VOL. 10, NO. 16, SEPTEMBER 2015 ISSN 1819-6608 ARPN Journal of Engineering and Applied Sciences © 2006-2015 Asian Research Publishing Network (ARPN). All rights reserved. www.arpnjournals.com 6859 PULSE FREQUENCY SPECTRUM OF SUBJECTS WHOSE NORMAL ELECTROCARDIOGRAM (ECG) TEST Erni Yudaningtyas, Waru Djuriatno and Rudy Yuwono Department of Electrical Engineering, University of Brawijaya MT. Haryono, Malang, East Java, Indonesia E-Mail: erni@ub.ac.id ABSTRACT Pulse wave is a time domain periodic wave which the pattern is described qualitatively. Transformations is required to get the pulse wave measured quantitatively. It can be realized by using Fast Fourier Transform (FFT). That is a numerical computational method based on Fourier transform which transform the time domain periodic wave into frequency domain. Recording the pulse wave in the time domain is done on the subject of studies in which the results of the electrocardiograph (ECG) recording showed a normal heart function. Pulse wave is obtained by pressing the blood vessels using pressure sensors in the radial artery area. Pulse wave patterns in the radial artery area have a systolic time about 0.16 seconds. The special characteristic pattern of pulse wave can only be known quantitatively if the pulse wave pattern is consistent. Frequency spectrum and its constituent frequency spectrum amplitude pulse waves were obtained using the FFT method. Through this method, special characteristic of the pulse wave frequency spectrum from the subject of study was known between (1.5 to 2.1) Hz. This method is more informative because it can show special characteristics quantitatively rather than the pattern of the pulse wave in the time domain. Keyword: pulse wave, the radial artery, Fast Fourier Transform (FFT), frequency spectrum. INTRODUCTION Pulse examinations in humans include frequency, rhythm, pulse amplitude, and the condition of the wall blood vessels [1]. Pulsesin western medicine reflects the cardiovascular system; certain diseases affect the change of pulse characteristics [2]. Pulse palpation method is one of the most important diagnostic tools. Records of the radial artery pulse in normal subjects can be seen in Figure-1. Figure-1. Radial artery pulse in normal subject. Nowadays, the development of engineering field is growing rapidly, especially in the field of electrical engineering and signal processing. With the removal of noise interference and developments in the medical world, sensors, pattern recognition, signal processing, and database make the pulse recording tool can be realized [3]. The specific characteristic of pulse wave is very important in pulse diagnosis research. The special characteristic pulse wave based on the characteristics of the time domain can be used to determine specific characteristics pulse wave accurately [4]. However, those special features have not shown the quantitative results. Pulse wave is a time domain periodic wave whosepattern is described qualitatively. Transformations are required to get the pulse wave measured quantitatively. It can be realized by using the Fast Fourier Transform (FFT). This method is a numerical computational method based on Fourier transform which transforms time domain periodic wave form into the frequency domain. FFT results will show the frequency spectrum and its constituent frequency spectrum amplitude pulse wave. We proposedpulse wave subjects whose normalECG recording in time domain which reflect normal cardiac function. Furthermore, the frequency spectrums are searched by using FFT method. This method will showed the pulse wave characteristic in frequency spectrum. METHODS This research consists of two (2) phases Figure-2. 1. Phase I (observation phase) is pulse wave recording of the subject of research. Population targets were patients of type 2 diabetes who do not have impaired renal function with normal electrocardiograph recording results. Objects which are observed in this phase research are the pulse wave patterns of recording results in radial artery area in the time domain. Pulse wave patterns are focused in systolic