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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Broadcast Engineering
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Journal DOI :
The Korean Institute of Broadcast and Media Engineers
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Volume & Issues
Volume 10, Issue 4 - Dec 2005
Volume 10, Issue 3 - Sep 2005
Volume 10, Issue 2 - Jun 2005
Volume 10, Issue 1 - Mar 2005
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Sparse Adaptive Equalizer for ATSC DTV in Fast Fading Channels
Heo No-Ik ; Oh Hae-Sock ; Han Dong Seog ;
Journal of Broadcast Engineering, volume 10, issue 1, 2005, Pages 4~13
An equalization algorithm is proposed to guarantee a stable performance in fast fading channels for digital television (DTV) systems from the advanced television system committee (ATSC) standard. In channels with high Doppler shifts, the conventional equalization algorithm shows severe performance degradation. Although the conventional equalizer compensates poor channel conditions to some degree, long filter taps required to overcome long delay profiles are not suitable for fast fading channels. The Proposed sparse equalization algorithm is robust to the multipaths with long delay Profiles as well as fast fading by utilizing channel estimation and equalizer initialization. It can compensate fast fading channels with high Doppler shifts using a filter tap selection technique as well as variable step-sizes. Under the ATSC test channels, the proposed algorithm is analyzed and compared with the conventional equalizer. Although the proposed algorithm uses small number of filter taps compared to the conventional equalizer, it is stable and has the advantages of fast convergence and channel tracking.
Enhanced-TCM CODEC Development for Next Generation Terrestrial DTV Transmission System
Kim Sung-Hoon ; Ji Kum-Ran ; Lee Jae-Youn ; Kim Seung-Won ; Lee Soo-In ; Kim Chang-Joong ; Lee Ho-Kyoung ;
Journal of Broadcast Engineering, volume 10, issue 1, 2005, Pages 14~21
This paper described an Enhanced-xVSB system for improving mobile/pedestrian reception performance to the ATSC(Advanced Television System Committee) DTV 8-VSB transmission standard. E-xVSB system can transmit a mixture of normal (8-VSB) stream and enhanced (robust) stream. The robust stream has a higher threshold of visibility (TOV) compared to the standard stream, and legacy receivers ignore the robust packets. Thus, Enhanced-xVSB system is fully backward compatible with a current ATSC standard. For mobile and portable reception support, E-xVSB system adopts a reduced constellation methodas well as enhanced trellis-coded modulation scheme. E-xVSB system supports a variety of enhanced modulation schemes : Pseudo-2VSB, Enhanced-4VSB, modified Enhanced-8VSB and Hybrid-VSB. Proposed E-xVSB system performs well under serious dynamic multipath reception environment.
A 3D Audio Broadcasting Terminal for Interactive Broadcasting Services
Park Gi Yoon ; Lee Taejin ; Kang Kyeongok ; Hong Jinwoo ;
Journal of Broadcast Engineering, volume 10, issue 1, 2005, Pages 22~30
We implement an interactive 3D audio broadcasting terminal which synthesizes an audio scene according to the request of a user. Audio scene structure is described by the MPEG-4 AudioBIFS specifications. The user updates scene attributes and the terminal synthesizes the corresponding sound images in the 3D space. The terminal supports the MPEG-4 Audio top nodes and some visual nodes. Instead of using sensor nodes and route elements, we predefine node type-specific user interfaces to support BIFS commands for field replacement. We employ sound spatialization, directivity/shape modeling, and reverberation effects for 3D audio rendering and realistic feedback to user inputs. We also introduce a virtual concert program as an application scenario of the interactive broadcasting terminal.
Performance Improvement of Frequency Synchronization in ATSC DTV System using Signal Power at Both Edges of Spectrum
Song Hyun Keun ; Lee Joo Hyung ; Kim Jae Moung ; Eum Ho Min ; Kim Seung Won ;
Journal of Broadcast Engineering, volume 10, issue 1, 2005, Pages 31~42
ATSC DTV system uses FPLL block for acquiring the frequency synchronization. Because the FPLL uses only the pilot signal, the frequency convergence range becomes narrower and it takes a more time to acquire the frequency synchronization as the pilot is distorted. And the spectrum shape around the pilot makes an asymmetric convergence range between the positive frequency offset and the negative frequency offset. This paper proposes the algorithm that requires the Installation of the fitters at the both edges of a VSB spectrum and uses the signal power that passes these filters. The proposed algorithm complements the problems of the asymmetric convergence range and overcomes the performance degradation due to the distortion of a pilot level.
Target Advertisement Service using a Viewer's Profile Reasoning
Kim Munjo ; Im Jeongyeon ; Kang Sanggil ; Kim Munchrul ; Kang Kyungok ;
Journal of Broadcast Engineering, volume 10, issue 1, 2005, Pages 43~56
In the existing broadcasting environment, it is not easy to serve the bi-directional service between a broadcasting server and a TV audience. In the uni-directional broadcasting environments, almost TV programs are scheduled depending on the viewers' popular watching time, and the advertisement contents in these TV programs are mainly arranged by the popularity and the ages of the audience. The audiences make an effort to sort and select their favorite programs. However, the advertisement programs which support the TV program the audience want are not served to the appropriate audiences efficiently. This randomly provided advertisement contents can occur to the audiences' indifference and avoidance. In this paper, we propose the target advertisement service for the appropriate distribution of the advertisement contents. The proposed target advertisement service estimates the audience's profile without any issuing the private information and provides the target-advertised contents by using his/her estimated profile. For the experimental results, we used the real audiences' TV usage history such as the ages, fonder and time of the programs from AC Neilson Korea. And we show the accuracy of the proposed target advertisement service algorithm. NDS (Normalized Distance Sum) and the Vector correlation method, and implementation of our target advertisement service system.
