Broadcast Technical Research Institute

Seoul, South Korea

Broadcast Technical Research Institute

Seoul, South Korea
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Choi S.,Technical Research Institute of Korean Broadcasting System | Lee M.,KAIST | Jung B.,Broadcast Technical Research Institute | Ahn K.,Kyung Hee University | And 3 more authors.
SMPTE Motion Imaging Journal | Year: 2015

The quality of digital content has become increasingly significant in digital broadcasting systems. These days, consumers react to even subtle defects in media content, which, in turn, influence consumer satisfaction about the content. The development of digital broadcasting technology has replaced tape-based content with file-based content. Nonetheless, in the process of generating file-based content, people are often confronted with different types of errors. Detecting such errors and fixing them require a substantial amount of time and human labor, whereas being unable to fix them might lead to broadcast failure. Therefore, in this paper, we introduce an automated restoration system that reduces intensive human labor in fixing errors in the content generating process. Our automated video restoration system can be applied to different types of classic errors. We developed several customized algorithms to restore each error in the digital content derived from the Korean Broadcasting System video archives. Implementing our method as a familiar tool for content producers is also a consideration. We are developing the restoration system as a plug-in to a well-known nonlinear editing system. © Copyright 2014 IBC.


Suh Y.-W.,Broadcast Technical Research Institute | Suh Y.-W.,Yonsei University | Park S.I.,Electronics and Telecommunications Research Institute | Lee J.,Broadcast Technical Research Institute | And 2 more authors.
IEEE Transactions on Consumer Electronics | Year: 2010

This paper presents a receive power analysis system for DTV broadcasting networks. This system measures the receive power and channel information simultaneously, analyzes the receive power of the measured multipath components and constructs 360 degree receive power profile by repeating analysis in all antenna directions. The proposed receive power analysis algorithm is proved by laboratory tests with two distributed translators. Field test results are briefly introduced and discussed for the evaluation of the proposed system 1. © 2006 IEEE.


Suh Y.-W.,Broadcast Technical Research Institute | Suh Y.-W.,Yonsei University | Park S.I.,Electronics and Telecommunications Research Institute | Mok H.-K.,Broadcast Technical Research Institute | And 3 more authors.
IEEE Transactions on Broadcasting | Year: 2010

In this paper, a design method for a distributed translator network considering the equalization window of commercial receivers is presented and compared with the field application results with three distributed translators in an urban area of Seoul, Korea. Proper transmission timing to minimize pre-ghost can be derived from the proposed design method. With designed timing information and the measured TxID (Transmitter Identification) information, the transmission timings of translators can be adjusted. Three types of receivers with different chipset generations were used for this field test. Several combinations of translators were applied for the analysis of the effect of operating multiple translators. Field test results are analyzed and discussed for the evaluation of the target distributed translator network and its design method. © 2010 IEEE.


Kim D.,University of Wisconsin - Milwaukee | Shin H.,University of Wisconsin - Milwaukee | Oh J.,Broadcast Technical Research Institute | Sohn K.,Yonsei University
Journal of Electronic Imaging | Year: 2010

We present a novel method for automatically correcting the radial lens distortion in a zoom lens video camera system. We first define the zoom lens distortion model using an inherent characteristic of the zoom lens. Next, we sample some video frames with different focal lengths and estimate their radial distortion parameters and focal lengths.We then optimize the zoom lens distortion model with preestimated parameter pairs using the least-squares method. For more robust optimization, we divide the sample images into two groups according to distortion types (i.e., barrel and pincushion) and then separately optimize the zoom lens distortion models with respect to divided groups. Our results show that the zoom lens distortion model can accurately represent the radial distortion of a zoom lens. © 2010 SPIE and IS&T.


Jeon S.,Broadcast Technical Research Institute | Choi J.-Y.,Yonsei University | Yim Z.,Broadcast Technical Research Institute | Seo J.-S.,Yonsei University
IEEE Transactions on Broadcasting | Year: 2012

This paper provides numerical results for proving the performance gain afforded by signal space diversity (SSD). First, we derive the exact distribution of Bernoulli-χ 2 product random variables in order to obtain the average bit error rate (BER). Then, to attain the asymptotic error floor of the average BER, the Chernoff upper bound and the moment generating function of the Bernoulli-χ 2 distribution are adopted. As a consequence, we confirm the accuracy of our analysis by simulations, and prove that BER without SSD converges to 2, whereas when SSD is used, it converges to p2/2 regardless of the modulation type and order when the erasure probability is equal to p over both Rayleigh and Rician fading channels. © 2012 IEEE.


