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11 Threads found on Dft Calculation
Please find my attempt to manually calculate the dft of the Hann function. I have built a model in MATLAB - Simulink in order to verify the results and included them in the attachment. As you can see the is a substantial difference ? Apparently the amplitude at zero frequency/dc should be 1v, 1w, 0dB or 30dBw. I cannot understand this as t
Hi to all, I'm trying to built simple power amplifier with cmos output. I need to calculate output power in tran analysis, usually I do it with dft function and rms value for signal. For example for sinus we know: P=\frac{V^2 }{2R } Also, from wiki crest factor for rectangular
I am trying to understand how the Goertzel algorithm works, which is bothering my mind at the moment. I have an discrete sampled output, but can't se how come dft calculation comes, and how come we end up spectral coefficient... Basically, I am lost..
Hello all, I am not able to get the correct amplitude of input signal from dft. My sampling frequency is 128Hz and I am take 128 Samples and computing 128-point FFT. I also have a simulated sine wave generator which I am using as input. When I vary the input frequency, FFT detects the frequency correctly till 64Hz (i.e. Fs/2) but it g
dtft -- given all points, determine a spectrum. dft -- given a set of points, determine the same number of points from the spectrum. fft -- same. the fft is just any fast calculation method. FFT is often used interchangeably with "dft" as a term. There are two immediate implications above. The first is that the dft/FFT (...)
Hi all, I am trying to do post place and route simulation using Modelsim XE with ISE 11. My code is a Discrete fourier transform implementation which contains three 1024 bytes dual port memories, and other logic for calculation of dft. When I run a post route simulation it takes 1 hour to simulate few hundreds of nano seconds, why is it happen
What device are you talking about? Amplifier, ADC, DAC... in general, you just divide the output by the full-scale (normalize to the full-scale) before taking the dft so that it corresponds to /=1->0dBFS
Though the FFT calculation is discrete, tools can automatically plot by connecting the top with a smooth curve of the magnitude plot against frequency. So it depends sometimes on the tools setting. To say SIMPLY FFT or dft is a sampled version of continusous spectrum. So I dont think the author faked or something like that. I hope I answered your q
The only transform which we may calculate using our PC or any other machine isdft All the other transforms are theoretical Because the Limits are from -Inf to +Inf Where as the limits in dft are real Numbers so we calculate only dft, Practically. FFT is nothing but a Optimized technique for calculation of (...)
Categorize your size into Random Logic Area + MEM Area. You can get the area report from synthesis tool, usually it's based on um^2. (Based on the library you are targeting). The chip area will be (RLA/cell utilization + MEM Area) * (1+dft overhead)
Hi all, Can anyone help me comment on the below code and explain how the function works.I am not sure how this function works and why is there a mid value in the calculation? Thanks a lot! regards