scholarly journals PENGENALAN POLA SUARA MANUSIA BEREKSTENSI FILE WAV MENGGUNAKAN METODE FAST FOURIER TRANSFORM DAN BAYES

2018 ◽  
Vol 2 (1) ◽  
pp. 1 ◽  
Author(s):  
Nurlia Apriani ◽  
Rita Wiryasaputra ◽  
Lastri Widya Astuti
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Test Data ◽  
Sound Wave ◽  
Sound Level ◽  
Sound Waves ◽  
Bayes Method ◽  
Transform Method ◽  
Human Voice ◽  
Accuracy Result

The human voice is a very unique sound wave. That's because every human being has a different kind of sound wave. The fundamental difference in human voice is high the low the sound level associated with the signal from sound waves. The purpose of this research is to know the accuracy result from Fast Fourier Transform and Bayes method in pattern recognition. The Fast Fourier Transform method is used for feature extraction and Bayes method is used to calculate the sound probability value between the train data and test data, then Bayes Method is used to determine the result of the introduction of some previously stored train data. This research was made using Matlab R2016a, by matching the pattern of human sound that has been made before or called train data with new sound pattern or called test data. Testing is done on voice in the database and the voice is not in the database. Test results for voice in the database were 96% for first men and 76% for first women. While testing for voice is not in the database is 46% for second men and 50% for second women

scholarly journals IDENTIFIKASI ASPEK GELOMBANG BUNYI KELUARAN ALAT MUSIK SASANDO TRADISIONAL DAN SASANDO ELEKTRIK

2020 ◽  
Vol 5 (2) ◽  
pp. 100-107
Author(s):  
Martince Aryani Jusuf Kaba ◽  
Ali Warsito ◽  
Laura A.S Lapono
Keyword(s):  
Fourier Transform ◽  
Data Processing ◽  
Fast Fourier Transform ◽  
Sound Wave ◽  
Musical Instruments ◽  
Original Sample ◽  
Intensity Noise ◽  
Sound Waves ◽  
The Subject ◽  
Frequency Intensity

ABSTRAK Telah dilakukan penelitian tentang identifikasi aspek gelombang bunyi alat musik sasando tradisional dan sasando elektrik. Subjek penelitian ini adalah bunyi alat musik sasando tradisional dan sasando elektrik yang bertipe sasando biola dengan jumlah dawai 32. Bunyi alat musik sasando direkam dengan mikrofon Havit Straight M-80 dan dianalisis menggunakan perangkat lunak Wavepad sound editor. Aspek gelombang bunyi ditentukan dengan menggunakan metode Fast Fourier Transform (FFT). Sampel original bunyi sasando tradisional dan sasando elektrik dengan rentang frekuensi dari 86 Hz sampai 1206 Hz dan 97 Hz sampai 1077 Hz. Rentang intensitas dari sasando tradisional dan sasando elektrik secara berturut-turut (-45,95398906) dB sampai (-12,38564365) dB dan (-33,44661942) dB sampai (-9,780729931) dB. Kemudian dengan perangkat lunak excel diperoleh grafik data bunyi sasando tradisional dan sasando elektrik berupa grafik intensitas, frekuensi dan noise. Setelah dilakukan filter terhadap sampel original bunyi sasando tradisional dan sasando elektrik, yang mempengaruhi kualitas gelombang bunyi adalah adalah rentang noise pada sampel bunyi  dari pengolahan data -2 dB sampai 0 dB dan -4,22  dB sampai -0,14 dB dengan persentase noise 0 % sampai 8,27 % dan 0,57 % sampai 22,76 %. Sebagian besar persentasi noise berpengaruh pada bunyi asli.   Kata Kunci: Sasando, sampel original, mikrofon Havit Straight M-80, Wavepad sound editor, metode Fast Fourier Transform (FFT), frekuensi, intensitas, noise.   ABSTRACT Research has been conducted on the identification of aspects of the sound waves of traditional Sasando musical instruments and Sasando electric. The subject of this research is the sound of traditional Sasando musical instruments and Sasando electric type of Sasando violin with 32 strings. The sounds of Sasando musical instruments were recorded with the Havit Straight M-80 microphone and analyzed using Wavepad sound editor software. Sound wave aspects are determined using the Fast Fourier Transform (FFT) method. Original samples of traditional Sasando sound and Sasando electric range in frequency from 86 Hz to 1206 Hz and 97 Hz to 1077 Hz. The intensity ranges from traditional Sasando and Sasando electric are (-45,95398906) dB to (-12,38564365) dB and (-33,44661942) dB to (-9,780729931) dB. Then with Excel software obtained data graphs of traditional Sasando sound and Sasando electric in the form of graphs of intensity, frequency and noise. After filtering the original samples of traditional Sasando sound and Sasando electric, what affects the sound wave quality is the range of noise in the sound sample from data processing of -2 dB to 0 dB and -4.22 dB to -0.14 dB with a percentage of noise 0 % to 8.27% and 0.57% to 22.76%. Most of the noise percentage affects the original sound. Keywords: Sasando, original sample, Havit Straight M-80 microphone, Wavepad sound editor, Fast Fourier Transform (FFT) method, frequency, intensity, noise.

