Central and Eastern European Survey

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Type of Organisation: public
Number of Employees: Less than 10
Activities developed: Research, Education.

Research interests: Our main interest is in speech signal analysis, synthesis and compression. First of all we are interested in CELP coders. We have developed efficient multistage algorithms for selection of the excitation signals in CELP coders and multistage vector quantizers. We are interested in the speech models applicable to the low bit rate speech coders - especially the excitation signals for LPC vocoders. We have some experience in the medium bit rate speech and audio coders using subband filtering, lapped transforms, Karhunen-Loeve transform and exploiting the masking properties of the human ear. In speech processing we are also interested in rule based text-to-speech synthesis and the application of neural network technology for speech processing: text-to-speech synthesis and recognition of isolated words. Main achievements: 1. Efficient algorithms of multistage modelling (based on QR factorization and orthogonalization of codebook vectors) for CELP coders and Product Code Vector Quantizers, 2. Fast algorithms for ternary excited CELP, 3. Real time ADPCM coders, LPC vocoders and CELP coders - implemented on the TMS320C25 and TMS320C30 DSP 4. Voice messaging systems 5. Text-to-speech synthesizer for the Polish language - implemented on the TMS320C25 DSP Education and training: We have developed 3 computer supported laboratories for students of electronics and telecommunications: the signal processing lab., the speech analysis and compression lab., and the speech synthesis and recognition lab. Computing facilities, programming languages: We use C, C++, Assembler and NDP Fortran on MS-DOS, Assembler for TMS320 signal processors, Assembler for DSP32C signal processor, C++ on Unix, Matlab, Mathematica on MS-DOS or UNIX. We have several IBM-PC compatibles connected to SUN and Hewlett-Packard workstations with X-terminal emulation capability, TMS320C25, TMS320C31 and DSP32C boards (Hypersignal Workstation included). Collaborative activities: common research with Nicolas Moreau, ENST Dep.SIGNAL, CNRS - URA 820, 46, rue Barrault, 75634 Paris Cedex 13, France, participation in the European Satellite Communications and Networking Research Project EUROSAT - 9645

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