The stft tag has no wiki summary.
4
votes
3answers
196 views
What's the difference between the Gabor-Morlet wavelet transform and the constant-Q transform?
At a glance, the constant-Q fourier transform and the complex Gabor-Morlet wavelet transform seem the same. Both are time-frequency representations, based on constant-Q filters, windowed sinusoids, ...
4
votes
3answers
823 views
Can you increase frequency resolution of FFT without increasing window size?
I'd like to use STFT for multipitch analysis.
I realise detecting the partials existing in the signal is just the beginning.
Still I have problem with it.
Let's say I have signal sampled with 'CD' ...
0
votes
2answers
116 views
Discarding phase
What would happen if you took the STFT of a signal, discarded the phase information, and re-synthesized it? For example, just modulate oscillators tuned to each frequency bin by the amplitudes for ...
0
votes
1answer
109 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 ...
11
votes
1answer
1k views
Inverse Short Time Fourier Transform algorithm described in words
I'm trying to conceptually understand what is happening when the forward and inverse Short Time Fourier Transforms (STFT) are applied to a discrete time-domain signal. I've found the classic paper by ...
6
votes
2answers
650 views
Real-Time Human Pitch Detection
I'm trying to implement a singing game that will analise raw mic input and tell the player how good is he singing. That needs to be done in real-time.
I've come across a lot of threads asking the ...
7
votes
3answers
150 views
How critical is the selection of the window function in STFTs?
I have a sum of periodic signals that I am trying to untangle using time-frequency analysis. I seem to get wildly different results depending on the window length and shape. This is a problem because ...
8
votes
1answer
795 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:
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