The peculiarities of the tuning and acoustical characteristics of Russian bells were investigated by various scientists for a long time. The results were reviewed in our previous report (pr.5117- 108 Convention AES) .In this paper the results of a new research are represented, including: digital recording of sounding of 16-20-th century bells made in various monasteries and temples of Russia; the computer processing and restoration of obtained recordings; the spectral and statistical analysis of soundings and comparison of bells tuning with that of a conventional Dutch system; development of mathematical models of bells vibration ; creation of the software for the analysis spectral frequencies and modes of vibration; synthesis of their geometric form to optimize the structure of spectrum.
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