Gregory's ServerI have zero musical skills so I made it pentatonic, which means I can just bash keys at random and it will sound quite pleasant.
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5 comments
Dag Ågren ↙︎↙︎↙︎
I love the Karplus-Strong algorithm, it is a completely bullshit way to simulate a stringed instrument cheaply: https://en.wikipedia.org/wiki/Karplus–Strong_string_synthesis It can be a bit tricky to tune that algorithm since in its simplest form it can only be tuned to integer divisions of the audio frequency. Using just intonation helps here!
Dag Ågren ↙︎↙︎↙︎
The sample rate is 48000 Hz, and the "strings" are tuned to that divided by 54, 64, 72, 81 and 96, and then double those.
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@WAHa_06x36 Thank you very much for sharing this. I love that you're providing details about the implementation and design decisions. 👍 |
For the technical details, it's built around a Sipeed Longan Nano microcontroller module, connected up to a small amplifier, some little pill box speakers, and a bunch of microswitches. The microcontroller itself is a GD32VF103, a weird Chinese creation of dubious legality that stuffs a RISC-V core into a clone of an STM32F103 to replace the original ARM core.
It's pretty fast, and can run the built-in tiny LCD at 60 FPS along with 10 voices of Karplus-Strong synthesis.