Various types of digital audio systems have been brought to the market along with the advancement in digital technology. Particularly, the popularity of portable digital audio players has been soaring today. Those players use a memory card or HDD as recording media to store music data with such high-level compression formats as MP3, WMA, or AAC. Digital audio systems are spreading into the world of not only portable audio players but also car audio equipment. Toshiba provides dedicated ICs to support those systems, and also an extensive lineup of peripheral devices.