Discussion of Short-Wavelength Laser Beam Focus Using Fast Fourier Transform Method

2011 ◽  
Vol 31 (5) ◽  
pp. 0507001
Author(s):  
杨美霞 Yang Meixia ◽  
钟鸣 Zhong Ming ◽  
任钢 Ren Gang ◽  
何衡湘 He Hengxiang ◽  
刘文兵 Liu Wenbing ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Laser Beam ◽  
Fast Fourier Transform ◽  
Short Wavelength ◽  
Transform Method ◽  
Fourier Transform Method ◽  
Fast Fourier Transform Method

Impact tensile behavior analysis of Twaron fiber tows from fast Fourier transform

2018 ◽  
Vol 89 (8) ◽  
pp. 1363-1370
Author(s):  
Lvtao Zhu ◽  
Guocheng Zhu ◽  
Jianyong Feng ◽  
Limin Jin ◽  
Pibo Ma
Keyword(s):  
Fourier Transform ◽  
Strain Rate ◽  
Fast Fourier Transform ◽  
Failure Strain ◽  
Amplitude Spectrum ◽  
Strain Rates ◽  
Transform Method ◽  
Fast Fourier Transform Method ◽  
Split Hopkinson ◽  
Specific Frequency

In this study, tensile experiments of Twaron fiber tows under different strain rates (quasi-static: 0.001 s−1, dynamic: 800–2400 s−1) were tested with an MTS materials tester (MTS 810.23) and a split Hopkinson tension bar, respectively. The results showed that the mechanical properties of the Twaron fiber tows were sensitive to strain rate: the stiffness and failure stress of the fiber tows increased distinctly as the strain rate increased, while the failure strain decreased. From scanning electron microscope photographs of the fracture surface, it is evident that the Twaron fiber tows failed in a tougher mode and the axial split became more severe as the strain rate increased. The tensile behaviors of the Twaron fiber tows were analyzed in the frequency domain using the fast Fourier transform method. The amplitude spectrum and power of energy absorption of the Twaron tows were concentrated in a specific frequency range and increased with strain rate.

Acoustic Analysis of Cylindrical, Conical and Worm Gears

2019 ◽  
Vol 957 ◽  
pp. 211-220
Author(s):  
Cornel Cristian Enciu ◽  
Cristian Tarba ◽  
Cristian Barbulescu
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Real Time ◽  
Acoustic Analysis ◽  
Single Channel ◽  
Intensity Level ◽  
Analog Filter ◽  
Transform Method ◽  
Worm Gears ◽  
Electric Drill

The paper aims to determine the characteristic frequencies of an electric drill, by measuring and analyzing comparatively the variations of the acoustic intensity level, using the Fast Fourier Transform method (FFT). This was applied using a stand which had been specifically developed for the presented work. In two channel and multichannel systems, digital methods have been used for the calculation of cross properties as they were the only practical methods. Using digital techniques has gained considerable ground, being nowadays applied to problems once solved by resorting to analog methods. The increasing use of Fast Fourier Transform methods is found in single channel real time narrow band measurements and the Digital Filtering is replacing the Analog Filter bank which was used as the basis for real time analyzers operating with constant percentage bandwidth.

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