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how is it interpreted?

musica

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what do you understand from this spectrogram?
Vogue-mnvhHxjIgWo.png
 
Is it a sub playing a circa 50hz tone? Or some kind of low frequency noise?

Not sure why there is a gap at 4.40. Or why its brickwalled at 95hz
 
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is it only used for low frequencies?
 
That there's a lot of energy in the 45-50Hz range?

What are you trying to learn from it?
 
is it only used for low frequencies?
Depends what you are looking for or trying to understand. Where is that specto from and why are you looking at it ?
 
What can we understand using these spectrograms?
 
I don't know what can be learned, I ask you this

1) The recording/speaker rolls off around 35Hz as the content below that is likely noise.

2) between 40-50 Hz there are peaks. Either the instrument on the recording has this as a fundamental, or this is a peak in the room that is exaggerated.

3) There is a gap and then a restart. There is no noise is this gap, so if this is a mic recording, there are dropped frames or if this is a digital analysis of a recording, we just want from one track to the next

Without some boundary conditions or info, there is very little more that you can comment.

For example:
1+1=2

What can be learned from this? It could be a simple fact that one added to one equals two. Maybe the plus in in blue because this is supposed to be a first grade test and someone has filled in the blank and the blue is what is written by the user. There are different fonts and sizes. Maybe this is just a test of HTML rendering and the forum software, etc.
 
What can we understand using these spectrograms?

What the sounds/ music looks like in terms of frequency and amplitude over time. So in the one you showed you have around 5 minutes of signal with low volume sounds between 20hz and 95hz but a couple of strong tones at 45 and 50 hz (the yellow) going pretty much throughout. And a 20 second silence around 4min 40/ 280 secs.

But you are only seeing the lowest 100hz of a 20000hz audible band- so not even all the bass. So its only telling you what the sonic content is in the bottom 3 octaves (and looking at the 95hz cutoff, perhaps thats all there was there anyway)
 

the spectrogram is from this video
 
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We guessed that from the tag on the spectro- but its not the whole song- its only the bass and Im not sure its actually that even.

So where did you get the spectrogram from?
 
FOR %%A IN (%*) DO sox %%A -n remix - rate 200 spectrogram -z 60 -o "%~dp1%subdirname%\%%~nA.png" -t "%%~nxA"
from this script
 
If you want a tutorial on doing spectrograms using SOX and interpreting them, then ask that. If you have a particular goal in mind- state it. Your OP is at best vague and open ended and could be construed as time wasting.

And please- do your own web research before coming here to ask questions.
 
What can we understand using these spectrograms?
It depends what the spectrogram is of.

You have to know what is measured, how it is measured, as well as the result of the measurement (spectrogram) if you want to draw correct conclusions.

What you are doing is like showing a random waveform and asking for what can be understood, without knowing if it is a waveform showing (for examples) the speed of a car, or seismic vibrations.


EDIT - now you have shown it is a song, but the spectrogram is incomplete showing only frequencies up to 100Hz, and with a gap at around 270 seconds. It is not very useful as analysis of the songs spectral content.
 
It depends what the spectrogram is of.

You have to know what is measured, how it is measured, as well as the result of the measurement (spectrogram) if you want to draw correct conclusions.

What you are doing is like showing a random waveform and asking for what can be understood, without knowing if it is a waveform showing (for examples) the speed of a car, or seismic vibrations.


EDIT - now you have shown it is a song, but the spectrogram is incomplete showing only frequencies up to 100Hz, and with a gap at around 270 seconds. It is not very useful as analysis of the songs spectral content.
Nor do we have any idea why OP is (trying ) to analyse spectral content despite at least 3 separate requests .
 
I want to understand in all the songs which are the frequencies that have more energy?
this song is just an example
 
I want to understand in all the songs which are the frequencies that have more energy?
this song is just an example
Then you need to figure out how to take (or show ) a full range 20 hz to 20khz spectrogram. I don't even believe the one you posted is a correct representation of vogue below 100hz (there isn't 2 constant high level 45 and 50 hz tones in the song )
 
What can we understand using these spectrograms?
A spectrogram shows where the energy is distributed in the frequency range (the 'spectrum').

Brighter color = more energy.

Whatever your picture is, it isn't a full spectrum for Madonna's 'Vogue'. Everything above 95 Hz is missing. That apparently eliminates the synth strings intro, and I'm guessing the weird gap at 270 sec is the piano/vocal breakdown.

You say you want to know 'where all the energy goes' in a track. You've been told several times now how to determine that: generate a full spectrogram. (I'll save you some time: most of the time, there's more energy in the bass than anywhere else)

But why do you want to know?
 
how can a full spectrum of this song? , I'm curious
 
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