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Questions tagged [frequency-analysis]

393 questions
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Finding the most frequent items in a dataset

I am working with a big dataset and thus I only want to use the items that are most frequent. Simple example of a dataset: 1 2 3 4 5 6 7 1 2 3 4 5 4 5 4 8 9 10 11 12 13 14 15 16 17 18 19 20 4 has 4 occurrences, 1 has 2 occurrences, 2 has…
the_sunbeam
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NAudio WAV file Frequency to Decibels

I'm using NAudio to generate a WAV file. The Wav file contains environment noise (detected and recorded via mic). I need to process this file to show average loudness (dB) against different frequency bands. I read much about 1:3 Octave band…
imran2155
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Running array through dictionary with repeated values

So, i have two files, first is a text file, and the second is a encryption of the first file: textfile: cryptool (starting example for the cryptool version family 1.x) cryptool is a comprehensive free educational program about cryptography and…
Helder Ferreira
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Android: Get more precise frequencies through fft

I'm using this FFTBasedSpectrumAnalyzer to analyze sound gathered by the mic. However, the FFTBasedSpectrumAnalyzer created a graph whereas I want a single frequency I could place in a label, so I am trying to get the frequency of the peak by this…
Jameson
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How can I plot observed and expected frequency from long series data in python

I have observed data which is given in link below: https://drive.google.com/open?id=0B2rkXkOkG7ExbFpuSlNJazJoaVE from this data I tried make plot of observed and expected frequencies by assuming the normal distribution. Can any one help me to…
bikuser
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Android record sound in real time and identify frequency

im trying to detect frequency during recording in andrid i follow those post and non of them give working code: Android app to record sound in real time and identify frequency android getting sound frequencies real…
itzhar
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Adjust frequency range - Web Audio api analyser

I have been playing around with the web audio api. I am using getByteFrequencyData to display the decibel data of frequency bands, however I would like to change the overall range in which the frequency bands are shown, as right now the important…
Slidon
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band filtering based on PSD, to filter out frequency domains in r, probably using "buttord" from signal

I'm still a novice in R and I read quite a couple of posts and discussions on how to filter out frequency domains in a time series, but none of those quite matched my problem. I would like to ask for your suggestions about the following: I…
Istvan Gabor Hatvani
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Implementing the Z-transform definition of the NDFT algorithm in Matlab

I would like to implement the following z-transform equation in MatLab to calculate the 1-D Non-Uniform Discrete Fourier Transform (NDFT): source:…
James
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How to show values repeatedly in the same textbox?

At first I should appologize if code below looks horrible and not formatted correctly. I don't know much about programming, so I took pieces of programs from different sources and just put them together. In app I'd like to display frequency (using…
AlarMa
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Calculate frequency from FFT sample?

I'm using the below code in Unreal Engine 4 to capture microphone input and get the resulting FFT. I'm having trouble calculating the frequency based on this data. I've tried finding the max amplitude and taking that as the frequency, but that…
Jiexi
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Detect frequencies in a buffer along the time

if I record a series of frequencies beeps into a buffer, for example: 15kHz for 50ms, 17k for 50 ms and goes on, is there any way to "go" along the time plain and to decode this freqs(with goertzel or something)? Hey, this is an update, I've added…
axcelenator
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Frequency analysis issues with tuple error

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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Android - demod FSK using goertzel

I am using this code https://stackoverflow.com/questions/23432398/audio-recorder-in-android-process-the-audio-bytes to capture the mic audio but I am writing the data to a ByteArrayOutputStream. After I finish the record I want to demodule the…
just_code_it
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Caesar Cipher w/Frequency Analysis how to proceed next?

I understand this has been asked before and I somewhat have a grasp on how to compare frequency tables between cipher and English(this is the language I'm assuming its in for my program) but I'm unsure about how to get this into code. void…
Kthieu
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