MUS 15 Project 1: Creating Autotune From Scratch Using Phase Vocoders

Gino Prasad, Saba Heydari Seradj, Ashish Dalvi

05/03/2023

For our MUS 15 project, our group created an autotuner from scratch. All of the code was made from scratch by us using python. We have uploaded our code to https://github.com/GinoP123/AutotunePV.git

This autotuner works using a Phase Vocoder to shift a given sound to a different pitch. Then we used Yin Pitch detection to determine the pitch for a given sound clip, and pitched to the nearest note.

Here are the resources we used to create this:

• Designing the Phase Vocoder: https://www.youtube.com/watch?v=xGmRaTaBNZA

• Yin Pitch Prediction: http://audition.ens.fr/adc/pdf/2002_JASA_YIN.pdf

Autotuned Songs:

"Thinking Out Loud" (Ed Sheeran)

https://www.youtube.com/watch?v=byXb3KT1-3A

• D major

Original Audio:

Autotuned:

"I Heard It Through The Grapevine" (Marvin Gaye):

https://www.youtube.com/watch?v=87FjkqtK67o

• D# minor

Original Audio:

Autotuned:

"Boy's a Liar Pt. 2" (PinkPantheress, Ice Spice):

https://www.youtube.com/watch?v=hu6RWntTJqs

• C major

Original Audio:

Autotuned:

"Bad Romance" (Lady Gaga)

https://www.youtube.com/watch?v=iVD-S21ejSw

• A minor

Original Audio:

Autotuned:

Phase Vocoder Demo

The phase vocoder we made is able to scale the pitch of audio without changing its duration.

Here is the original clip from "I Heard It Through The Grapevine" by Marvin Gaye

Original Audio (1x Pitch):

1.5x Pitch:

0.75x Pitch: