soundgen (version 2.7.2)

getFrameBank: Frame bank

Description

Internal soundgen function.

Usage

getFrameBank(
  sound,
  samplingRate,
  windowLength_points,
  wn,
  step,
  zp,
  normalize = TRUE,
  filter = NULL,
  padWithSilence = FALSE,
  timeShift = NULL
)

Value

A matrix with nrow = windowLength_points/2 and ncol

depending on length(sound) and step

Arguments

sound

numeric vector

samplingRate

sampling rate of x (only needed if x is a numeric vector)

windowLength_points

length of fft window (points)

wn

window type accepted by ftwindow, currently gaussian, hanning, hamming, bartlett, blackman, flattop, rectangle

step

you can override overlap by specifying FFT step, ms (NB: because digital audio is sampled at discrete time intervals of 1/samplingRate, the actual step and thus the time stamps of STFT frames may be slightly different, eg 24.98866 instead of 25.0 ms)

zp

window length after zero padding, points

normalize

if TRUE, scales input prior to FFT

filter

fft window filter (defaults to NULL)

padWithSilence

if TRUE, pads the sound with just enough silence to resolve the edges properly (only the original region is plotted, so the apparent duration doesn't change)

timeShift

time (s) added to timestamps

Details

A subroutine of spec that saves windowed (and optionally zero-padded) frames, i.e. chunks of the sound file of the right size and spacing. Handy for further processing.

Examples

a = soundgen:::getFrameBank(sin(1:1000), 16000, 512, 'gaussian', 15, 0)
str(a)