/** \file
 *
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/** \mainpage Audio Input Device Demo
 *
 *  \section SSec_Compat Demo Compatibility:
 *
 *  The following list indicates what microcontrollers are compatible with this demo.
 *
 *  - Series 7 USB AVRs
 *  - Series 6 USB AVRs
 *  - Series 4 USB AVRs
 *
 *  \section SSec_Info USB Information:
 *
 *  The following table gives a rundown of the USB utilization of this demo.
 *
 *  <table>
 *   <tr>
 *    <td><b>USB Mode:</b></td>
 *    <td>Device</td>
 *   </tr>
 *   <tr>
 *    <td><b>USB Class:</b></td>
 *    <td>Audio Class</td>
 *   </tr>
 *   <tr> 
 *    <td><b>USB Subclass:</b></td>
 *    <td>Standard Audio Device</td>
 *   </tr>
 *   <tr>
 *    <td><b>Relevant Standards:</b></td>
 *    <td>USBIF Audio Class Specification \n
 *        USBIF Audio Class Terminal Types Specification \n
 *        USBIF Audio Data Formats Specification</td>
 *   </tr>
 *   <tr>
 *    <td><b>Usable Speeds:</b></td>
 *    <td>Full Speed Mode</td>
 *   </tr>
 *  </table>
 *
 *  \section SSec_Description Project Description: 
 *
 *  Audio demonstration application. This gives a simple reference
 *  application for implementing a USB Audio Input device using the
 *  basic USB Audio drivers in all modern OSes (i.e. no special drivers
 *  required).
 *  
 *  On start-up the system will automatically enumerate and function
 *  as a USB microphone. Incoming audio from the ADC channel 1 will
 *  be sampled and sent to the host computer.
 *  
 *  To use, connect a microphone to the ADC channel 2.
 *  
 *  Under Windows, if a driver request dialogue pops up, select the option
 *  to automatically install the appropriate drivers.
 *
 *  \section SSec_Options Project Options
 *
 *  The following defines can be found in this demo, which can control the demo behaviour when defined, or changed in value.
 *
 *  <table>
 *   <tr>
 *    <td><b>Define Name:</b></td>
 *    <td><b>Location:</b></td>
 *    <td><b>Description:</b></td>
 *   </tr>
 *   <tr>
 *    <td>MICROPHONE_BIASED_TO_HALF_RAIL</td>
 *    <td>Makefile CDEFS</td>
 *    <td>When defined, this alters the demo so that the half VCC bias of the microphone input is subtracted.</td>
 *   </tr>
 *   <tr>
 *    <td>AUDIO_SAMPLE_FREQUENCY</td>
 *    <td>Descriptors.h</td>
 *    <td>Gives the audio sample rate per channel for the audio stream, in Hz.</td>
 *   </tr>
 *  </table>
 */
