Audio Syntiant
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The Audio Syntiant processing block extracts time and frequency features from a signal. It is similar to the Audio MFE but performs additional processing specific to the Syntiant NDP101/120 chip. This block can be used only with Syntiant targets.
Log Mel-filterbank energy features
Frame length: The length of each frame in seconds
Frame stride: The step between successive frame in seconds
Filter number (fixed): The number of triangular filters applied to the spectrogram
FFT length (fixed): The FFT size
Low frequency (fixed): Lowest band edge of Mel-scale filterbanks
High frequency (fixed): Highest band edge of Mel-scale filterbanks
Preemphasis
Coefficient: Pre-emphasis coefficient
Chip
Features extractor: Syntiant method to generate features, choose accordingly to your chip
The features' extractions is a proprietary algorithm from Syntiant. However parameters are very close to the Audio MFE. Pre-emphasis coefficient is applied first to amplify higher frequencies. The signal is then divided in overlapping frames, defined by the Frame length and Frame stride to extract speech features.
