Synthesizing Strings on a Cyclone V

Cornell students [Erissa Irani], [Albert Xu], and [Sophia Yan] built a FPGA wave equation music synth as the final project for [Bruce Land]’s ECE 5760 class.

The team used the Kaplus-Strong string synthesis method to design a trio of four-stringed instruments to be played by the Cyclone V FPGA. A C program running on the development board’s ARM 9 HPS serves as music sequencer, controlling tempo and telling the FPGA which note to play.

The students created versions of four songs, including “Colors of the Wind” from the Pocahantas soundtrack, “Far Above Cayuga’s Waters” (Cornell’s alma mater) and John Legend’s “All of Me”. A simple GUI allows the viewer to select a song and to choose which instrument or instruments to play, providing multiple variations for each song.

Thanks, [Bruce]!

Continue reading “Synthesizing Strings on a Cyclone V”

The 35 Year Music Synthesizer that Spawned Chiptune

If you are a certain age, MOS6581 either means nothing to you, or it is a track from Carbon Based Lifeforms. However, if you were a Commodore computer fan 35 years ago, it was a MOS Technologies SID (Sound Interface Device). Think of it as a sound “card” for the computers of the day. Some would say that the chip — the power behind the Commodore 64’s sound system — was the sound card of its day. Compared to its contemporaries it had more in common with high-end electronic keyboards.

The Conversation has a great write up about how the chip was different, how it came to be, the bug in the silicon that allowed it to generate an extra voice, and how it spawned the chiptune genre of music. The post might not be as technical as we’d do here at Hackaday, but it does have oscilloscope videos (see below) and a good discussion of what it took to create music on the device.

Continue reading “The 35 Year Music Synthesizer that Spawned Chiptune”