Patent ID: 7961575

Claim:
A method of compact disk (CD) data type determination comprising the steps of: detecting CD insertion; determining if an inserted CD is a music CD or a data CD; if said inserted CD is a music CD, then assuming data on said music CD is standard audio pulse code modulation (PCM) data, and calling a CD reader for standard audio PCM data; determining if a first 4 bytes of data on said inserted CD are hexadecimal “7FFE8001” or “1FFFE800”; if said first 4 bytes of data are neither hexadecimal “7FFE8001” nor “1FFFE800”, then assuming data on said inserted CD is standard audio PCM data, and calling a CD reader for standard audio PCM data; if said first 4 bytes of data on said inserted CD are either hexadecimal “7FFE8001” or “1FFFE800”, then determining if the next byte of data is hexadecimal “3F” or “7F”; if said next byte of data is neither hexadecimal “3F” nor “7F”, then assuming data on said inserted CD is standard audio PCM data, and calling a CD reader for standard audio PCM data; if said next byte of data is either hexadecimal “3F” or “7F”, then sending data on said inserted CD to a Digital Theater Systems (DTS) decoder for playback.