Demystified视频

A popular buzzword has been “convergence”—the intersection of various technologies that were previously unrelated. One of the key elements of multimedia convergence in the home and business has been video.
A few short years ago, the applications for video were somewhat confined—analog broadcast and cable television, analog VCRs, analog settop boxes with limited functionality, and simple analog video capture for the personal computer (PC). Since then, there has been a tremendous and rapid conversion to digital
video, mostly based on the MPEG and DV (Digital Video) standards.
Today we have:
• DVD and SuperVCD Players and Recorders.
An entire movie can be stored digitally on a single disc. Although early
systems supported composite and svideo,they rapidly added component
video connections for higher video quality.
The latest designs already support progressive scan capability, pushing the
video quality level even higher.
• Digital VCRs and Camcorders. DVCRs that store digital audio and video on tape
are now common.Many include an IEEE 1394 interface to allow the transfer
of audio and video digitally in order to maintain the high quality video and
audio.
• Digital Settop Boxes. These interface the television to the digital cable, satellite,or broadcast system. In addition, many now also provide support for interactivity, datacasting, sophisticated graphics,and internet access. Many will include DVI and IEEE 1394 interfaces to allow the transfer of audio, video, and data digitally.
• Digital Televisions (DTV). These receive and display digital television
broadcasts, either via cable, satellite, or over-the-air. Both standard-definition
(SDTV) and high-definition (HDTV) versions are available.