Audio in Samsung's Galaxy S III is provided by a chip from Edinburgh-based Wolfson.
The device is the WM1811'audio hub',and the design-in follows Samsung's use of the earlier WM8994 in the Wave and Galaxy S.
Wolfson's audio hubs mop up all or most of the audio functions in a phone,providing analogue functions like microphone,speaker and headset interfaces,as well as off-loading digital audio processing from the phone's application processor,and providing some power supply functions.
In the WM1811 case,the speaker driver is a 2x2W stereo class D amplifier,and on-chip digital processing includes:stereo full duplex asynchronous sample rate conversion,multi-channel digital mixing(plus analogue mixing)and a programmable parametric equalisation.
Playback signal to noise ratio is claimed to be 100dB(A weighted)during DAC playback.
