Music Tune Restoration Based on a Mother Wavelet Construction

It is offered to use the mother wavelet function obtained from the local part of an analyzed music signal. Requirements for the constructed function are proposed and the implementation technique and its properties are described. The suggested approach allows construction of mother wavelet families with specified identifying properties. Consequently, this makes possible to identify the basic signal variations of complex music signals including local time-frequency characteristics of the basic one

High-purity materials Production and application

The paper gives data on the properties of a number of high-purity materials whose development was supported by the Federal Scientific and Technical Program The Advanced Materials, among them polycrystalline zinc selenide for optics with an absorption coefficient of (5-10) x 10"-"4 cm"-"3 at the wavelength of 10.6 #mu#m. Glasses for fiber light guides based on arsenic sulphide and selenide exhibit the heterophase submicron inclusion content #<=#2 x 10"4 cm"3 and the oxygen, carbon and hydrogen impurity content of 10"-"4 - 10"-"6 at%. We have prepared seven standard samples of rare-earth and high-melting metals, whose impurity contents range from 10"-"3 to 10"-"9 wt%. The promising directions in the further development of narrow-gap semiconductors and high-purity optical materials are indicated. (author)Translated from Russian (Advanced Materials '99 Conference Proceedings, Inst. of Strength of Materials, Kiev, 1999)Available from British Library Document Supply Centre-DSC:9023.190(9654)T / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo