fft

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Gaussian blur and FFT

I´m trying to make开发者_Python百科 an implementation of Gaussian blur for a school project. I need to make both a CPU and a GPU implementation to compare performance.[详细]

2023-04-13 03:48 分类：问答
Discrete Fourier Transform: How to use fftshift correctly with fft

I want numerically compute the FFT on a numpy array Y. For testing, I\'m using the Gaussian function Y = exp(-x^2). The (symbolic) Fourier Transform is Y\' = constant * exp(-k^2/4).[详细]

2023-04-12 08:36 分类：问答
NAudio frequency band intensity

I have an audio player using NAudio and I would like to display a real time intensity for each frequency band.[详细]

2023-04-12 04:24 分类：问答
What are Window's FFT functions?

I\'m writing a Win32 application, using just C++ and WinApi calls. I need to run an 8192-point FFT over 20ms of WAVEFORMATEX data. What would be the most e开发者_如何学Cfficient method of accomplishin[详细]

2023-04-11 22:04 分类：问答
How to get frequency from fft result?

I have recorded an array[1024] of data from my mic on my Android phone, passed it through a1D forward DFT of the real data (setting a further 1024 bits to 0). I saved the array to a text file, and rep[详细]

2023-04-11 18:16 分类：问答
Using FFT in Android

I am having trouble understanding how I should pass PCM data from the mic to this FFT class I am using made by Piotr Wendykier (it\'s the DoubleFFT_1D class in JTransforms).[详细]

2023-04-10 09:19 分类：问答
Fourier Transform + emgucv

Can anybody tell me what is the problem in this code... Basically I am trying to compute the dft of the image and show it as an image on my screen.[详细]

2023-04-10 07:32 分类：问答
JTransforms FFT in Android from PCM data

I\'ve been playing with this now for sometime, I cant work out what I am meant to be doing here. I am reading in PCM audio data into an audioData array:[详细]

2023-04-10 07:12 分类：问答
Image Convolution in Frequency Domain (MATLAB)

I\'m writing a c++ program for a class to do convolution in the frequency domain, and I noticed the final result had error along the corner. So I tried it out in MATLAB and got the exact same results.[详细]

2023-04-10 01:15 分类：问答
Indexing arrays in matlab from 0

For the math class I\'m taking, I have to write a program to compute the FFT of a function. We have been given the code in class. I\'m having problems entering the code in matlab because the index sta[详细]

2023-04-09 21:11 分类：问答