[opendtv] ATSC Adopts Standard for Advanced Video Coding
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 22 Sep 2008 11:50:53 -0700
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John Willkie
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ATSC ADOPTS STANDARD FOR ADVANCED VIDEO CODING
Video compression, which reduces the bandwidth required to transport a
digital video signal, was one of the key technologies that enabled the
development of digital television (DTV). The state-of-the-art for video
coding technology in the early 1990s was MPEG-2, and this became a
fundamental part of the Advanced Television Systems Committee (ATSC)
standard, as well as DTV standards in other parts of the world. The vast
majority of DTV receivers worldwide, including many millions in the United
States, now decode MPEG-2 video.
Due to "Moore's Law," the processing speed and memory capacity of hardware
devices for video encoding and decoding has advanced greatly since MPEG-2
was developed. This has enabled increasingly sophisticated compression
algorithms to be developed that take advantage of the increased hardware
power now available at ever-lower price points. These new video
encoding/decoding (codec) systems provide significant improvements in coding
efficiency compared to MPEG-2 and can result in equivalent or better quality
at lower bit rates. However, none of the new advanced codecs are
backward-compatible with MPEG-2, which creates a challenge for their
introduction into existing broadcast systems.
One of the new codecs that is receiving wide acceptance in deployment of new
video services is Advanced Video Coding (AVC) and last week the ATSC
published a standard to enable the use of AVC for ATSC DTV. One of the
reasons for adding AVC to ATSC is that several countries that still have to
decide on the DTV transmission standard to be adopted have asked for
advanced codec capability, and this is needed for ATSC to be competitive
with alternative systems under consideration. In the United States, AVC is
unlikely to be used in the near future for regular DTV broadcasting because
the large installed base of MPEG-2 integrated receivers and set-top boxes in
this country would be unable to decode such programming. As mentioned in the
ATSC press release (see below), standards for new mobile/handheld (M/H) and
non-real-time (NRT) services are now being developed in ATSC that, by their
nature, would require new receiver devices. These are obvious candidates to
take advantage of the improved efficiency of AVC. In fact, a high-efficiency
advanced codec is virtually essential for the M/H standard in order to
preserve adequate DTV channel bandwidth for existing MPEG-2 services.
In their press release on AVC, for the first time in public, the ATSC refers
to "ATSC 2.0." This concept for next generation services for fixed receivers
is part of the ATSC long-term strategic plan for the future of DTV. ATSC 2.0
is currently in the development stage in the ATSC Planning Committee,
chaired by NAB Science & Technology staff member Graham Jones, and is a
separate effort from the mobile/handheld standard now in preparation.
Various new capabilities are envisioned for ATSC 2.0, which is expected to
trigger a new generation of receivers potentially including AVC.
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MyZsaT00NDU3MzI/index.html> "WASHINGTON, September 2008 - The Advanced
Television Systems Committee, Inc. has approved and published A/72 which
details the methodology to utilize Advanced Video Coding (AVC) within an
ATSC DTV transmission. AVC, which was developed by the ITU-T Video Coding
Experts Group together with the ISO/IEC Moving Picture Experts Group, is
also known as H.264 and MPEG-4 Part 10. The A/72 Standard defines
constraints with respect to AVC, compression format restraints, low delay
and still picture modes, and bit stream specifications. In addition it
specifies how CEA-708 closed captions are to be carried in an AVC bit
stream. The new standard is in two parts, Part 1 is titled "Video System and
Characteristics of AVC in the ATSC Digital Television System," and "Part 2"
AVC Video Transport Subsystem Characteristics."
"AVC compression provides increased efficiency and flexibility", said ATSC
President Mark Richer. "The new standard will be especially important for
those countries which have not yet implemented digital television. AVC will
also be used with standards in development such as ATSC-M/H for mobile and
handheld applications and ATSC-NRT for non-real-time delivery of
programming."
The Advanced Television Systems Committee is an international, non-profit
organization developing voluntary standards for digital television. The ATSC
member organizations represent the broadcast, broadcast equipment, motion
picture, consumer electronics, computer, cable, satellite, and semiconductor
industries. ATSC creates and fosters implementation of voluntary Standards
and Recommended Practices to advance terrestrial digital television
broadcasting, and to facilitate interoperability with other media.
ATSC-M/H is being developed to support a variety of services including free
(advertiser-supported) television and interactive services delivered in
real-time, subscription-based TV, and non-real-time content download for
playback at a later time. The standard may also be used for transmission of
new data broadcasting services such as real-time navigation data for
in-vehicle use.
ATSC-NRT addresses the new reality that consumers are increasingly in
control and want information and entertainment content, when and where they
want it. By leveraging the low cost of storage in receivers, broadcasters
utilizing the ATSC-NRT Standard will be able download content to a new
generation of products.
ATSC-2.0 will define a complete suite of "Next Generation" services for the
conventional fixed DTV receiver viewing environment."
The A/72 standard is available for download at:
http://www.atsc.org/standards/a72.php
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