Problem statement: The fundamental frequency (F0) of the human speech corresponds to the vibration frequency of the human vocal chords. To extract the F0 from a speech utterance, one approach is based on the Cepstral analysis. In Thai, there are four main dialects spoken by Thai people residing in four core region including central, north, northeast and south regions. Environmental noises are a...

In this paper, a buck half-bridge DC-DC converter is used as a single-stage power factor correction (PFC) converter for feeding a voltage source inverter (VSI) based permanent magnet brushless DC motor (PMBLDCM) drive. The front end of this PFC converter is a diode bridge rectifier (DBR) fed from single-phase AC mains. The PMBLDCM is used to drive a compressor load of an air conditioner through...

The increase of condenser temperature and pressure in air-conditioning leads to decreased cooling capacity the power consumption. Evaporative could improve thermal performance system. In this study, evaporative module was installed before reduce inlet air unit. impact on conditioning system's overall determined by varying pad discharge water flowrate 880, 1040, 1200 mL/min. load 2000 W employed...

The results of an analytical-experimental study related to the actual task substantiating comprehensive measures for occupational safety miners in deep coal mines on factors mine air quality based hydrodynamic conditioning processes, which is especially important development autonomous and energy-saving means ensuring miners' standards, are presented. Purpose. goal substantiate analytically mai...