the equivalent of 20 bits worth of data
You've been misinformed. There's no high-res content on (regular) CDs that you could rip. They are 16Bit/44.1khz
Microsoft's HDCD which is backwards compatible with regular CDs, encodes the equivalent of 20 bits worth of data in a 16-bit digital audio signal.see:https://en.wikipedia.org/wiki/High_Definition_Compatible_Digital
one or more bits was sacrificed to encode the gain changing information.