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Does anyone know how does the "Songify" app algorithm work?

There are 2 inputs:

  • speech (or amateur singing), and
  • underlying music.

Somehow the speech is altered and mixed into the music. Which DSP algorithms are needed to achieve this effect?

  • Pitch-shifter?
  • Time-stretcher?
  • Fundamental (F0) frequency detection?
  • Auto-tune?
  • Else?

What would be the steps?

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Check the Melodify SDK, does the same thing.

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    $\begingroup$ Can you please expand a little on what the linked-to page says? Generally link-only answers on StackExchange are not very highly regarded. $\endgroup$ – Peter K. Jul 29 '13 at 16:13
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Songify seems use Prosodic Modification (Pitch, Time) for monophonic signals:

  • First you need get the pitch contour and pitch duration from musics you want to follow (use one pitch track for monophonic signal like YIN, AMDF, Auto-Correlation)

  • Split your imput signal in voiced/unvoiced

  • Apply Pitch Scale Modification in voiced parts to match your extracted pitch contour (you can use PSOLA technique here)

  • Apply Time stretch to match your extracted pitch duration (you can use PSOLA technique here)

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