DTS-HD High Resolution - Similar to Dolby Digital Plus, DTS-HD High Resolution is an enhancement over standard DTS that offers higher bit rates and better compression. DTS-HD HR is also encoded as an extension to a "core" DTS track. (Note that DTS-HD HR is sometimes referred to as just "DTS-HD", which can be confusing and possibly misleading). This codec is also optional on Blu-ray, many players will only extract the 1.5 Mb/s DTS core and ignore the extension