en:tutorium_sound

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Nächste Überarbeitung 		Vorhergehende Überarbeitung
en:tutorium_sound [2021/09/29 12:43]
andres_romero angelegt 		en:tutorium_sound [2022/02/22 10:36] (aktuell)
martin [Further parameters]
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 In the menu window you can set the number of coefficients. Usually there are 20 coefficients, but you can also set a finer resolution.  In the menu window you can set the number of coefficients. Usually there are 20 coefficients, but you can also set a finer resolution. 
 +
 +====Further parameters====
 +
 +The Vamp plugins can be used to determine other metrics related to the sound and sonic perception of an audio signal. Here are the most important parameters in alphabetical order: 
 +
 +  * **Harmonic Ratio**: Proportional amount of harmonic components within a signal. 
 +
 +  * **Signal to Noise Ratio (SNR)**: Ratio of signal to (background) noise.
 +
 +  * **Spectral Crest**: Ratio of the maximum value of a spectral distribution to the arithmetic mean; indicator of the degree of tonality of a signal. 
 +
 +  * **Spectral Entropy**: Measure for the degree of order and redundancy of a signal. White noise has low degree of order and therefore a high entropy value. 
 +
 +  * **Spectral Flatness**: Another measure for the uniformity (cf. Spectral Entropy). 
 +
 +  * **Spectral Roll-Off Point**: 85% of the energy of a signal is located below its //Roll-Off-Point// frequency.  
 +
 +  * **Spectral Skewness**: Measure for the symmetry of a spectrum above the mean (median); a high value implies a tendency (//skewness//) to high frequency components, a low value implies a tendency to low frequency components. 
 +
 +  * **Spectral Slope**: A measure for energy decay in the high frequency range; provides clues to the color of noise or the dominance of (high) partials in the spectrum.  
 +
 +  * **Spectral Spread**: Measure for the degree of spread of a spectrum around the [[en:tutorium_sound#spectral_centroid|spectral centroid]]; used to distinguish between periodic signals and noise. 
 +
 +  * **Zero Crossing Rate**: Rate of zero crossings per time; a high rate indicates a noisy signal or noise.   
  
 ====Deepening==== ====Deepening====
 The Vamp plugin //Aubio Spectral Descriptor// offers more spectral descriptors to choose from. Test these with //Audio02.mp3// and with music examples of your own choice.   The Vamp plugin //Aubio Spectral Descriptor// offers more spectral descriptors to choose from. Test these with //Audio02.mp3// and with music examples of your own choice.  
  
  • en/tutorium_sound.1632919386.txt.gz
  • Zuletzt geändert: 2021/09/29 12:43
  • von andres_romero