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- MARCHING BAND SOUNDFONT MUSESCORE SERIAL
- MARCHING BAND SOUNDFONT MUSESCORE FULL
- MARCHING BAND SOUNDFONT MUSESCORE SOFTWARE
The multi-threaded program handles both the user interface and the audio processing, and sends note data to the external computer over a serial interface, where the Python script converts the incoming data into a MIDI file.
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The majority of the computation occurs on the PIC32 MCU.
MARCHING BAND SOUNDFONT MUSESCORE SOFTWARE
Our software components involve a protothreads C program running on the PIC32, and a Python script running on an external computer. The box was designed to expose only the TFT screen, Record switch, LED, microphone and keypad. To bring it all together, a box was designed using Autodesk Fusion 360, and laser-cut to make our project more presentable. To create the UART serial interface for this product, we connected a computer to the PIC32 using the Adafruit USB-to-TTL connector, which transferred data to the laptop computer for MIDI file generation. A wall socket powered the PIC32, which then powered the solder-board circuitry at 3.3V. Finally, the system had two output cables, one for power and one for the serial interface to the computer. The port expander was used to allow us to interface more hardware items with the PIC32. The PIC32, TFT and Microchip port expander were soldered onto a PCB designed by Sean Carroll. The microphone, amplifier and Sallen-Key circuits were constructed on a solder board. In terms of construction, our hardware was divided between a solder board and a PCB.
MARCHING BAND SOUNDFONT MUSESCORE FULL
The final amplification circuit is shown in the full schematic in Figure 2. After this amplification and filtering, the signal becomes the input to the PIC32’s ADC. The Nyquist requirement is met because 2.5kHz is less than half the sampling frequency, and there is no input energy from a flute at such high frequencies. We chose the frequency of 2.5kHz because it meets the Nyquist requirement and is well above the note range of a flute.Ī Fast Fourier Transform (FFT) is computed on the PIC32, which samples at 8kHz. The Sallen-Key filter was implemented to have a cut-off frequency of 2.5kHz and a Q of 1. After amplification, the signal is sent through an anti-aliasing, two-pole Sallen-Key filter. This gain was chosen because it increases the signal amplitude to the range of hundreds of millivolts, which is recognizable by the PIC32’s analog-to-digital converter (ADC). The signal is then sent through a non-inverting op amp with a gain of 50. Raw audio is picked up by an Adafruit electret microphone. The first portion of our hardware design was amplification and filtering. The user has access to the keypad and switch, and may view the LED and TFT display. At the end of the project, we had a nicely packaged product that demonstrated our ability to accurately notate simple melodies played on a flute.Īpart from Microchip Technology’s PIC32 microcontroller (MCU), the primary hardware components of this project are a microphone, filtering and amplification circuitry, a keypad, a toggle switch, an LED and a thin-film transistor (TFT) liquid crystal display (LCD) ( Figure 1). The use of MIDI, an industry-standard protocol for music notation, allows the output of our system to be loaded into any music-editing software. The computer compiles the data into a MIDI file, saves it and loads it into MuseScore, our group’s preferred music editing software.
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We then determine the note timings, and send that data to an external computer. In our PIC32-driven, end-to-end, software-hardware hybrid solution, we extract frequencies from the audio source, and convert them into the corresponding note in MIDI format. We aimed to eliminate a lot of the middle-ground work in the music composition process by creating a tool that generates sheet music after playing an instrument. This is why we created “PICcompose”-a tool that converts raw audio data into an editable music score. When brainstorming, a composer will often try ideas on an instrument and then manually translate these thoughts onto paper or software to generate the sheet music. It can be almost as difficult to notate the melodies as it is to find inspiration for them. As musicians, we know that composing music can be a time-consuming task.