Did you change your mind on the content of your note AFTER writing the header?
A CD player is an all-in-one. It contains both a physical transport for the disc and the laser system but also the digital-to-analog converter, or DAC. A transport contains only the first part of this.
'Redbook' is the term some of us apply to standard CDs, as opposed to hi-res CDs (HDCDs), SACDs, and DVD-As, among others. These standards literally were published in a red book, hence the name.
.