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Questions tagged [spectrogram]

A spectrogram, or sonogram, is a visual representation of the spectrum of frequencies in a sound, at each time. Spectrograms are also called spectral waterfalls, voiceprints, or voicegrams. Spectrograms are used extensively in the development of the fields of music, sonar, radar, and speech processing, seismology, etc.

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How to extract the frequencies from spectrogram?

I got some code which takes wav songs from one folder and generates the corresponding spectrograms in another folder. However, I would like to extract the frequencies sampled each song when generating the spectogram, to eventually plot a histogram…
Undead
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Compute autocorrelogram (correlogram) from a wave file?

How to compute autocorrelogram (correlogram) from a speech signal (as a wav file) in python? Is there any online code/library function available for that?
Shahan Ali Memon
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Voice recording spectrogram

I am creating a voice recording app wherein I have displayed a decibel meter. However, I would like to include a voice spectrogram on the lines of what is found in Dragon Dictate or Google Search applications. Any suggestions on where I can start…
Anand
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Need explanation how specgram function work in python (matplotlib - MATLAB compatible functions)

I'm working on converting my code from python to objective c. Inside matplotlib.mlab.specgram function I see 3 important functions before fft : result = stride_windows(x, NFFT, noverlap, axis=0) result = detrend(result, detrend_func, axis=0) …
hoangpx
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How do I read variable length 1D inputs in Tensorflow?

I'm trying to read variable length 1-D inputs into a Tensorflow CNN. I have previously implemented reading fixed length inputs by first constructing a CSV file (where the first column is the label and the remaining columns are the input values -…
kashkar
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Spectrogram of a wave file

I am trying to obtain spectrogram of a wav file in python. But it gives the error: 'module' object has no attribute 'spectrogram'. Here is the code : import scipy.io.wavfile from scipy.io.wavfile import read from scipy import signal sr_value,…
ali
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Inconsistent answers between the 'density' and 'spectrum' scaling option of scipy.signal.welch

I cannot get consistent answers when using the scipy.signal.welch function between the power spectrum density (PSD) 'density' and power spectrum 'spectrum' scaling options in Python 3. I know that the units for density are V^2/Hz and and for…
SpartanChew
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Removing padding from Matplotlib spectrogram

I'm trying to remove the white spaces padding matplotlib's generated spectrogram. I've tried setting a limit to the axis and setting tight to the axis but these don't work. Here's a screenshot: Thanks
congIA
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scipy.signal.spectrogram output not as expected

I am using scipy.signal.spectrogram() for analysing a dataset containing values for a current. My input to the function is as follows: f, t, Sxx = signal.spectrogram(y, fs) (for plotting in subplot 3 (from the top) I use plt.pcolormesh(t, f,…
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Can Python + Qt combination produce a real time spectral analysis tool?

I want to develop a tool that does the following things. take in a live voice recording produce a real time spectrogram show the time-domain signal output few values extracted from the spectral analysis All of these have to be kept updated in a…
gopalkoduri
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How to generate the spectrogram of a wav file in Matlab with frequency on the x-axis

As part of a research project, I would like to analyze a sound file by generating it's spectrogram. I have been able to successfully generate the spectrogram of the wave file in matlab with frequency on the y-axis and the time on the x-axis. I would…
Aditya
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Create 2D Spectrogram in Matlab

I am in need of plotting a 2D spectrogram of a signal in Matlab. I need it for a printed assignment, hence the 3D image makes no sense. However, when the signal is plotted using Spectrogram it automatically produces a 3D plot of the signal. My…
Mikkel Krogh Simonsen
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Plotting with matplotlib specgram?

I'm trying to plot a signal and the spectrogram of the signal with matplotlib, but... i get the spectrogram only for the first value (samples) of my signal (like 60 of the 30000...). It's a very long file, that's why I would like to plot only the…
Dadep
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Matlab's specgram outdate vs spectrogram replace

In Matlabs recent versions, the specgram function is being replaced by spectrogram, and the documentation states: Note. To obtain the same results for the removed specgram function, specify a 'Hann' window of length 256. Unfortunately, that…
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Time frequency spectrogram in Python

I have some 64 channel EEG data sampled at 256Hz and I'm trying to conduct a time frequency analysis for each channel and plot a spectrogram. The data is stored in a NumPy 3d array, where one of the dimensions has length 256, each element containing…
Simon
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