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> MFCC (mel-frequency cepstrum coefficients) For anyone else who had never heard of "cepstrum" before, this is what I found on Wikipedia: "The cepstrum is the

> MFCC (mel-frequency cepstrum coefficients) For anyone else who had never heard of "cepstrum" before, this is what I found on Wikipedia: "The cepstrum is the result of computing the inverse Fourier transform of the logarithm of the estimated signal spectrum. The method is a tool for investigating periodic structures in frequency spectra. The power cepstrum has applications in the analysis of human speech. The term cepstrum was derived by reversing the first four letters of spectrum. Operations on cepstra are labelled quefrency analysis (or quefrency alanysis), liftering, or cepstral analysis."

a-dub 5y ago
wikipedia's sections on signal processing and data compression have jumped to near textbook quality in the past few years. the cepstrum is awesome, it comes from the source-filter model of human speech. by looking at the periodicities in the frequencies, it attempts to capture the resonance of the filter that models the vocal tract.
- spyremeown 5y ago
  >wikipedia's sections on signal processing and data compression have jumped to near textbook quality in the past few years. I pretty much used Wikipedia as my main resource when I was learing dsp at college. I get like 80% of my EE information from Wikipedia nowaydays, for a ton of different areas. A couple days ago I was reading Meindl's paper on boron implantation in MOSFETs and I don't recall exactly what it was, but it was such an obscure topic in the paper my colleages had quite the trouble and ultimately did not find more resources on it. There was literally a whole Wikipedia section dedicated to the concept and it saved my goddamn ass in the presentation I had the next day. I absolutely love Wikipedia and I owe a lot of my education to the contributors.
- duped 5y ago
  Cepstral analysis has a pretty good statistical basis (no pun intended) away from the source/filter model. There's a bit of magic in the MFCC computation where you apply the discrete cosine transform (DCT). That's all about reducing correlation between components in the cepstrum and makes no sense unless you "get" the way the change of basis has high energy compaction (more information in fewer values). However this has nothing to do with a physiological understanding of human speech.

a-dub 5y ago

wikipedia's sections on signal processing and data compression have jumped to near textbook quality in the past few years. the cepstrum is awesome, it comes from the source-filter model of human speech. by looking at the periodicities in the frequencies, it attempts to capture the resonance of the filter that models the vocal tract.

spyremeown 5y ago
>wikipedia's sections on signal processing and data compression have jumped to near textbook quality in the past few years. I pretty much used Wikipedia as my main resource when I was learing dsp at college. I get like 80% of my EE information from Wikipedia nowaydays, for a ton of different areas. A couple days ago I was reading Meindl's paper on boron implantation in MOSFETs and I don't recall exactly what it was, but it was such an obscure topic in the paper my colleages had quite the trouble and ultimately did not find more resources on it. There was literally a whole Wikipedia section dedicated to the concept and it saved my goddamn ass in the presentation I had the next day. I absolutely love Wikipedia and I owe a lot of my education to the contributors.
duped 5y ago
Cepstral analysis has a pretty good statistical basis (no pun intended) away from the source/filter model. There's a bit of magic in the MFCC computation where you apply the discrete cosine transform (DCT). That's all about reducing correlation between components in the cepstrum and makes no sense unless you "get" the way the change of basis has high energy compaction (more information in fewer values). However this has nothing to do with a physiological understanding of human speech.