Yim Z.,Broadcast Technical Research Institute | Jeon S.,Broadcast Technical Research Institute
IEEE Transactions on Broadcasting | Year: 2011

In this paper, we derived the exact formula for the normalization factor of both B-mode and Q-mode hierarchically modulated symbols of the advanced terrestrial digital multimedia broadcasting (AT-DMB) system. This factor is required to scale the average energy of the transmit symbol to one. After investigating the average energy of hierarchically modulated symbols in AT-DMB, we formulate the normalization factor as a term of the constellation ratio. Based on this normalization factor, we have verified the effect after normalization on bit error rate (BER) performance. © 2010 IEEE.


Lee J.,Broadcast Technical Research Institute
IEEE International Symposium on Broadband Multimedia Systems and Broadcasting 2010, BMSB 2010 - Final Programme | Year: 2010

It is well known that high power amplifier (HPA) induces nonlinear distortion around its saturation region. It causes the inter-modulation distortion (IMD) and spectrum re-growth problems. Thus, the digital pre-distortion (DPD) technique is used to improve the linearity of HPA. This paper proposes the adaptive DPD technique, which is composed of a look-up table (LUT) based adaptive update algorithm, for the compensation of HPA nonlinearity. From the simulation results, the proposed technique shows the better convergence speed and spectrum re-growth suppression compared with conventional LUT technique.


Hwang S.U.,Yonsei University | Jeon S.,Broadcast Technical Research Institute | Choi J.,Yonsei University | Seo J.,Yonsei University
IEEE International Symposium on Broadband Multimedia Systems and Broadcasting 2010, BMSB 2010 - Final Programme | Year: 2010

The spatial modulation (SM) divides input data into antenna indices and data symbols, and transmits data symbols via the specific antenna chosen by an antenna index. The performance of SM is affected by the worse one between the detection performances of antenna index and data symbol. In this paper, power efficient SM based transmitter and receiver architectures are proposed in order to provide different protection levels according to the important level of data, and also to improve the receive performance as compared with the conventional SM. To provide unequal error protection (UEP) at the transmitter, the antenna index and data symbol are separately encoded by two FEe codes. At the receiver, the two-stage detection and decoding based on a novel criteria is applied in order to enhance the bit error rate (BER) performance. Simulation results show that the proposed scheme outperforms the conventional SM over frequency selective channels.


Jeon S.,Broadcast Technical Research Institute | Lee J.,Broadcast Technical Research Institute | Kyung I.,Broadcast Technical Research Institute | Kim M.-S.,Broadcast Technical Research Institute
IEEE International Symposium on Broadband Multimedia Systems and Broadcasting 2010, BMSB 2010 - Final Programme | Year: 2010

A signal space diversity (SSD) scheme combined with Alamouti coding is investigated to achieve more diversity gain in fading channels. By approximating noise as a Gaussian distribution after Alamouti decoding, an exact expression for the SER for SSD schemes with Alamouti coding in Rayleigh fading channels can be derived for 4-QAM and 16-QAM. Using the formula derived by using upper bound approach, it can be confirmed that the diversity order is 4MR, where 2 stems from SSD and 2MR from Alamouti coding with receive MRC. Numerical evaluation performed using the formula developed for evaluating performance under various conditions indicated that the rotation angle affects the performance; this numerical evaluation had low computational complexity.


Lee D.,Broadcast Technical Research Institute
International Conference on Advanced Communication Technology, ICACT | Year: 2010

The viewer's behavior of contents consumption is changing from passive to active due to the progress of internet. Since the television is able to support some sort of restricted internet service through digital television and internet technology, the TV broadcasters can respond the viewer's active behavior. In Korea, TV broadcasters prepare OHTV(Open Hybrid TV) service which combines terrestrial DTV and internet together for the analog TV switch off in 2012, providing terrestrial DTV viewers with various contents and bidirectional interactive service. Also, broadcasters and TV manufacturers cooperate to make OHTV standard in authorized standardization organization for equivalent marketing opportunity.

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