i-vector的工具箱

MSR Identity Toolbox: A Matlab Toolbox for Speaker Recognition Research Version 1.0 Seyed Omid Sadjadi, Malcolm Slaney, and Larry Heck Microsoft Research, Conversational Systems Research Center (CSRC) s.omid.sadjadi@gmail.com, {mslaney,larry.heck}@microsoft.com This report serves as a user manual for the tools available in the Microsoft Research (MSR) Identity Toolbox. This toolbox contains a collection of Matlab tools and routines that can be used for research and development in speaker recognition. It provides researchers with a test bed for developing new front-end and back-end techniques, allowing replicable evaluation of new advancements. It will also help newcomers in the field by lowering the “barrier to entry”, enabling them to quickly build baseline systems for their experiments. Although the focus of this toolbox is on speaker recognition, it can also be used for other speech related applications such as language, dialect and accent identification. In recent years, the design of robust and effective speaker recognition algorithms has attracted significant research effort from academic and commercial institutions. Speaker recognition has evolved substantially over the past 40 years; from discrete vector quantization (VQ) based systems to adapted Gaussian mixture model (GMM) solutions, and more recently to factor analysis based Eigenvoice (i-vector) frameworks. The Identity Toolbox provides tools that implement both the conventional GMM-UBM and state-of-the-art i-vector based speaker recognition strategies. A speaker recognition system includes two primary components: a front-end and a back-end. The front-end transforms acoustic waveforms into more compact and less redundant representations called acoustic features. Cepstral features are most often used for speaker recognition. It is practical to only retain the high signal-to-noise ratio (SNR) regions of the waveform, therefore there is also a need for a speech activity detector (SAD) in the fr

function Fea = cmvn（fea varnorm）
% performs cepstral mean and variance normalization
%
% Inputs:
%   - fea     : input ndim x nobs feature matrix where nobs is the 
%				number of frames and ndim is the feature dimension
%   - varnorm : binary switch （false|true） if true variance is normalized 
%               as well
% Outputs:
%   - Fea     : output p x n normalized feature matrix.
%
% Omid Sadjadi 
% Microsoft Research Conversational Systems Research Center

if （ nargin == 1 ） varnorm = false; end 
    
mu = mean（fea 2）;
if varnorm
    stdev = std（fea [] 2）;
else
    stdev = 1;
end

Fea = bsxfun（@minus fea mu）;
Fea = bsxfun（@rdivide Fea stdev）;

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2014-05-09 20:35  MSR Identity Toolkit v1.0\code\
     文件         720  2013-10-15 15:39  MSR Identity Toolkit v1.0\code\cmvn.m
     文件        2963  2013-10-15 15:39  MSR Identity Toolkit v1.0\code\compute_bw_stats.m
     文件        3030  2013-10-15 15:39  MSR Identity Toolkit v1.0\code\compute_eer.m
     文件        3260  2013-10-15 15:39  MSR Identity Toolkit v1.0\code\demo_gmm_ubm.m
     文件        4339  2013-10-15 15:39  MSR Identity Toolkit v1.0\code\demo_gmm_ubm_artificial.m
     文件        5370  2013-10-15 15:40  MSR Identity Toolkit v1.0\code\demo_ivector_plda.m
     文件        5812  2013-10-15 15:40  MSR Identity Toolkit v1.0\code\demo_ivector_plda_artificial.m
     文件        2421  2013-08-16 17:40  MSR Identity Toolkit v1.0\code\extract_ivector.m
     文件        1557  2013-10-15 15:40  MSR Identity Toolkit v1.0\code\fea_warping.m
     文件        6148  2013-10-15 15:40  MSR Identity Toolkit v1.0\code\gmm_em.m
     文件        5108  2013-10-15 15:40  MSR Identity Toolkit v1.0\code\gplda_em.m
     文件         223  2013-10-15 15:40  MSR Identity Toolkit v1.0\code\hamming.m
     文件         603  2013-10-15 15:40  MSR Identity Toolkit v1.0\code\htkread.m
     文件         534  2013-10-15 15:41  MSR Identity Toolkit v1.0\code\htkwrite.m
     文件        2068  2013-10-15 15:41  MSR Identity Toolkit v1.0\code\lda.m
     文件         428  2013-10-15 15:41  MSR Identity Toolkit v1.0\code\length_norm.m
     文件        4930  2013-10-15 15:41  MSR Identity Toolkit v1.0\code\mapAdapt.m
     文件         498  2013-10-15 15:41  MSR Identity Toolkit v1.0\code\rm_dc_n_dither.m
     文件        2567  2013-10-15 15:41  MSR Identity Toolkit v1.0\code\score_gmm_trials.m
     文件        2118  2013-10-15 15:41  MSR Identity Toolkit v1.0\code\score_gplda_trials.m
     文件        5639  2013-10-15 15:41  MSR Identity Toolkit v1.0\code\train_tv_space.m
     文件        1856  2013-10-15 15:41  MSR Identity Toolkit v1.0\code\wcmvn.m
     目录           0  2014-05-09 20:35  MSR Identity Toolkit v1.0\doc\
     文件         162  2013-08-28 03:13  MSR Identity Toolkit v1.0\doc\~$entity Toolbox-rev5.docx
     文件         162  2013-10-07 09:14  MSR Identity Toolkit v1.0\doc\~$entity Toolbox-rev6.docx
     文件     1082656  2013-10-11 10:39  MSR Identity Toolkit v1.0\doc\MSR Identity Toolbox.docx
     文件     1276208  2013-10-15 15:45  MSR Identity Toolkit v1.0\doc\MSR Identity Toolbox.pdf
     文件       24404  2013-10-15 15:35  MSR Identity Toolkit v1.0\MSR-LA No distrib-OK to modify.docx
     文件      159491  2013-10-15 15:36  MSR Identity Toolkit v1.0\MSR-LA No distrib-OK to modify.pdf
     文件        5808  2013-10-15 15:36  MSR Identity Toolkit v1.0\MSR-LA No distrib-OK to modify.txt
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