"CD Player" joke

I wanted to buy a CD player, but was completely perplexed by one model's promotional sign. So I called the sales clerk over and asked, "What does' hybrid pulse D/A converter' mean?"He said, "That means that this machine will read the digital information that is encoded on CDs and convert it into an audio signal.""In other words," I said, "this CD player plays CDs.""Exactly."