Tiny Tapeout > Tiny Tapeout Chips > Tiny Tapeout SKY 26a > 931 Melody Generator based on Markov Chains
931 Melody Generator based on Markov Chains
931 : Melody Generator based on Markov Chains
- Author: Arellano Nordahl Jose Luis
- Description: A stochastic music generator using two Markov Chains for note selection and duration on a Pentatonic Scale. Features a 16-bit LFSR entropy source, adjustable BPM, and selectable probability matrices.
- GitHub repository
- Open in 3D viewer
- Clock: 1000000 Hz
How it works
Uses an LFSR to generate two 8-bit pseudonrandom numbers that are used to decide the transitions on two Markov Chains, one for the duration of the note and the other one for the note itself, then the logic control module uses two FSM to model the Markov Chains and indicate to the final module, a PWM generator, the target note.
How to test
You have 6 inputs you can change however you want, four are for the last 4 bits of the seed of the LFSR, so you have up to 16 different melodies, and two other inputs that change The dynamic of the melody, making it go faster (60 or 120 BPM), and the other affects the duration of the notes.
External hardware
A PMOD of a buzzer is required.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | seed_0 | pwm_out | none |
| 1 | seed_1 | none | none |
| 2 | seed_2 | none | none |
| 3 | seed_3 | none | none |
| 4 | bpm_sel | none | none |
| 5 | dur_matrix_sel | none | none |
| 6 | none | none | none |
| 7 | none | none | none |