Sökning: "Björn Granström"

Hittade 5 avhandlingar innehållade orden Björn Granström.

1. 1. Accounting for Individual Speaker Properties in Automatic Speech Recognition

   Författare :Daniel Elenius; Björn Granström; Mats Blomberg; Torjbjörn Svendsen; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; MAP; MLLR; VTLN; speaker characteristics; dynamic modeling; child; Information and language technology; Informations- och språkteknologi;

   Sammanfattning : In this work, speaker characteristic modeling has been applied in the fields of automatic speech recognition (ASR) and automatic speaker verification (ASV). In ASR, a key problem is that acoustic mismatch between training and test conditions degrade classification per- formance. LÄS MER

3. 2. Automatic speaker verification on site and by telephone: methods, applications and assessment

   Författare :Håkan Melin; Björn Granström; Mats Blomberg; Josef Bigün; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; speaker recognition; speaker verification; speech technology; biometrics; access control; speech corpus; variance estimation; Information and language technology; Informations- och språkteknologi;

   Sammanfattning : Speaker verification is the biometric task of authenticating a claimed identity by means of analyzing a spoken sample of the claimant's voice. The present thesis deals with various topics related to automatic speaker verification (ASV) in the context of its commercial applications, characterized by co-operative users, user-friendly interfaces, and requirements for small amounts of enrollment and test data. LÄS MER

4. 3. Mining Speech Sounds : Machine Learning Methods for Automatic Speech Recognition and Analysis

   Författare :Giampiero Salvi; Björn Granström; Torbjørn Svendsen; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; speech; machine learning; data mining; signal processing; Computer science; Datavetenskap;

   Sammanfattning : This thesis collects studies on machine learning methods applied to speech technology and speech research problems. The six research papers included in this thesis are organised in three main areas. The first group of studies were carried out within the European project Synface. LÄS MER

5. 4. Expressiveness in virtual talking faces

   Författare :Gunilla Svanfeldt; Björn Granström; Francisco Lacerda; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Language technology; Språkteknologi;

   Sammanfattning : In this thesis, different aspects concerning how to make synthetic talking faces more expressive have been studied. How can we collect data for the studies, how is the lip articulation affected by expressive speech, can the recorded data be used interchangeably in different face models, can we use eye movements in the agent for communicative purposes? The work of this thesis includes studies of these questions and also an experiment using a talking head as a complement to a targeted audio device, in order to increase the intelligibility of the speech. LÄS MER

7. 5. The Virtual Language Teacher : Models and applications for language learning using embodied conversational agents

   Författare :Preben Wik; Björn Granström; Olov Engwall; Valerie Hazan; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Language learning; embodied conversational agents; speech technology; computer assisted language learning; computer assisted pronunciation training; Information technology; Informationsteknik; SRA - ICT; SRA - Informations- och kommunikationsteknik;

   Sammanfattning : This thesis presents a framework for computer assisted language learning using a virtual language teacher. It is an attempt at creating, not only a new type of language learning software, but also a server-based application that collects large amounts of speech material for future research purposes. LÄS MER