The FeatureSet Object

Tcl methods

Basic methods

SVector , FMatrix , delete

Define and delete Features.

puts , display

Show info and content.

JANUS interface methods

setDesc, setAccess, eval

Define 'Feature Description', 'Access Description' and do preprocessing.

ADC methods (SVector features)

readADC , writeADC

Read/Write Audio files (SVector features).

adc2pow , peak , maxpeak , zero

Frame based analysis of power, peak values and zero crossing rate.

silTK

Speech/silence detector.

spectrum, adc2mel

Frame based spectrum and melscale analysis.

tone, noise

Create signal and noise samples.

xtalk

Use adaptive filter to remove xtalk.

downsample

Downsample 16bit,16kHz to telephone quality 8bit,8kHz.

Spectrum, filterbank methods

melscale, auditory, postaud, plp

Calculating filterbank and cepstral coefficients from spectrum

Feature I/O

read, write

Read/Write FMatrix features.

Methods using one source

split, cut

Take some coefficients and cut out some frames (or samples).

flip, delta, shift, adjacent

Flip feature. Calculate delta coefficients. Shift frames. Create supervector with adjacent frames.

lin, log, exp, pow

Simple functions of the feature coefficients.

filter, normframe, meansub, offset, normalize, thresh

Filter features. Normalize frames. Do Meansubtraction, adaptive offset removal. Normalize feature channels. Cut off values exceeding a threshold.

cdcn

Codebook-dependent Cepstral Normalisation

Methods using more than one source

merge, concat

Merging and concatenating features together.

add, mul, matmul

Add, multiply 2 features and multiply feature with matrix.