The EZURiO Winbond Codec Evaluation Board  plugs into the EZURiO Developers kit and allows you to rapidly test and evaluate  Bluetooth audio applications using the EZURiO  Bluetooth Intelligent Serial Module to implement the wireless link. 
 
The ACC-005 evaluation board is based on the Winbond W681360 codec - a 3V, single  channel, 13 bit linear voice-band codec, which is pin compatible to the Motorola MC145483.   The codec is used to digitize incoming audio from the microphone into PCM data and convert  the PCM digital audio output of the  Bluetooth chip into an analogue signal for the headphones. The codec board has a microphone input and headphone output which are compatible with standard PC headsets.
 
The W681630 codec has several features such as power down mode and high pass filter disable (to allow frequencies down to DC to be used). The ACC-005 codec evaluation board provides options to allow these features to be tested.
 
The W681360 incorporates a feature that allows the volume of the codec output to be digitally controlled via 3 bits of the PCM data stream. The BISM II provides an AT command (ATS589) that allows you to control the volume of the codec. 
 
This document provides you with information to prototype and evaluate your own audio application. Once you have tried out your application, you will be able to design your own audio solution based around the Winbond codec and the EZURiO Bluetooth Intelligent Serial module.