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RS Audio Codec
This page provides information and some examples for the use of the RS Audio Codec sub board, based on TI's TLV320 chip. This chip provides a high quality audio link out and in to the mbed with IO including: an amplified stereo headphone out, an stereo line out, a stereo line in and an pre-amped mono microphone input. Such a capable chip opens up a lot of options for high quality audio on mbed. 
The easiest way to get something working is to load a test wave file (such as this one or this one) onto a flash drive, plug it into the Lab Board and load up this program:
Import programWavPlayer_test
A test program for the WavPlayer class, works on the RS Animatronic Lab Board
Last commit 24 Sep 2012 by 
Giles Barton-Owen
or just this one:
Import programTLV320_Write_test
A test program for the TLV320, Generates some sine waves.
Last commit 19 Sep 2012 by Giles Barton-Owen
Both programs use the TLV320 library and the I2S library:
Import libraryI2S
A well tested I2S library where the send and recieve parts are seperate instances.
Last commit 19 Sep 2012 by Giles Barton-Owen
Import libraryTLV320
A fairly well tested TLV320 library for I2C configuration and control of the TI TLV320 part
Last commit 25 Sep 2012 by Giles Barton-Owen