In music practice, musicians can’t know that the song they play is correct,like in the note 100 percent or not. So we built a tool that can help them score the playing.For some people who want to play the song they like but can’t transcribe or find the note.This tool can be helped by listening to the song or music to transcribe it ,and convert audio to music notes.
We use Fast fourier transform (FFT) to screen the sound out to any frequency. By converting input sound from analog to digital, using Analog-to-digital converter (ADC).And the results are displayed with LCD and Web-based Dashboard.

1. Introduction

Among the musical instruments, we select the piano as a sound to analyze the frequency to identify notes. What’s more, we are more intimate with the piano and it's uncomplicated than other musical instruments like Stringed musical instruments such as Violin, Guitar etc.

1.1 Principle

At first, we received a piano sound with a microphone. Change the sound signal from analog to digital for a separate sound frequency with FFT and analyze that frequency for which note it is. We can transform analog to digital by using INMP441, which can transform in itself.
For microcontrollers, we use ESP32 as it. We use the I2S interface for high fidelity audio.

1.2 Theory

For how correctly players can play the music. We need to separate the frequency of the sound of the piano by using FFT and transform that into the music note sheet.

1.2.1 Fast fourier transform (FFT)