelines for the development of menu systems in virtual reality with the main focus aimed toward gaming environments. These guidelines were gathered with the help of a literature study and two expert interviews. A game environment was created as a platform to test the systems. A 2D menu system and a 3D menu system were implemented with the help of gathered guidelines. The prototype was tested with participants in an experiment and empirical data was gathered and analyzed. The measured data shows minor differences in inefficiency, error rate, and learnability but a greater difference in immersiveness thus resulting in a subjectively preferred system to be 3D based.
3

Menu anchor interactors in mobile website contexts : The perceived usability of menu navigation on three different types of websites / Menyinteraktörer i mobila webbsidekontexter : Upplevd användbarhet av menynavigation på tre olika typer av webbsidor

Madejska, Annika, Persson, Alexander January 2019 (has links)
In 2018, there were 3.6 billion mobile internet users worldwide, which shows that digital designers have to tackle navigational patterns and menu anchor interactors for smartphone-sized screens early in their projects. As user satisfaction is crucial for the success of a website, and as successful navigation through a menu system is imperative to user satisfaction, the menu system is a key component in the UI. This study concerned three types of menu anchor interactors in smartphone UIs (Transient, Top persistent, and Navigation hub), on three website types (Single service, Brand, and Service directory). The goal was to investigate what influence the website type has on the user’s preferences of menu anchor itneractors. The theoretical base is previous research on menu systems in graphical UIs. The study was done by a questionnaire where the participants were presented images of three different menu anchor interactors on three different website types, and asked to score the assumed helpfulness of the menu anchor interactor from one to seven on a Likert scale. In addition, they were asked to clarify their scoring in a qualitative response. The key findings are that users prefer menu anchor interactors that display several navigation links, and that there are indications that the Top persistent menu anchor interactor works best on the Service directory website type, while Single service and Brand website types seem to benefit from a Navigation hub. However, the results also show the importance of studying UI components in their full UI context, as the whole UI affects the perceived usability of the menu anchor interactor. / 2018 fanns det 3,6 miljarder mobila internetanvändare i världen, vilket visar att digitala designers måste tackla navigationsmöster och menyinteraktörer till smarta telefoner och små skärmar tidigt i sina projekt. Då användarnöjdhet är avgörande för en webbsidas framgång, och då en lyckad navigationsprocess genom ett menysystem är nödvändig för användarnöjdheten, är menysystemet en nyckelkomponent i gränssnittet. Den här studien avser tre typer av menyinteraktörer (obeständig dold meny, beständig toppmeny och navigationshub), på tre typer av webbsidor (enskild tjänsteleverantör, varumärkessajt och tjänsteregister). Målet var att undersöka hur webbsidans typ påverkar användarens inställning till menyinteraktörer. Den teoretiska basen utgörs av tidigare forskning på menysystem i grafiska användargränssnitt. Studien genomfördes med hjälp av ett frågeformulär där bilder av tre olika menyinteraktörer på tre olika typer av webbsidor presenterades för deltagarna. De ombads att på en Likertskala från ett till sju bedöma hur hjälpsam den enskilda menyinteraktören uppfattas. Därtill ombads de att förtydliga sitt omdöme i ett kvalitativt svar. De viktigaste resultaten från studien visar att användare föredrar menyinteraktörer som visar flera navigationslänkar och det finns indikationer på att den beständiga toppmenyinteraktören fungerar bäst för webbsidor av typen tjänsteregister, medan sidor av typen enskild tjänsteleverantör och varumärkessajt gynnas av en navigationshub. Resultaten visar emellertid också vikten av att studera användargränssnittskomponenter i deras fullständiga gränssnittskontext, eftersom helheten påverkar den uppfattade användbarheten hon menyinteraktören.

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