Normfeat

Copyright 2014-2015 Anthony Larcher and Sylvain Meignier

frontend provides methods to process an audio signal in order to extract useful parameters for speaker verification.

frontend.normfeat.cms(features, label=[])[source]

Performs cepstral mean subtraction

Parameters:
  • features – a feature stream of dimension dim x nframes where dim is the dimension of the acoustic features and nframes the number of frames in the stream
  • label – a logical verctor
Returns:

a feature stream

frontend.normfeat.cmvn(features, label=[])[source]

Performs mean and variance normalization

Parameters:
  • features – a feature stream of dimension dim x nframes where dim is the dimension of the acoustic features and nframes the number of frames in the stream
  • label – a logical verctor
Returns:

a sequence of features

frontend.normfeat.normalize_feature_stream(features, label=[], mode='cmvn', win='301', normVar=False, keepAllFeatures=False)[source]

Normalize features from a feature stream by using either ‘cms’, ‘cmvn’ or ‘stg’

Parameters:
  • features – a feature stream to normalize
  • label – a logical vector True if the frame should be processed. By default, all frames are considered True.
  • mode – normalization to apply: ‘cms’, ‘cmvn’ or ‘stg’. Default is ‘cmvn’.
  • win – for ‘stg’ mode only, size of the sliding window. Default is 301.
  • normVar – for ‘cmvn’ mode only, if True normalize the variance. Default is False.
  • keepAllFeatures – boolean, if True, keep also non-processed features
Returns:

a sequence of features

frontend.normfeat.rasta_filt(x)[source]

Apply RASTA filtering to the input signal.

Parameters:x – the input audio signal to filter. cols of x = critical bands, rows of x = frame same for y but after filtering default filter is single pole at 0.94
frontend.normfeat.stg(features, label=[], win=301)[source]

Performs feature warping on a sliding window

Parameters:features – a feature stream of dimension dim x nframes where dim is the dimension of the acoustic features and nframes the number of frames in the stream
Returns:a sequence of features

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