7,557 research outputs found
Homogenous Ensemble Phonotactic Language Recognition Based on SVM Supervector Reconstruction
Currently, acoustic spoken language recognition (SLR) and phonotactic SLR systems are widely used language recognition systems. To achieve better performance, researchers combine multiple subsystems with the results often much better than a single SLR system. Phonotactic SLR subsystems may vary in the acoustic features vectors or include multiple language-specific phone recognizers and different acoustic models. These methods achieve good performance but usually compute at high computational cost. In this paper, a new diversification for phonotactic language recognition systems is proposed using vector space models by support vector machine (SVM) supervector reconstruction (SSR). In this architecture, the subsystems share the same feature extraction, decoding, and N-gram counting preprocessing steps, but model in a different vector space by using the SSR algorithm without significant additional computation. We term this a homogeneous ensemble phonotactic language recognition (HEPLR) system. The system integrates three different SVM supervector reconstruction algorithms, including relative SVM supervector reconstruction, functional SVM supervector reconstruction, and perturbing SVM supervector reconstruction. All of the algorithms are incorporated using a linear discriminant analysis-maximum mutual information (LDA-MMI) backend for improving language recognition evaluation (LRE) accuracy. Evaluated on the National Institute of Standards and Technology (NIST) LRE 2009 task, the proposed HEPLR system achieves better performance than a baseline phone recognition-vector space modeling (PR-VSM) system with minimal extra computational cost. The performance of the HEPLR system yields 1.39%, 3.63%, and 14.79% equal error rate (EER), representing 6.06%, 10.15%, and 10.53% relative improvements over the baseline system, respectively, for the 30-, 10-, and 3-s test conditions
Singly Cabibbo suppressed decays of with SU(3) flavor symmetry
We analyze the weak processes of anti-triplet charmed baryons decaying to
octet baryons and mesons with the SU(3) flavor symmetry and topological quark
diagram scheme. We study the decay branching ratios without neglecting the
contributions from for the first time in the SU(3)
flavor symmetry approach. The fitting results for the Cabibbo allowed and
suppressed decays of are all consistent with the experimental
data. We predict all singly Cabibbo suppressed decays. In particular, we find
that , which is
slightly below the current experimental upper limit of and
can be tested by the ongoing experiment at BESIII as well as the future one at
Belle-II.Comment: 11 pages, 2 figure, revised version accepted by PL
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