Mark Cerny confirmed in an interview that PlayStation 4 uses hardware expressly dedicated to audio tasks. What are the capabilities of this hardware? What is Sony telling to developers about it?
Here we have some material from Sony’s presentations where you can learn more about audio custom hardware in PS4. This dedicated hardware will manage basic tasks, for game or system, relying on the CPU or GPU for advanced tasks.
Another important point is that this audio block is not programmable by developers directly, they could only access it via OS.