A spectrogram is a time-varying spectral representation (forming an image) that shows how the spectral density of a signal varies with time.
1
vote
1answer
45 views
Programming language for sound manipulation
Having had little experience in PHP, I moved to C++ in-order to create a spectrogram, I wanted to create probably the simplest/easiest one for my first project, so easy infact I don't need ...
0
votes
0answers
29 views
cross spectrogram to compare similarity between two signals [closed]
I computed the spectrogram of two audio signals. How can i find the cross spectrogram from them.I want to find the pixels in the two spectrogram s which are similar.
3
votes
2answers
65 views
What is the theoretic difference in the ways to compute the spectrogram?
I have noticed that the spectrogram for a audio signal is often calculated in different ways when the result from the DFT is transformed into real numbers; some tend to compute $|k|$ or $|k|^2$ while ...
3
votes
0answers
70 views
Points of interest in a spectrogram
We have several audio tracks, all of which are different versions of the same track under one type of distortion: the speed of the track is increased by a constant factor K (hence frequences are ...
3
votes
1answer
129 views
Spectrogram Analysis
I have four .wav files and each contain bird chirps. Given an input .wav file, I need to find out which bird it is.
I have some basic understanding of signal processing. I have used spectrogram to ...
2
votes
1answer
61 views
Convolving With half-Hanning
The goal is to get a 200ms decaying delay of an audio signal while preserving the sharpness of attacks to mimick human perception of sound. The paper I'm following convolves a 200ms half-Hanning ...
2
votes
0answers
38 views
Compressing A Range Of Decibel Values to One “Representative” Value
Don't have any formal dsp experience - sophomore in college.
Working on constructing a 25 band bark spectrogram for psychoacoustic analysis of audio FFT data. To do this, I'm grouping all FFT ...
2
votes
2answers
79 views
Finding the frequencies given in a wav file
I have a wav file containing a series of chords, each containing 3 or 4 notes, played concurrently.
I need to find the frequencies of each note in each chord, and I can use matlab to do any ...
4
votes
4answers
140 views
Vertical lines noise in spectrogram
I have started looking into DSP and made an implementation of short-time fourier transform, using kissFFT to perform the FFT. I then render a spectrogram.
An example image that I have generated can ...
0
votes
0answers
35 views
are there any tools available that will output audio spectrum as raw data?
Is there an app or script that will output raw text data representing an arbitrary number of bands in the audio spectrum of an input file like a .wav or .mp3 to make the data equivalent of a ...
1
vote
1answer
191 views
why is the spectrogram from matlab different from audacity
Something related
Here are the spectrogram plots:
Matlab version:
Audacity version:
the darker parts towards the right of the figure show speech. Silence was added to the left of the figure in ...
2
votes
1answer
423 views
Please help me analyse spectrogram
I am working on noise reduction and I need to learn how to analyze spectrograms
I mixed a pure speech file with violet noise in audacity and got the following spectrograms:
Matlab version
...
1
vote
3answers
139 views
When should I use a frequency spectrum rather than a spectrogram representation?
It seems to me that the spectrogram representation of a finite signal gives you significantly more useful information than a frequency spectrum. As I understand it, the spectrogram breaks down the ...
1
vote
2answers
143 views
Deriving the frequency spectrum graph from the graph of a spectrogram and vice versa?
I have a signal's spectrogram and frequency spectrum (which, if i'm not mistaken, is its the signal's fourier transform) as given below:
I understand that the spectrogram plots the frequency ...
0
votes
3answers
261 views
Reconstruction of Audio Signal from its Absolute Spectrogram
I have the absolute Spectrogram of an audio signals.
I lost the phase data of the Spectogram because of various processing applied on the original spectrogram of the signal.
I'm trying to reconstruct ...
1
vote
1answer
128 views
Using Spectrogram to check whether aliasing will occur
I was wondering if the spectrogram can be used as a MATLAB tool to check whether or not aliasing will occur when the signal is downsampled from let's say, 44.1kHz to 8kHz? And if yes, how do I go ...
0
votes
1answer
117 views
Spectrogram for created signal
I'm trying to test the specgram function located in the signal package in octave but I'm a little confused at the variables in specgram. What I would like to do is be able to get the specgram data ...
3
votes
1answer
297 views
What is the best way to represent audio visually? (x-post from UX)
Original Question: http://ux.stackexchange.com/q/23040/16006
I've only taken some basic signal analysis courses, so I might be missing some things.
Purely theoretical question:
What methods exist ...
3
votes
4answers
5k views
How do I plot the spectrogram of a wav file?
I am dabbing a little bit into signal processing on MATLAB. And I have the following question that I would like to know the answer to.
What has to be done : Plot the Spectrogram of an audio file.
...
11
votes
2answers
2k views
Improving spectrogram resolution in Python?
I'm using the specgram() function in matplotlib to generate spectrograms of speech wave files in Python, but the output is ...
5
votes
1answer
979 views
Creating a spectrogram
I've been trying to work out the logic for this task, and plan to use the KissFFT source package to perform the fast fourier transform. Please let me know if this looks about right:
Allocate an FFT ...
8
votes
1answer
854 views
What is the maximal frequency resolution for Matlab's STFT implementation spectrogram()?
Matlab's spectrogram() function calculates the STFT of a signal. It describes its NFFT argument as follows:
...
4
votes
2answers
518 views
Finding pitch from a wideband spectrogram
We can use the narrowband spectrogram for finding the pitch of an utterance. But is it possible to find the pitch using the wideband spectrogram? If so, how would that be done?
