Calling this book an update is like saying you're going to update your car by buying a 1974 Holden Torana. This book was published in 1997, so it's limited to describing 1996 technology, no S/PDIF, AES/EBU, SDI, etc. The URL given in the book for the update website no longer exists. It is also very very basic, it looks at each piece of technology from a black box, user perspective - talking more about what it does than how it does it. If you really have no idea how the weatherman makes it from the studio into your home, then buy this book.