Sökning: "Speaker verification"

Hittade 5 avhandlingar innehållade orden Speaker verification.

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

    Detta är en avhandling från Stockholm : KTH

    Författare :Håkan Melin; KTH.; [2006]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; speaker recognition; speaker verification; speech technology; biometrics; access control; speech corpus; variance estimation; SOCIAL SCIENCES Statistics; computer and systems science Informatics; computer and systems science Information and language technology; SAMHÄLLSVETENSKAP Statistik; data- och systemvetenskap Informatik; data- och systemvetenskap 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

  2. 2. Lip-motion and speech biometrics in person recognition

    Detta är en avhandling från Göteborg : Department of Signals and Systems, Chalmers University of Technology

    Författare :Maycel Isaac Faraj; Högskolan i Halmstad.; [2006]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TECHNOLOGY Information technology Image analysis; TEKNIKVETENSKAP Informationsteknik Bildanalys; Audio-visual recognition; biometrics; Biometric recognition; Speaker verification; Speaker authentication; Person identification; Lip movements; Motion; Structure tensor; Orientation; Optical flow; Hidden Markov Model; Gaussian Markov Model; Lip-motion;

    Sammanfattning : Biometric identification techniques are frequently used to improve security, e.g. in financial transactions, computer networks and secure critical locations. The purpose of biometric authentication systems is to verify an individual by her biological characteristics including those generating characterisitic behaviour. LÄS MER

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

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Daniel Elenius; KTH.; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; MAP; MLLR; VTLN; speaker characteristics; dynamic modeling; child; SOCIAL SCIENCES Statistics; computer and systems science Informatics; computer and systems science Information and language technology; SAMHÄLLSVETENSKAP Statistik; data- och systemvetenskap Informatik; data- och systemvetenskap 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

  4. 4. Discrete Stochastic Time-Frequency Analysis and Cepstrum Estimation

    Detta är en avhandling från Lund University

    Författare :Johan Sandberg; Lunds universitet.; Lund University.; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ambiguity domain; time-frequency analysis; time-frequency representations; covariance function; non-stationary random processes; Speaker recognition; MFCC; cepstrum;

    Sammanfattning : Popular Abstract in Swedish Det är ofta fördelaktigt att i olika sammanhang representera våra observationer av verkligheten med en följd av tal. Så skilda exempel som ljud, bilder, hjärnvågor, havsvattenvågor, jordbävningar och aktiekurser kan låta sig beskrivas av följder av tal. LÄS MER

  5. 5. Lip-motion biometrics for audio-visual identity recognition

    Detta är en avhandling från Göteborg : Chalmers university of technology

    Författare :Maycel Isaac Faraj; Högskolan i Halmstad.; [2008]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TECHNOLOGY Information technology Image analysis; TEKNIKVETENSKAP Informationsteknik Bildanalys; Biometrics; Lip motion; Audio-visual signals; Speech recognition; Speaker recognition; Digit recognition;

    Sammanfattning : Biometric recognition systems have been established as powerful security tools to prevent unknown users from entering high risk systems and areas. They are increasingly being utilized in surveillance and access management (city centers, banks, etc.) by using individuals' physical or biological characteristics. LÄS MER