Introduction. Amidst the multiplicity of audio signal processing tasks connected with the necessity of source separation, the problem of obtaining of its most prominent components occupies special place. One of the approaches, dedicated to solve such task, is based on melody extraction from musical audio recording. If generalized, such technique can be applied to a wider class of audio signals for extraction from them of the so-called fundamental frequencies contour. For its realization, an attempt was made to combine the method of median filtering with the salience estimation method, for their application at various stages of the analysis of the input audio signal. A combination of methods is used to obtain the f_0-representation of the melody, based on the processing of the filtered values obtained at the first step. The purpose of the article is to obtain the trajectory of f_0-values of the input audio signal and filtering of the corresponding to this trajectory harmonics. Results. The proposed method is effective for use in audio signal processing systems for fundamental frequencies contour of the most prominent tonal components extraction and its further reuse. Conclusions. Realized spectrum decomposition technique, based on the tendency of the time-frequency distribution of its constituent sounds, allows to effectively extract melodic contours from non-melodic contours. Nevertheless, there is a necessity for further research regarding the distribution model of harmonic and percussive characteristics relative to each other. Such a model should be extended with heuristics for more accurate filtering of stable in time tonal components of complex audio signals.

Introduction. Modern researches at the domain of radiotechnical devices and parts are showing that mean time between failures often is omitting during the brand new device designing process. Purpose of the development is to improve the method of the reliability values evaluation of the objects with variable structure including the different sets of elements working time at all possible usage modes as intended. The set-theoretic models of objects that are allowed to estimate power of element subsets quantitatively used in different modes of operation for the purpose of evaluation the reliability indicators of radio-electronic means depending on the structure of the object and the order of changing modes of operation. With the help of the mathematical apparatus of set theory, it has been proven that the reliability of radio-electronic devices will be maximum at the minimum power of the elements used during operation and vice versa. Methods. Evaluation method is needed to take into account vast majority of the minor aspects that were not included before during the calculation procedures: multi-mode work, multi-functioning, excess availability that leads to the object structure changing during its usage for purpose. Results. Taking the fifth-generation station for the experiment, several detail sets were chosen for installation into the device. Competence of the repair service, quality of the details, work-mode was taken into account for the certain result calculation achieving. Conclusion. Brand new, detailed method has been developed for the effectiveness of the objects with variable structure evaluation. Multimode availability could be a significant reliability improving feature at the devices with such structure. Also, evaluation of some separate parts of the device structure would be much more useful for the working period prolongation than evaluation of the device as a whole.