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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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Which Spectrogram best represents features of an audio file for CNN based model?

I am looking to understand various spectrograms for audio analysis. I want to convert an audio file into 10 second chunks, generate spectrograms for each and use a CNN model to train on top of those images to see if they are good or bad. I have…
Teja8484
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too many indicies for an array

I've used the code from user Anil_M in this question i want to get the same result. but in My case it plots the first image and after that i get an error Traceback (most recent call last): File…
skdadle
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Tuple index out of range : Audio to spectrogram

I am trying to run an audio to spectrogram script, namely: https://github.com/grrrr/nsgt/tree/master/examples When I try python spectrogram.py myaudio.wav I get the error: Traceback (most recent call last): File "spectrogram.py", line 111, in…
Curiousmarble
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Reading off Amplitude from scipy spectrogram

It seems to me that the amplitude calculated in scipy.signal.spectrogram is not correct (in my case about 20% off). Is it possible to improve on this? Consider this example import matplotlib.pyplot as plt import numpy as np from numpy import pi as…
varantir
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Matplotlib - Tuning color parameters for spectrograms

I am tuning color settings of matplotlib images, but I am not sure which parameters should I toggle. Currently, my image looks like this: But I would like it to be like this: As shown, the whole color settings look darker and blur. I've tried…
sealpuppy
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Plot signal spectrogram image for each time step in python

I want to print a spectrogram image for each time step This is what i have tried import matplotlib.pyplot as plt import numpy as np import pandas as pd NFFT = 256 # the length of the windowing segments Fs = 64 # the sampling…
Hadeer Zayat
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How to display a spectogram inside a UIFigure?

I am trying to display a spectogram in a UIAxes using app designer in MATLAB 2018. The best method I've seemed to find is a workaround where I display a colored image of the spectogram as below. I've used an empty UIFigures position so that all my…
Intent Filters
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Remove the microseconds from matplotlib spectrogram

I've been trying to plot an spectogram based on a wav file of 15 minutes lenght. I think I managed to do this, but I can't remove the microseconds from my x axis ( time axis). Any help with this, please? This is the spectrogram obtained: This is…
PyRar
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Get more time points on x axis of a spectrogram

So I've represented a spectrogram for a relatively long video(15 minutes). On the time axis, I've got data points at each 3 minute and 20 seconds. This is my spectrogram: I would like to have data point on the x axis for every second. I've tries to…
PyRar
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how to plot time-frequency graph through spectrogram?

I'm trying to plot time-frequency graph through a spectrogram. I want to make one line graph (x axis = time, y axis = frequency). I use Python and signal.stft function and get a spectrogram. I also calculate max frequency value in each time step.…
YUN
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Keep the aspect ratio of an image based on the fft of a wave file

I am using import matplotlib.pyplot as plt from scipy.io import wavfile import numpy as np def graph_spectrogram(wav_file,png_file): rate, data = wavfile.read(wav_file) fig,ax = plt.subplots(1) …
Fabien Biller
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Matlab spectrograms giving imaginary-like numbers

I'm using MATLAB to work with some spectrograms. I'm new to this kind of thing and come from more of a CS background than a signals background, so I'm not sure what I'm missing here although it may turn out to be fairly basic. I'm trying to compute…
Tessa K
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How to compute "normalized" frequency from Mel Spectrogram?

I have computed the mel spectrogram with librosa like that: self.Spectrogram = librosa.feature.melspectrogram(y=self.RawSignal, sr=self.sampling_frequency, n_mels=128, fmax=8000) I need to…
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How do I apply a binary mask and STFT to produce an audio file?

So here's the idea: you can generate a spectrogram from an audio file using shorttime Fourier transform (stft). Then some people have generated something called a "binary mask" to generate different audio (ie. with background noise removed etc.)…
Blake H
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plotting very large 2D color map / waterfall / spectrogram

I am using matplotlib's pcolormesh for 2D plotting of large sets of X Y Z data where Z is the color intensity. I get the plots I want, but as the data is getting larger, the plotting gets slower and slower (> 30 min for each plot). Is there any way…
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