Learn more about the essentials of audio test with the AP Starter Library:
THE AUDIO MEASUREMENT HANDBOOK
MEASUREMENT TECHNIQUES FOR DIGITAL AUDIO
HOW TO READ (AND WRITE) AUDIO SPECIFICATIONS
Audio Precision Audio Measurement Handbook
To Download: http://opt-in.ap.com/AP-Starter-US/
This is a good resource. I registered and downloaded the zip file which expands into pdfs.