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How to emulate the effect of vinyl scratches when processing sound?

I am trying to make a simple "virtual scratcher", but I do not know the theory behind it. Since I did not find anything useful in google, I ask it here:

  • What happens when I scratch (move the track forward)? Do I raise the pitch and / or speed of the sample?
  • How can I emulate this phenomenon using sound processing algorithms?

Sample code / tutorials will be appreciated with dignity :-)

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3 answers

What happens when I scratch (move the track forward)? Do I increase the pitch and / or sampling speed?

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There are much better (higher sound quality) DSP methods for performing repeated sampling by speed than linear interpolation, for example, using the Sinc variable-width interpolation core.

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