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Questions tagged [frequency-analysis]

393 questions
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Need an audio analysis library to create real time feedback from audio file?

Real-time is not necessarily required, however I am creating a game for my final year project and I wish to use the power of audio to create dynamic levels based solely on a music track that is playing. I aim to create this game for the PS Vita…
ProperBritish
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Am I using the Fourier transformation the right way?

I am wondering if I am using Fourier Transformation in MATLAB the right way. I want to have all the average amplitudes for frequencies in a song. For testing purposes I am using a free mp3 download of Beethovens "For Elise" which I converted to a 8…
stefan.at.kotlin
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One large frequency table for multiple variables

I have a dataframe with 4 nominal variables with 3 levels each (A, B, C). I want to make a frequency table of height 4 and width 3, where each row contains the count of the levels for that variable. df <- data.frame(var1=c('B', 'A', 'C', 'A', 'B',…
Erjen
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How to extract a specific frequency range from a .wav file?

I'm really new on sound processing, so maybe my question will be trivial. What I want to do is to extract a specific frequency range (let's say 150-400 Hz) from a wav file, using R. In other words, I want to create another wave file (wave2) that…
Tommaso
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How to use cepstral?

Recently I asked this question: How to get the fundamental frequency from FFT? (you don't actually need to read it) My doubt right now it: how to use the cepstral algorithm? I just don't know how to use it because the only language that I know is…
Lucas Speranza
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How To Detect Sound Frequency on Android?

First of all, I am pretty new to Android. I was doing Arduino before this. And my first objective that I want to achieve is to be able to detect a specific sound frequency or pattern. So, before I can even detect a specific sound frequency, I have…
Syah
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Frequency shift using FFT in Matlab

I am working on implementing BFSK modulation and demodulation with frequency hopping and I need to test my results using Matlab. The output the I am getting from my BFSK program is an array of sine values corresponding to the carrier signal for…
anshu
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SQL - Determine the most frequently occuring words within a column

Is there an easy way of determining the most frequently occuring word in a column/field using T-SQL or VBA? I am working on a fuzzy matching system for two given recordsets and would like to produce a matching string where the most frequently…
user1075081
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Calculate Character Frequency in Message using Perl

I am writing a Perl Script to find out the frequency of occurrence of characters in a message. Here is the logic I am following: Read one char at a time from the message using getc() and store it into an array. Run a for loop starting from index 0…
Neon Flash
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Auriotouch, get musical note from frequency FFT

I'm developing a kind of guitar tuner. I have a function that gives me the FFT, and the values of the FFt for each frequency. How do I get the musical note from there? Do I have to chose the highest peak? for(y=0; y
Neva
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AudioKit 4.2.3 Crash Microphone Frequency Analysis Swift 4.1

I just updated to the latest AudioKit version 4.2.3 and Swift 4.1 I'm getting a crash at audiokit.start() that I can't decipher. Please lmk if you need more of the error code. AURemoteIO::IOThread (21): EXC_BAD_ACCESS (code=1,…
robinyapockets
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Summary in R for frequency tables?

I have a set of user recommandations review=matrix(c(5:1,10,2,1,1,2), nrow=5, ncol=2, dimnames=list(NULL,c("Star","Votes"))) and wanted to use summary(review) to show basic properties mean, median, quartiles and min max. But it gives back the…
Roland Kofler
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How to read real-time frequencies from a microphone input?

I want to get frequencies of a voice input acquired from microphone in real-time. I searched about this and got to know about FFT and another 2, 3 algorithms but implementing those algorithms seemed very complicated. I am looking for a C# library…
kas
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Oscillation and frequency spectrum through a Fourier transform

I'm trying to find the oscillation and spectrum frequency of the waveform generated by a vector of data representing the motion of a pixel in an image. The data is stored in a .txt file, as follows: 75.000000 60.000000 52.000000 61.000000…
Jorge Cruz
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Cryptography. English "normal text"?

I was asked to make a software that will encrypt and decrypt a "normal English" text based on letter frequencies. The question is where do I find some text samples where the official frequencies will match? So far, I have tried "War and Peace" by…
sdadffdfd
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