setExtractorParams
Set nondefault parameter values for individual feature extractors
Description
setExtractorParams(
specifies parameters used to extract aFE,featureName,params)featureName.
setExtractorParams(
returns the parameters used to extract aFE,featureName)featureName to default
values.
Examples
Extract Pitch Using the LHS Method
Read in an audio signal.
[audioIn,fs] = audioread("Counting-16-44p1-mono-15secs.wav");Create an audioFeatureExtractor object to extract pitch. Set the method of pitch extraction to "LHS".
aFE = audioFeatureExtractor("SampleRate",fs,"pitch",true); setExtractorParams(aFE,"pitch","Method","LHS")
Call extract and plot the results.
f0 = extract(aFE,audioIn); plot(f0)
Modify Spectral Rolloff Threshold and Mel Spectrum Parameters
Read in an audio signal.
[audioIn,fs] = audioread("Counting-16-44p1-mono-15secs.wav");Create an audioFeatureExtractor object to extract the melSpectrum and spectralRolloffPoint. Specify ten bands for the mel spectrum and set the threshold for the rolloff point to 50% of the total energy.
aFE = audioFeatureExtractor("SampleRate",fs,"melSpectrum",true,"spectralRolloffPoint",true); setExtractorParams(aFE,"melSpectrum","NumBands",10) setExtractorParams(aFE,"spectralRolloffPoint","Threshold",0.5)
Call extract and plot the results.
features = extract(aFE,audioIn);
idx = info(aFE);
surf(10*log10(features(:,idx.melSpectrum)))
title('Mel Spectrum')
plot(features(:,idx.spectralRolloffPoint))
title('Spectral Rolloff Point')
To return individual audio feature extractors to their default values, call setExtractorParams without specifying any parameters to set.
setExtractorParams(aFE,"melSpectrum") setExtractorParams(aFE,"spectralRolloffPoint")
Call extract and plot the results.
features = extract(aFE,audioIn);
idx = info(aFE);
surf(10*log10(features(:,idx.melSpectrum)))
title('Mel Spectrum')
plot(features(:,idx.spectralRolloffPoint))
title('Spectral Rolloff Point')