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Resampling - dspGuru
https://dspguru.com/dsp/faqs/multirate/resampling/#:~:text=A%20practical%20and%20well-known%20example%20results%20from%20the,%3D%20%28441%20%2F%20480%29%20%3D%20%28147%20%2F%20160%29
DigitalAudioResamplingHomePage
https://ccrma.stanford.edu/~jos/resample/resample.pdf
Shannon’s sampling theorem says it is possible to restore an audio signal exactly from its samples, it makes sense that the best digital audio interpolators would be based on that theory. Such “ideal” interpolation is called bandlimited interpolation. A bandlimited interpolation algorithm designed along these lines is described in the theory
c - Resampling a sound sample, what filter do I use ...
https://stackoverflow.com/questions/4393545/resampling-a-sound-sample-what-filter-do-i-use
Start with a simple linear interpolation: instead of setting cbuf[z] to sampdata[i], set it to sampdata[i] + (j/(double)a)(sampdata[i+1] - sampdata[i]). I don't know enough about sound processing to know if that's even near sufficient, but it'll keep you busy until someone comes along who knows their stuff :-) You may also need to anti-alias the downsample.
Which anti aliasing filter algorithm for efficient audio ...
https://dsp.stackexchange.com/questions/23416/which-anti-aliasing-filter-algorithm-for-efficient-audio-resampling
I'm building a real-time audio resampler (think pitch bend) that needs to have a several different performance vs quality configuration options. I understand that I'll need to apply a low-pass filter before resampling in order to avoid aliasing. The requirements for the first filter are this: very efficient; better than nothing
Fast resampling - which algorithm? - KVR Audio
https://www.kvraudio.com/forum/viewtopic.php?t=364821
Since I'm not really a DSP guy, I wrote a decent resampling algorithm, that is very fast, but not totally aliasing-safe in all cases. I used an hermite interpolation technique (you can find it at musicdsp.org), for lowering the pitch, and a series of different algorithms for raising the pitch that implements a simple kind of boxcar lowpass filter (the most basic one).
Resampling Algorithm (2.10) - PJSIP
https://www.pjsip.org/pjmedia/docs/html/group__PJMEDIA__RESAMPLE.htm
Create a frame based resample session. Pool to allocate the structure and buffers. If true, then high quality conversion will be used, at the expense of more CPU and memory, because temporary buffer needs to be created. If true, large filter size will be used. Number of channels. Clock rate of the input samples. Clock rate of the output samples.
Resampling - dspGuru
https://dspguru.com/dsp/faqs/multirate/resampling/
The interpolation factor is simply the ratio of the output rate to the input rate. Given that the interpolation factor is L and the decimation factor is M, the resampling factor is L / M. In the above example, the resampling factor is 147 / 160 = 0.91875. 4.1.4 Is there a restriction on the resampling factor I can use? Yes.
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