FeatureSet method: downsample

Syntax: <feature set> downsample <new feature> <source feature>

Example: fs downsample ADC8 ADC16

A SVector feature with a sampling rate of 16kHz is downsampled to one with 8kHz simulating telephone quality. The downsampling includes the following steps:

Lowpass filtering

Highpass filtering

Quantization (compressing to 8bit a-law and back)