Issue No 3, 2003 |
SDT - SOFTWARE PACKAGE FOR CONTINUOUS SPEECH RECOGNITION
V.A. Barannikov, Alexander A. Kibkalo
VANT. Ser.: Mat. Mod. Fiz. Proc. 2003. No 3. P. 3-7.
SDT (Speech Developer Toolkit), the system for large vocabulary continuous speech recognition (LVCSR), was developed in VNIIEF- STL project. The package was used to build US English and Mandarin speech recognition systems. SDT functionality includes feature extraction, acoustic models building and adaptation, fast decoding with finite and stochastic grammar, speaker recognition, decoding results scoring. The last version of SDT includes some features to support LVCSR for the Russian language. The decoding results for Russian tasks with closed and open dictionaries are presented.
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| DEVELOPMENT OF RUSSIAN SPEECH RECOGNITION SYSTEM Alexander A. Kibkalo, M.M. Lotkov, I.G. Rogozhkin, A.A. Turovetz
VANT. Ser.: Mat. Mod. Fiz. Proc. 2003. No 3. P. 8-20.
High-quality systems of continuous speech recognition for some languages are currently available. However the progress in this field for Russian and other Slavonic languages is rather moderate. The main reasons are the lack of high-quality Russian language resources and peculiarities of Russian language (large number of wordforms and arbitrary order of words in a sentence). The paper presents the latest results of the efforts to create a continuous speech recognition system with a large vocabulary, namely, recording of Russian audio packages and construction of acoustic models for a system prototype, creation of a large Russian phonetic vocabulary and development of a Russian speech decoder model. These activities are based on the package of STD 4.0 program developed by VNIIEF-STL firm.
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| FAST CALCULATION OF ACOUSTIC PROBABILITIES IN THE SYSTEM OF SPEECH RECOGNITION A.A. Uzentsov
VANT. Ser.: Mat. Mod. Fiz. Proc. 2003. No 3. P. 21-24.
An efficient implementation of computing functions for Gauss mixtures using SIMD instructions of Pentium ®III and Pentium ®4 processors is described. The feasibility of OpenMP language for parallel computation of Gauss mixtures is studied. The use of an optimized code in the speech recognition system allowed a reduction of inputs for probabilities computation from 80 to 30-45%. Optimized functions are included in the Intel Integrated Performance Primitives library.
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| GENERAL DEVELOPMENT OF FGLIB LIBRARY FOR FORTRAN GRAPHICAL SUPPORT , A.A. Rasskazov
VANT. Ser.: Mat. Mod. Fiz. Proc. 2003. No 3. P. 25-33.
General development of FGLIB graphical support library for Fortran programmers, its architecture, purpose and functions of basic library elements are studied. The paper also states distinctions in developing library version for OS Linux compared to OS Windows. The examples of Fortran library subprograms use are offered.
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| HIGH-PERFORMANCE MULTIPLATFORM SUBSYSTEM OF DYNAMIC MEMORY CONTROL FOR SMP-MULTIPROCESSORS WITH IA32/IA64 ARCHITECTURE A.M. Lyakishev
VANT. Ser.: Mat. Mod. Fiz. Proc. 2003. No 3. P. 34-42.
The paper describes an architecture of high-performance subsystem of shared memory dynamic control, implementing the level of application interaction with operational system core for minimizing the time to allocate/release memory required for an application. The subsystem is intended to use the operational system core at the application level on single and multiprocessor systems with shared memory, based on 32/64 bit Intel processor under supervision of operational systems Windows and Linux. OpenMP technology support makes it possible to use the subsystem for increasing the performance of single and multithreaded applications actively operating with the memory. This subsystem for dynamical memory operation is implemented in the form of ANSI C-compatible library of memory allocation/release basic functions, which can be used to construct applications on Windows/Linux IA32/IA64 platforms combined with Microsoft and GNU GCC VC compilers. An adapted version of memory control subsystem is included in Intel Fortran compiler, so the Fortran applications compiled by this compiler will use the memory control subsystem resources automatically.
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| CALCULATION OF SUPERCRITICAL STAGE OF MATERIAL FAILURE AT DYNAMIC LOADING V.N. Markelov
VANT. Ser.: Mat. Mod. Fiz. Proc. 2003. No 3. P. 43-47.
A method of computing a supercritical stage of elastic plastic material failure at dynamic loading is given. The method is based on the concept of existence and development of a surface of elastic plastic material failure in a stress space for which a surface of Mises yield is treated when the material has reached ultimate (critical) strain rate. Supercritical stage of material failure is simulated by shearing (kinematical softening) and compressing (isotropic softening) of failure surface according to a linear law. Stability of computing supercritical stage of failure with a negative inclination angle of a material formation diagram is obtained by splitting failure process into two stages: a stage of strain hardening and a stage of material strainless softening at each time step. Numerical solution of the problem on crack propagation in a sample with finite-element code using this method of computation is exemplified. Computational results are compared with available experimental data.
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| RANKINE-HUGONIOT WAVES V.D. Malshakov
VANT. Ser.: Mat. Mod. Fiz. Proc. 2003. No 3. P. 48-59.
An accidentally discovered object is described. Close contact with it convinces that it is the very object which has been taken in due time for an expansion shock and replaced by an automodel Riemann construction. It is shown that this object is not shock in its usual self. So there is no any cause to break with it for reasons of entropy nondecreasing. A traditional treatment of thermodynamics principle in today's continuum mechanics is adapted artificially to substantiating physical nature of Riemann model for an expansion wave. Actually this substantiation rests on physical narrowness of differential form of gas-dynamic equations for which this wave serves as a limiting solution. The matter is that in derivation of these equations one uses implicitly the principle of long range action which appears to be decisive in settling this vexed question. The paper is debatable. It is accompanied by the opinion of the reader Yu.A. Bondarenko contrary to the author's concepts.
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