audlib.sig.transform provides simple-to-use interfaces for common transforms used in speech processing by assembling functions in:
stproc provides a useful pipeline for short-time processing
fbanks holds useful filterbanks
temporal holds temporal processing functions such as LPCs and zero-crossings
spectral holds spectral processing functions such as DCT and cepstrum
Use functions in transform if you want to:
Extract features with quick one-liners.
Visualize spectrographic representation of audio signals.
Do not use functions in transform if:
Speed is of critical importance. Functions such as mfcc will involve a huge amount of redundant computation for batch processing. Instead, construct Mel filterbanks with fbanks.MelFreq and compute MFCCs from there.
Batch extract a large number of features. Chances are most features share a common pipeline (e.g. short-time framing). In that case, manually construct the pipeline with stproc.stana to avoid redundant computation.
Interface for Common Transforms
audlib.sig.transformprovides simple-to-use interfaces for common transforms used in speech processing by assembling functions in:stprocprovides a useful pipeline for short-time processingfbanksholds useful filterbankstemporalholds temporal processing functions such as LPCs and zero-crossingsspectralholds spectral processing functions such as DCT and cepstrumUse functions in
transformif you want to:Do not use functions in
transformif:Speed is of critical importance. Functions such as
mfccwill involve a huge amount of redundant computation for batch processing. Instead, construct Mel filterbanks withfbanks.MelFreqand compute MFCCs from there.Batch extract a large number of features. Chances are most features share a common pipeline (e.g. short-time framing). In that case, manually construct the pipeline with
stproc.stanato avoid redundant computation.Complete List of Supported Transforms
stft- short-time Fourier transformistft- inverse short-time Fourier transformstlogm- short-time log magnitude spectrastrcep- short-time real cepstrastccep- short-time complex cepstrastpsd- short-time power spectral densitystcqt- short-time constant-Q transformmelspec- Mel spectrogrammfcc- Mel frequency cepstral coefficients