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Virtual Surround Sound - VSS technol- ogy employs advanced algorithms to simulate surround sound from stereo speakers in one of two ways. For discs with multi-channel audio (such as Dolby Digital AC-3), the audio sig- nal is converted into a two-channel signal in such a way as to retain a surround sound effect. For discs with stereo sound, the audio is enhanced to simulate surround sound. The result is a highly realistic, more true- to-life, and involving entertainment experience for movies and music.
WMA (Windows Media Audio) - Microsoft's proprietary audio codec designed to compete with MP3. Claims competitive sound quality at lower bit rates.