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Full-Text Articles in Engineering
Signal Processing Strategies That Improve Performance And Understanding Of The Quantitative Ultrasound Spectral Fit Algorithm, Timothy A. Bigelow, William D. O'Brien
Signal Processing Strategies That Improve Performance And Understanding Of The Quantitative Ultrasound Spectral Fit Algorithm, Timothy A. Bigelow, William D. O'Brien
Timothy A. Bigelow
Quantifying the size of the tissue microstructure using the backscattered power spectrum has had limited success due to frequency-dependent attenuation along the propagation path, thus masking the frequency dependence of the scatterer size. Previously, the SPECTRAL FIT algorithm was developed to solve for total attenuation and scatterer size simultaneously [Bigelow et al., J. Acoust. Soc. Am. 117, 1431-1439 (2005)]. Herein, the outcomes from signal processing strategies on the SPECTRAL FIT algorithm are investigated. The signal processing methods can be grouped into two categories, viz., methods that improve the performance of the algorithm and methods that provide insight. The methods that …
Digital Calculation Of Frequency Of Periodical Signal (Sinusoidal And Triangular, Tarak Benslimane, Boukhemis Chetate
Digital Calculation Of Frequency Of Periodical Signal (Sinusoidal And Triangular, Tarak Benslimane, Boukhemis Chetate
Boukhemis Chetate
– In This paper, a method of digital calculation of frequency of periodical signal (sinusoidal, triangular and square signals) is proposed. This method is based on calculation of time between two successive peaks of the rectified signal which constitutes it’s half period. This method allows the measurement of AC current and voltage of AC electrical network. To apply this method, it is necessary to have current and voltage sensors, analogue/ digital converter (ADC) and a processor. A software C++ based program is developed which can be implemented using appropriate processor. In the end are presented the digital simulation results.