Digital Tuner Cards
These cards are used to record off the new digital television broadcast systems. The video is compressed by the broadcaster, and the card outputs audio and video multiplexed in an MPEG2 transport stream.
This standard is primarily used in North America, and consists of MPEG2 video with AC3 audio.
This standard is used throughout Europe, Asia, and Australia. Video can be MPEG2 or H.264, and audio AC3 or AAC.
This standard is primarily used in Japan and South America.