CD-ROM/XA,

(seen Yellow Book) with the help of Philips, Sony, and Microsoft gave CD-ROM/XA certain traits found on CD-i discs. CR-ROM/XA, also known as the "bridge disc" contained interactive capabilities, as well as a specific form of audio compression known as (ADPCM). CD-ROM/XA was to describe a standard means for making multimedia data access more efficient, especially for PC's. Interleaving audio and video data allows for better synchronization upon playback.