Implementation of Encoder and Decoder for TV-Anytime Metadata
Kim Myounghoon ; Kim Hyeokman ; Yang Seungjun ; Kim JaeGon ;
Journal of Broadcast Engineering, volume 10, issue 1, 2005, Pages 57~67
In the paper, we propose a TV-anytime codec that encodes and decodes TV-Anytime metadata according to the TV-Anytime specification so that the resulting binary TV-Anytime metadata can be transferred efficiently through the broadcasting network where the data bandwidth is restricted.. We describe the broadcasting environment that the TV-Anytime codec will be applied to, and the required functionalities of the software modules in detail. For the design of software modules, we show how to Implement the modules for metadata fragmentation. encoding, decoding, and the fragments management. The proposed TV-Anytime codec can be utilized as the core components to a personalized digital broadcasting system providing ECG(Electronic Content Guide) and segmentation information services according to TV-Anytime standard.
Implementation of Stereo Image Acquisition System using the Stereo Zoom Lens Module
Lee Haeng-Su ; Kwon Ki-Chul ; Kim Jung-Hoi ; Kim Nam ;
Journal of Broadcast Engineering, volume 10, issue 1, 2005, Pages 68~76
We propose a new type of stereoscopic camera system with a zoom lens module to overcome the backlash for the stability of picture matching and the difficulty of zoom control. This system is designed to control a pair of zoom lens with a rotation lever. In this paper, we present the structural characteristics of our proposed system, and verify that there are no image mismatching at acquired stereo images and the zoom in
out is easy to control. In our experiments, we achieve good results that a convergence control is very simple and distortion of images is decreased.
Highly Integrated Low-Power Motion Estimation Processor for Mobile Video Coding Applications
Park Hyun Sang ;
Journal of Broadcast Engineering, volume 10, issue 1, 2005, Pages 77~82
We propose a highly Integrated motion estimation processor (MEP) for efficient video compression in an SoC platform. When compressing video by the standards like MPEG-4 and H.263, the macroblock related functions motion compensation. mode decision, motion vector prediction, and motion vector difference calculation require the frequent intervention of MCU. Thus the proposed MEP incorporates those functions with the motion estimation capability to reduce the number of interrupts to MCU, which can lead to a highly efficient SoC system. For low-power consumption, the proposed MEP can prevent the temporally static area from motion estimation or can skip the half-pel motion estimation for those macroblocks whose modes are decided as INTRA.
Parallel Video Processing Using Divisible Load Scheduling Paradigm
Suresh S. ; Mani V. ; Omkar S. N. ; Kim H.J. ;
Journal of Broadcast Engineering, volume 10, issue 1, 2005, Pages 83~102
The problem of video scheduling is analyzed in the framework of divisible load scheduling. A divisible load can be divided into any number of fractions (parts) and can be processed/computed independently on the processors in a distributed computing system/network, as there are no precedence relationships. In the video scheduling, a frame can be split into any number of fractions (tiles) and can be processed independently on the processors in the network, and then the results are collected to recompose the single processed frame. The divisible load arrives at one of the processors in the network (root processor) and the results of the computation are collected and stored in the same processor. In this problem communication delay plays an important role. Communication delay is the time to send/distribute the load fractions to other processors in the network. and the time to collect the results of computation from other processors by the root processors. The objective in this scheduling problem is that of obtaining the load fractions assigned to each processor in the network such that the processing time of the entire load is a minimum. We derive closed-form expression for the processing time by taking Into consideration the communication delay in the load distribution process and the communication delay In the result collection process. Using this closed-form expression, we also obtain the optimal number of processors that are required to solve this scheduling problem. This scheduling problem is formulated as a linear pro-gramming problem and its solution using neural network is also presented. Numerical examples are presented for ease of understanding.
EPG User Interface based on Specifying Multiple Program Attributes
Lee Jae Hoo ; Jung Moon Ryul ;
Journal of Broadcast Engineering, volume 10, issue 1, 2005, Pages 103~118
Since the introduction of digital broadcasting, an additional advanced service called EPG has been brought to viewers. EPG (Electronic Program Guide) helps people select channels or programs. But existing user Interfaces for EPG are not convenient enough for the viewer. TV is the media anyone can access. Therefore, the 'look and feel' user interface is needed to guide the viewer to select their favorite programs without any difficulties. Generally, TV programs can be categorized by their attributes such as genre, broadcasting hours, and TV ratings. At the present moment, those attributes are not categorized systematically enough for easy program navigation. This paper presents how to organize the attributes of TV programs systematically and offers a user friendly interface to help the viewer access their favorite programs by specifying the values of the attributes in any order comfortable to them.