Dynamic footprint based locomotion sway assessment in α-synucleinopathic mice using Fast Fourier Transform and Low Pass Filter

2018 ◽  
Vol 296 ◽  
pp. 1-11 ◽  
Author(s):  
Ivanna K. Timotius ◽  
Fabio Canneva ◽  
Georgia Minakaki ◽  
Cristian Pasluosta ◽  
Sandra Moceri ◽  
...  
2016 ◽  
Vol 3 (1) ◽  
pp. 18
Author(s):  
Sukma Firdaus ◽  
Marlia Adriana

Peningkatan alat trasportasi khususnya kendaraan roda empat (mobil) mengakibatkan peningkatan volume kendaraan di jalan. Hal ini berdampak pada meningkatnya kemacetan. Selain kemacetan, peningkatan volume kendaraan berdampak juga pada peningkatan kecelakan lalu lintas. Salah satu penyebab kecelakan lalu lintas adalah faktor pengendaranya, yaitu kelelahan. Penelitian ini, merancang sistem pendeteksi kelelahan pengemudi, berdasarkan sinyal biologis pengemudi yaitu sinyal biologis kondisi otot lengan. Sinyal tersebut direkam dengan menggunakan metode surface EMG. Elektroda yang ditempelkan disebelah kanan lengan dihubungkan dengan penguat instrumentasi dan digitalisasi melalui unit pemproses sinyal untuk dapat disimpan kedalam komputer. Kegiatan pengambilan data dilakukan sebanyak 8 kali dengan jarak tempuh pengemudi sebesar 80 km dari Kota Banjarmasin menuju Kota Pelaihari. Akuisisi data menggunakan frekuensi sampling sebesar 4 KHz dan diproses secara filter analog untuk High Pass Filter sebesar 2 KHz dan Low Pass Filter sebesar 500 Hz. Setelah data direkam, sinyal dilakukan proses downsampling menjadi 1 KHz. Pada proess digital, dilakukan lagi proses pemfilteran secara Low Pass Filter sebesar 500 Hz. Proses digital selanjutnya adalah melakukan analisis pada domain frekuensi menggunakan transformasi fourier dengan memakai algoritma fast fourier transform (fft). Hasil dari transformasi fourier diidentifikasi berdasarkan nilai Mean Power Frequency (MPF). Berdasarkan hasil perhitungan MPF yang telah dilakukan, diperoleh saat awal berkendara nilai rata-rata MPF nya adalah sebesar 25,2 Hz sedangkan pada akhir berkendara bernilai sebesar 33,3 Hz. Dengan hasil ini dapat tergambarkan kondisi pengemudi pada awal mengemudi dan tidak terjadi kelelahan maka nilai frekuensi yang dominan cenderung lebih rendah jika dibandingkan dengan setelah berkendara atau saat kelelahan.


For digital signal processing, communication systems and VLSI design architectures, an efficient FIR filter is required to eliminate the noise signals. To design an efficient FIR filter, the minimization of two parameters is required such as side lobe attenuation and power. These two parameters can be achieved by designing a FIR filter with the help of Fractional Fourier Transform (FrFT) and Canonical Signed digit (CSD) algorithm. In this work, Finite Impulse Response (FIR) low pass filter is designed by using both FrFT and ordinary Fourier Transform (FT) methods and their frequency responses are compared in terms of side lobe attenuation (SLA). After comparison of both methods, the better results are obtained for an FrFT based design of FIR low pass filter. Apart from this, the FrFT based design of FIR low pass filter is realized in direct form architecture and implemented in VLSI. Further, the Canonical Signed digit (CSD) algorithm is applied for the multiplication process in the architecture implementation to minimize the power consumption. Moreover, frequency response of FIR low pass filter is obtained by using MATLAB software and simulation and synthesis results are obtained by using Xilinx 13.1 ISE.


2013 ◽  
Vol 336-338 ◽  
pp. 982-987 ◽  
Author(s):  
Jian Hua Cheng ◽  
Bing Yu Wang ◽  
Dai Dai Chen

According with the problem that the error propagative characteristics of rotation inertial navigation system can not be quantitatively analyzed, a new error analyzing method is proposed. As the inertial navigation system can be equivalent to a low pass filter, the method converted the complex gyro drifts into signal which can be quantitatively analyzed after modulating through Fourier transform, thus the low frequency components of the error can be extracted. The relationship between navigation errors and gyro drifts is built by using the conventional error equations of strapdown inertial navigation system. The comparative analyses and computer simulation of conventional, uniaxial unidirectional and uniaxial reciprocating system prove the correctness and feasibility of this method. This method provides an effective reference for other same types of control system error analyses.


2004 ◽  
Vol 471-472 ◽  
pp. 654-657
Author(s):  
Yun Shan Wang ◽  
S. Fu ◽  
Jin Quan Xu ◽  
Can Lin Zhou ◽  
S.C. Si ◽  
...  

Fourier transform profilometry in 3-D measurement based on wavelet digital filter is presented in this paper. Before phase demodulation, original modulated grating image is handled with wavelet transform in order to remove the background components and high frequency. This method resolves spectrum overlapping at some extent and reduces the requirement of low-pass filter.


2014 ◽  
Vol 971-973 ◽  
pp. 1368-1371 ◽  
Author(s):  
Bo Guo ◽  
Guo Qing Hu ◽  
Guang Yong Yang

In this paper we present a global approach for the automatic inspection of spot-type defects in TFT-LCD module process. The proposed method is based on a global image reconstruction scheme using the Fourier transform. Since TFT-LCD surface has the statistical and periodic texture, the isotropic spread of frequency components in the power spectrum space forms the shape approximate to a circle. By computing the convolution between the Fourier transform result and a ideal low pass filter (ILPF) , we can remove the TFT-LCD periodic and repetitive patterns using the inverse Fourier transform. In the restored image, the global structurally textured background is eliminated and the spot-type defects are preserved. This converts the difficult defect detection in TFT-LCD images into a simple segmentation problem. The spot-type defects are classified into general point defects and spot Mura defects .The experimental results from point defects and spot Mura defects have shown the efficacy of the proposed method.


2017 ◽  
Vol E100.C (10) ◽  
pp. 858-865 ◽  
Author(s):  
Yohei MORISHITA ◽  
Koichi MIZUNO ◽  
Junji SATO ◽  
Koji TAKINAMI ◽  
Kazuaki TAKAHASHI

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