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27.475  Articles
1 of 2.749 pages  |  10  records  |  more records»
Pitch period evaluation of speech signal is used in many important applications of speech technology. However, among the existingmethods only some can work in case of non-linear and non-stationary signals. The main reason is that the pitch detection metho... see more

In this work we use discrete wavelet transform for analyzes the frequency structure of EEG signal with evoked potentials after effect of stimulus. The method for determining the response time to a stimulus, based on the evaluation of the wavelet entropy a... see more

It is intended to validate, two examples, the use of the wavelet transform to detect mechanical failures. The first, a gear with a broken tooth is subjected to a rotation testing machine, where the vibration signals are extracted by means of a network of ... see more

Kurtogram can adaptively select the resonant frequency band, and then the characteristic fault frequency can be obtained by analyzing the selected band. However, the kurtogram is easily affected by random impulses and noise. In recent years, improvements ... see more

When studying the temperature dependences of the acoustic absorption and the modulus of elasticity, absorption peaks are often observed, which correspond to the characteristic step on the temperature dependence of the modulus of elasticity. Such features ... see more

In this paper, we focus on cooperative spectrum sensing (CSS) for double threshold improved energy detector. In this method, the improved energy detector compares positive power operation p of the amplitude of received signals at each secondary user (SU) ... see more

This study tried to observe the correlation and coherency between sea surface temperature (SST) and wind velocity in the Malacca Strait at the year of 2015. The SST and wind velocity data with 6 hours interval step have been used in this study. S-Transfor... see more

The research about the characterization of neutron energy spectrum as the effect of thickness variation of beryllium (Be) target on HM-30 cyclotron using Monte Carlo N-Particle eXtended (MCNP-X) has been conducted. This research aims to know the character... see more

Having in mind the growing interest in Electro-Mechanical actuators and the need for a diagnostic tool to make them even more reliable, this paper will be focused on the creation of a method capable of detecting different failures of a Brushless DC Motor,... see more

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