09-02-2010, 07:48 PM
send the details of Implementation Of Zoom FFT in Ultrasonic Blood Flow Analysis
09-02-2010, 07:48 PM
send the details of Implementation Of Zoom FFT in Ultrasonic Blood Flow Analysis
11-02-2010, 02:50 PM
Implementation Of Zoom Fft
In Ultrasonic Blood Flow Analysis Analysis of the blood flow finds its importance in the diagnoses of diseases. The present techniques are not affordable by the poor people because of their high expense.Zoom-FFT technique is simple and affordable to detect the blood clots and other diseases.the method to zoom the image or the scanned data-using zoom FFT has been discussed. the algorithm to get ZOOM FFT and how it can be obtained via simulation is explained. ultrasonic blood flow analyzer using ZOOM FFT is explained as an application of this method. REAL BLOOD FLOW ANALYSIS: In an Ultrasonic blood flow analysis, a beam of ultrasonic energy is directed through a blood vessel at a shallow angle and its transit time is then measured. ultrasonic analyzers based on the Doppler principle are much more common. Need to ZOOM: Minute variations in blood flow can be seenfor example, the starting stage of blood clot. ZOOM FFT: The Zoom-FFT is a process where an input signal is mixed down to baseband and then decimated, prior to passing it into a standard FFT.the zoom-FFT uses digital down conversion techniques to localize the standard FFT to a narrow band of frequencies that are centered on a higher frequency. It is used to reduce the sample rate required when analyzing narrowband signals. Basically, this technique is an efficient computation of a subset of the FFT. the zoom process: 1)the basic architecture of the Zoom-FFT: Spectrum analyzers originally provided the zoom FFT to offer higher frequency resolution over a specific bandwidth, given the limitation of a small amount of on-board memory. very fine frequency resolution can be obtained without computing the entire spectrum by using zoomFFT. Digital zoom (frequency domain) is usually implemented by multiplying the input signal with a sine and cosine at a new desired center frequency, and then low-pass filtering the data, followed by sampling rate reduction (decimation). ADVANTAGES a)Increased frequency domain resolution b)Wider spectral range c)Reduced hardware cost and complexity report: IMPLEMENTATION-OF-ZOOM-FFT-IN-ULTRASONIC-BLOOD-FLOW-Analysis.pdf (Size: 227.45 KB / Downloads: 262)
18-04-2010, 11:10 PM
please read https://seminarproject.net/Thread-implem...w-analysis and https://seminarproject.net/Thread-implem...ysis--7188 for getting more information about Implementation Of Zoom FFT in Ultrasonic Blood Flow Analysis
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