The Resample command resamples audio data, producing a new audio object with the specified sample rate.

The audArray parameter specifies the audio to resample, and must be a dense, rectangular, one or two dimensional Array, Vector, or Matrix with datatype=float[8].

The samplesPerSec parameter specifies the desired sample rate. Typical values are 11025, 22050, and 44100 samples per second.

By default, resampling is done using B-spline interpolation.  This produces excellent results reasonably fast.

If the method=nearest option is specified, resampling is done using the nearest-neighbor algorithm. This produces poorer results, but the algorithm is very fast.  This method is often suitable for producing low-quality resamplings of audio data.

Specifying method=bspline is equivalent to the default behavior.

$\mathrm{audiofile}≔\mathrm{cat}\left(\mathrm{kernelopts}\left(\mathrm{datadir}\right)\,''/audio/stereo.wav''\right)\:$

$\mathrm{with}\left(\mathrm{AudioTools}\right)\:$

$\mathrm{aud}≔\mathrm{Read}\left(\mathrm{audiofile}\right)$

$\mathrm{aud}≔\left[\begin{array}{cc}''Sample\; Rate''& 22050\\ ''File\; Format''& \mathrm{PCM}\\ ''File\; Bit\; Depth''& 8\\ ''Channels''& 2\\ ''Samples/Channel''& 19962\\ ''Duration''& 0.90531s\end{array}\right]$

$\mathrm{attributes}\left(\mathrm{aud}\right)$

$22050,8,1$

$\mathrm{small}≔\mathrm{Resample}\left(\mathrm{aud}\,11025\right)$

$\mathrm{small}≔\left[\begin{array}{cc}''Sample\; Rate''& 11025\\ ''File\; Format''& \mathrm{PCM}\\ ''File\; Bit\; Depth''& 8\\ ''Channels''& 2\\ ''Samples/Channel''& 9981\\ ''Duration''& 0.90531s\end{array}\right]$

$\mathrm{attributes}\left(\mathrm{small}\right)$

$11025,8,1$