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deltas

Calculate delta features

Description

Calculate the deltas (derivatives) of a sequence of features using a w-point window with a simple linear slope.

Usage

deltas(x, w = 9)

Arguments

x

Matrix of features. Every column represents one time frame. Each row is filtered separately.

w

Window width (usually odd).

Details

This function mirrors the delta calculation performed in HTKs ‘feacalc’.

Value

Returns a matrix of the delta features (one column per frame).

Author(s)

References

Examples

testsound <- normalize(sine(400) + sine(1000) + square(250), "16")
  m <- melfcc(testsound, frames_in_rows=FALSE)
  d <- deltas(m)
tuneR

Analysis of Music and Speech

v1.3.3
GPL-2 | GPL-3
Authors
Uwe Ligges <ligges@statistik.tu-dortmund.de> with contributions from Sebastian Krey, Olaf Mersmann, Sarah Schnackenberg, Guillaume Guenard, Andrea Preusser, Anita Thieler, Johanna Mielke and Claus Weihs, as well as code fragments and ideas from the former package 'sound' by Matthias Heymann and functions from 'rastamat' by Daniel P. W. Ellis. The included parts of the libmad MPEG audio decoder library are authored by Underbit Technologies.
Initial release
2018-07-03

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