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Questions tagged [frequency-analysis]

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Getting frequency and amplitude from an audio file using FFT - so close but missing some vital insights, eli5?

tl/dr: I've got two audio recordings of the same song without timestamps, and I'd like to align them. I believe FFT is the way to go, but while I've got a long way, it feels like I'm right on the edge of understanding enough to make it work, and…
Benjamin H
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How to create an audio frequency visualizer

I have a fun artistic project in mind :) Basically, I would like to load a music file (probably as a .wav), and take it up multiple octaves so that you can represent it on the color spectrum. My question is, how do I go about breaking down an audio…
Anthony
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Fourier Transformation -

I've been doing a lot of research on this topic and I'm finally getting somewhere. Below is two complex numbers from the java code I'm using: -9771.0 - j2125.0 -16184.09634718744 - j53968.71008512241 I know the amplitude/magnitude can be computed…
user791272
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How to split image from background using frequency domain (theoretical - not code)

I would like to get ideas for how to extract the shapes from the background in this specific image using the frequency domain. I know that the solution is based on the parallel lines. Thanks! EDIT: here is the transform image FFT
user9
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Very simple explanation for using FFT to find audio frequency changes

I'm having trouble understanding the concept of using FFT to calculate frequency changes. I've been scavenging through a ton of articles on this concept but it's still confusing me. I found a Stack Overflow article about the steps to take to…
TreeHouseFalcon
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Audio processing library for C++

I'm new to signal processing .I want to analyze audio files in sports videos (Fourier transform,analyze frequencies and amplitudes etc.).I'm looking for Audio processing library for C++ like openCV for image processing.Can you please help me to…
Nicknip
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Fourier Analysis - MATLAB

Good evening guys, I wanna ask you a question regarding the analysis of a function in the domain of frequencies (Fourier). I have two vectors: one containing 7700 values for pressure, and the other one containing 7700 values (same number) for…
Firefly
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Tuple error - Frequency Analysis

In the match_letters function, with 'place = string.index(letter)' i keep recieving the same error of 'Value Error: tuple.index(x): x not a tuple.' Does anyone know how to solve this? It will be much appreciated :) Thanks def freq_analysis(): """…
George Rees
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why are wavelet coefficients zeros after decomposition

I am learning wavelet theory for image processing. To understand the theory, I write one Matlab program to decompose one black-white image. The program is as follows Image = zeros(256, 256, 'uint8'); Image(101:200, 101:200) = 255; figure;…
Jogging Song
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Incorrect Frequency in tuner app

I am currently working on an OpenGL tuner app. I currently have the FFT plot on screen, and I would like to calculate the loudest frequency. Here is what my code looks like: MainActivity @Override protected void onCreate(Bundle…
vcapra1
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Is it possible to create an array from the frequency of chars within a string?

Essentially, I found an old piece of LINQ C# code that counted the most frequent letter in a certain string. However, I'm using frequency analysis to solve a decoded text that has been shift-ciphered so I'm wanting it to return not just the most…
samil90
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Code missing datalines as unknown instead of missing

I am trying to recode the missing frequency counts to unknown and have 0 missing and place them in the unknown category instead. My code does not produce errors but it does not recode them as unknown I tried using if/then statements to recategorize
angel
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Calculating the Letter Frequency in Python

I need to define a function that will slice a string according to a certain character, sum up those indices, divide by the number of times the character occurs in the string and then divide all that by the length of the text. Here's what I have so…
Saltharion
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Descriptive statistics in Stata - Word frequencies

I have a large data set containing as variables fileid, year and about 1000 words (each word is a separate variable). All line entries come from company reports indicating the year, an unique fileid and the respective absolute frequency for each…
Dominik Scheld
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How to count frequency of multiple combination of value in Python

I'm new here and a newbie in Python. I'd like to ask a question about calculating frequency for multiple combination of variables in Python. I have a list of a lists that looks like this for example: [[A,A,A],[A,B,C],[A,A,A],[A,B,B],[A,B,C]] And I…
user3268302
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