This paper introduces the world’s first video and audio codec system that
complies with 8K broadcasting standards and describes transmission experiments
via a broadcasting satellite using this system.
8K Super Hi-Vision (8K) is a broadcasting system capable of highly
realistic 8K Ultra High Definition Television (UHDTV) video and 22.2
multichannel audio.
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In Japan, domestic standards for 8K broadcasting were formulated in 2014
and 8K test broadcasting began in 2016.
We have developed an 8K High Efficiency Video Coding (HEVC)/H.265 codec
system that complies with the domestic standards.
In this paper, we first explain the features and a roadmap for 8K
broadcasting.
We then introduce the features of the 8K HEVC/H.265 codec system
developed.
Finally, we describe transmission experiments using a satellite system
that is equivalent to the one that will be used in test broadcasting.
The results allowed us to confirm that the developed system provides
high-quality transmission at the expected bit rate during test broadcasting.
INTRODUCTION
An 8K Super
Hi-Vision (8K) broadcasting system capable of highly realistic 8K Ultra High
Definition Television (UHDTV) video and 22.2 multichannel (22.2 ch) audio is
currently under development.
In Japan,
domestic standards for 8K broadcasting were formulated in 2014 and 8K test
broadcasting using a broadcasting satellite will begin in 2016.
The
standards prescribe video coding, audio coding, multiplexing and transmission
schemes, and other such procedures.
Compression
of video data to a transmittable bit rate while maintaining high quality is a
key issue that must be addressed in order to realize 8K broadcasting.
A new video
coding scheme, referred to as High Efficiency Video Coding (HEVC)/H.265 (1),
was standardized in 2013.
HEVC supports
8K video formats and achieves approximately twice the compression level of the
existing Advanced Video Coding (AVC)/H.264 scheme.
Its coding
performance shows a particularly significant improvement relative to the
previous schemes for high-resolution video such as 8K.
On the other
hand, the computational cost for HEVC encoding and decoding is quite high and
is reported to be more than twice that of AVC.
This makes
realization of real-time HEVC processing challenging.
We have
developed the world’s first 8K HEVC/H.265 real-time codec (encoder and decoder)
system that complies with the domestic standards.
The system
allows 22.2 ch audio coding and video/audio multiplexing, with these functions
integrated into the video encoder and decoder.
The system
was tested by transmission experiments using a broadcasting satellite in 2015.
In this
paper, we first explain the features and a roadmap for 8K broadcasting.
We then
introduce the features of the 8K HEVC/H.265 codec system.
Finally, we
describe transmission experiments using a satellite system that is equivalent
to the system that will be used for the test broadcasts.
8K BROADCASTING
In this
section, we explain the features and a roadmap for 8K broadcasting.
8K Super Hi-Vision
8K is a TV
broadcasting system designed to deliver highly realistic 8K video and 22.2 ch
audio.
Table 1
shows the parameters for 8K and a current 2K digital broadcasting system using
a broadcasting satellite (BS) in Japan. The 8K provides much higher fidelity
than the existing broadcasting system.
Table 1
Parameters for 8K Super Hi Vision and current BS digital
broadcasting in Japan
The 8K video
format is internationally standardized in Recommendation (Rec.) International
Telecommunication Union Radio communications Sector (ITU-R) BT. 2020 (2).
Since the
number of pixels in the horizontal direction is 7,680 pixels, it is called
“8K.”
Its
characteristics are higher spatial resolution, higher frame rate, higher bit
depth, and wider color gamut than those of the existing broadcasting video formats.
The
uncompressed bit rate for the 8K/12 bit/60 Hz format is approximately 72 Gbps.
The 22.2 ch
audio format is standardized in Society of Motion Picture & Television
Engineers (SMPTE) 2036-2-2008 (3).
It is
characterized by a larger number of channels, increased sampling rate, and
larger quantization bit.
The
uncompressed bit rate for the 22.2 ch/48 kHz/24 bit format is approximately 25
Mbps.
Because of
the enormous uncompressed bit rate of 8K video, compression of the video to a
transmittable bit rate while maintaining high quality is a key issue for 8K
broadcasting.
8K Broadcasting Roadmap
In Japan, a
committee of the Ministry of Internal Affairs and Communications (MIC)
presented a roadmap for 8K broadcasting in 2014.
According to
the roadmap, 8K test broadcasting will begin in 2016 and 8K broadcasting is
planned to begin by 2018.
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Source： ibc
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