phonTools (version 0.2-1.1)

resample: Resample a Sound

Description

Resample a sound using sinc interpolation.

Usage

resample (sound, newfs, oldfs, precision = 50, filterorder = 200)

Arguments

sound

Either a numeric vector representing a sequence of samples taken from a sound wave or a sound object created with the loadsound() or makesound() functions.

newfs

The new desired sampling frequency.

oldfs

The original sampling frequency. If a 'sound' object is provided, this does not need to be specified.

precision

The number of samples before and after the current point to be used for interpolation.

filterorder

The number of taps to be used for the low-pass FIR filters used, where appropriate.

Value

• The resampled vector is returned. If a 'sound' object is passed, the resampled sound is returned as an object.

Details

The sound vector is resampled using sinc interpolation.

Examples

data (sound)
## downsample and then upsample the sound back to 
## its original sampling frequency
downsamped = resample (sound, 11025)
upsamped = resample (downsamped, 22050)

# compare a part of the waveforms for all three sounds
par (mfrow = c(3,1), mar = c(4,4,1,1))
plot (sound$sound[1:14000], type = 'l')
plot (upsamped$sound[1:14000], type = 'l', col = 2)
plot (downsamped$sound[1:7000], type = 'l', col = 4)