Application of sound analysis in the diagnosis of heart and respiratory diseases
الموضوعات :
1 - M.sc Graduated Student, Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
الکلمات المفتاحية: Vibration, Ultrasonic wave, sound processing, Heart and respiratory system,
ملخص المقالة :
In this article, we will introduce the applications of sound processing in heart and respiratory diseases. Sound waves are longitudinal mechanical waves. This wave physics can propagate in solids, liquids and gases. The material particles that transmit this wave physics oscillate in the direction of the wave propagation. Longitudinal Biomechanical waves occur in a wide range of frequencies. And meanwhile, the physical frequencies of sound waves are in the range that can stimulate the human ear and brain to hear.This range is approximately 20 Hz to about 20,000 Hz and is called audible range. Longitudinal mechanical waves whose frequency is below of the audible range are called subsonic waves, and those whose frequency is above of this range are called ultrasonic waves.Whenever we hit an object, the layers of air move between our hand and the object, and if these movements are more than 16 times per second, a sound is created. In order to better study the role of speech organs in the production of Persian language phonemes, it first seems necessary to provide brief information on how to produce phoneme or sound.Phoneme or sound is produced by the vibration of air molecules. Vibration means the movement of air molecules from their place in a certain direction and their return to their original place. This physical phenomenon is called a wave.
