It’s been a while since we’ve run a technical post here on the blog. I recently ran across a problem that seems to be quite common amongst iPhone game developers, so I thought I’d do a quick post on it: using IMA4 (ADPCM) audio encoding on the iPhone/iPod Touch. IMA-ADPCM is a compression standard defined by the Interactive Multimedia Association that gets you 4:1 compression on 16-bit audio files