I posted this on matlab central but didn't get any responses so I figured I'd repost here. I recently wrote a simple routine in Matlab that uses an FFT in a for-loop; the FFT dominates the calcul...

I have an AudioRecord thread that writes to database. Now I want to use some audio data in buffer at some intervals and process it using FFT. I want to send audio buffer to FFT as parameter. When...

My project uses Visual Studio 2012, and I am using the libfftw-3.3.lib as coming from their page. When I build my project in debug, it links and compiles just fine, and I get a working application...

For a project I need to be able to generate a spectrogram from a .WAV file. I've read the following should be done: Get N (transform size) samples Apply a window function Do a Fast Fourier Transf...

Ceeloss-MacBook-Pro:desktop ceelos$ gcc -o prog -I/usr/local/include test.c Undefined symbols for architecture x86_64: "_fftw_destroy_plan", referenced from: _main in test-IBqBdS.o "_fftw_execut...

I am trying to perform several FFT's in parallel. I am using FFTW and OpenMP. Each FFT is different, so I'm not relying on FFTW's build-in multithreading (which I know uses OpenMP). int m; // as...

I am trying to install the fftw3 package through R console >install.packages("fftw") After this command it is asking to select the cran mirror.I have selected the cran mirror then following e...

The FFTW manual says that its fftw_complex type is bit compatible to std::complex<double> class in STL. But that doesn't work for me: #include <complex> #include <fftw3.h> int ma...

as a software engineer I am facing with some difficulties while working on a signal processing problem. I don't have much experience in this area. What I try to do is to sample the environmental s...

I am trying to use FFTW for image convolution. At first just to test if the system is working properly, I performed the fft, then the inverse fft, and could get the exact same image returned. T...

A similar version of this question has been asked before (how to compile fftw3 on iOS) about previous versions of IOS and/or OSX, but I am unable to get fftw3 working on a actual IOS device. (Thoug...

I'm trying to develop a simple C application that can give a value from 0-100 at a certain frequency range at a given timestamp in a WAV-file. Example: I have frequency range of 44.1kHz (typical M...

I am currently writing a genre classification application as my final year project in Computer Engineering. I initially wrote the feature extraction code (implementing FFTW) in C and now I need to ...

I wrote two identical programs in Linux and Windows using the fftw libraries (fftw3.a, fftw3.lib), and compute the duration of the fftwf_execute(m_wfpFFTplan) statement (16-fft). For 10000 runs: ...

I'm seeking a minimal Java wrapper for a recent version of FFTW. The wrappers listed on the FFTW website are either out of date (jfftw-1.2.zip) or contain too much extra stuff (Shared Scientific To...

Nowdays I just want to use FFTW3 on iOS, since I've compiled it successfully into i386 version which is used by the iOS simulator, the rest work is to compile it into armv6(or v7) version and lipo ...

I wrote a simple test program, where I was doing Complex to Complex FT's and I just generated some data 1..50 and stuck it in for the real and imaginary part for each index of the array. When I do...

I have a 2D array of data stored in column-major (Fortran-style) format, and I'd like to take the FFT of each row. I would like to avoid transposing the array (it is not square). For example, my ar...

In the char I have posted below, I am comparing the results from an IFFT run in FFTW and CUFFT. What are the possible reasons this is coming out different? Is it really THAT much round off error? ...

Using FFTW I have been computing the FFT of normalized .wav file data. I am a bit confused as to how I should normalise the FFT output, however. I have been using the method which seemed obvious to...

After doing FFT and IFFT I can hear only noise in my headphones... Here is the code: double* spectrum = new double[n]; fftw_plan plan; plan = fftw_plan_r2r_1d(n, data, spectrum, FFTW_REDFT10,...

I'm trying to do some filtering with FFT. I'm using r2r_1d plan and I have no idea how to do the inverse transform... void PerformFiltering(double* data, int n) { /* FFT */ double* spectrum = ...

I'm not a DSP expert, but I understand that there are two ways that I can apply a discrete time-domain filter to a discrete time-domain waveform. The first is to convolve them in the time domain, a...

I want to make a program that would record audio data using PortAudio (I have this part done) and then display the frequency information of that recorded audio (for now, I'd like to display the ave...

Let us say that I have a WAV file. In this file, is a series of sine tones at precise 1 second intervals. I want to use the FFTW library to extract these tones in sequence. Is this particularly har...