Top "Fft" questions

Determining frequency of an array in Python

I have a sample file filled with floating point numbers as follows: -0.02 3.04 3.04 3.02 3.02 3.06 3.04 3.02 3.04 3.02 3.04 3.02 3.04 3.02 3.04 3.04 3.04 3.02 3.04 3.02 3.04 3.02 3.04 3.02 3.06 3.02 3.04 3.02 3.04 3.02 3.02 3.06 3.04 3.02 3.04 3.02 3.04 3.02 3.04 3.04 3.04 3.02 3.04 3.02 3.02 3.06 3.04 3.02 3.06 3.02 3.04 -0.02 -0.02 -0.02 -0.02 -0.02 -0.02 -0.04 …

python transform fft text-processing

Calculating frequencies from .mp3 or .wav files?

I'm trying to do some note recognition on mp3 or wav files. The problem is: How do I use the …

java audio signal-processing fft pitch-tracking

amplitude of numpy's fft results is to be multiplied by sampling period?

I try to validate my understanding of Numpy's FFT with an example: the Fourier transform of exp(-pi*t^2) should …

python numpy fft dft

How can I get DFT/FFT output frequencies in Hertz?

I want to develop musical notes detector as my degree project and I want to do it from scratch. I …

c audio fft dft

Spectrogram C++ library

For my current project in C++ / Qt I need a library (LGPL is preferred) which can calculate a spectrogram from …

c++ fft scientific-computing spectrum spectrogram

Frequency detection from a sound file

What I am trying to achieve is the following: I need the frequency values of a sound file (.wav) for …

python audio numpy fft frequency

Do I need to call fftshift before calling fft or ifft?

In the book "Computational Fourier Optics, A Matlab Tutorial" by David Voelz, it is written that a call to fftshift …

matlab fft

unit of fft(DFT) x axis

Possible Duplicate: How to get Frequency from FFT result I am somehow confused with the x axis of fft(DFT) …

matlab signal-processing fft dft

DFT matrix in python

What's the easiest way to get the DFT matrix for 2-d DFT in python? I could not find such function …

python numpy scipy fft dft

FFT bin width clarification

I'm developing a spectrum analyzer for the 8bit Atmega32 that outputs onto a LCD display. The maximum sampling frequency is 40…

c signal-processing fft avr spectrum