This is the fourth in a series of posts on emulating the main Sega Genesis sound chip, the YM2612. Part 1 - Interface Part 2 - Phase Part 3 - Envelopes This post will describe how the chip computes operator and channel outputs given the phase generator and envelope generator outputs.| jsgroth's blog
This is the second in a series of posts on emulating the main Sega Genesis sound chip, the YM2612. Part 1 - Interface This post will describe the FM synthesis channels’ phase generators. Phase Generation Each of the YM2612’s 24 operators contains a phase generator and an ADSR envelope generator.| jsgroth's blog
This is the first post in a series on emulating the main Sega Genesis sound chip, the Yamaha YM2612 FM synthesis chip, also known as the OPN2. To date, the YM2612 is pretty easily the most difficult-to-emulate sound chip that I have worked on.| jsgroth.dev
Where the last post focused on the PlayStation SPU’s audio format and how to implement ADPCM decoding, this post will focus on volume and envelopes. The SPU supports a number of different volume multipliers: some as constant volumes, and some as volumes that automatically adjust themselves over time using what are called envelope generators.| jsgroth.dev