• Broadcasting and Media Magazine
• /
• v.21 no.3
• /
• pp.36-45
• /
• 2016

본 고에서는 디지털 라디오 방송 수신 기술 규격인 DAB(Digital Audio Broadcasting), DAB+ 기술과 DRM(Digital Radio Mondiale), DRM+ 그리고 최신 오디오 압축 기술인 USAC(Unified Speed and Audio Coding) 코덱 기술이 적용된 디지털라디오 수신 기술을 설명하고자 한다. 이를 위해 기존의 디지털라디오 규격과 오디오 코덱 기술을 살펴보고 오디오 서비스의 품질을 높이고 주파수 효율을 증대시킬 수 있는 USAC 기술을 살펴본다. 그리고 이를 적용할 수 있는 디지털라디오 수신 기술을 제시한다. 향후 DAB+기반의 디지털라디오 수신기에 USAC 적용 가능성을 제시하며 마무리 짓는다.

• ETRI Journal
• /
• v.26 no.2
• /
• pp.149-160
• /
• 2004

In this paper, we present an interactive data broadcasting system compliant with the Advanced Television Systems Committee (ATSC) standards. The proposed system provides users not only with various data broadcasting services but also remote interactive services. For various data broadcasting services, we have adopted a synchronized data injector that calculates the transmission time of synchronized data accurately and multiplexes synchronized data with the data of an MPEG-2 audio-visual program according to the calculated transmission time. To support remote interactive services, we designed and implemented a return channel server connected on a bi-directional interaction channel. Test results show that the proposed system provides both an asynchronous and synchronized data broadcasting service and remote interactive service appropriately.

• ETRI Journal
• /
• v.26 no.2
• /
• pp.112-121
• /
• 2004

Digital Multimedia Broadcasting (DMB) is an upcoming standard in Korea used to provide mobile multimedia broadcasting service based on the Eureka-147 Digital Audio Broadcasting (DAB) system. The current dominant multimedia coding standard, MPEG-4, is foreseen to play an important role in forthcoming DMB services. However, the current approaches for transporting MPEG-4 content over DMB networks are not optimized. To address this issue we propose a novel MPEG-4 stream multiplexer, called M4SMux, which provides better stream multiplexing and delivery over DMB networks. M4SMux features an MPEG-4 elementary-stream interleaving mechanism that reduces the multiplexing overhead and a multiplex configuration mechanism that utilizes M4SLinkTable for easy content access. In addition, we propose an error correction method which enhances transport efficiency.

• ETRI Journal
• /
• v.27 no.3
• /
• pp.330-333
• /
• 2005

The Inter-Channel Level Difference (ICLD) is a cue parameter to estimate spectral information in a binaural cue coding that has been recently in the spotlight as a multichannel audio signal compression technique. Even though the ICLD is an essential parameter, it is generally distorted by quantization. In this paper, a new modified ICLE representation method to minimize the quantization distortion is proposed by adopting a flexible determination of the reference channel and the unidirectional quantization. Our experimental result confirms that the proposed method improves the multichannel audio output quality even with the reduced bit-rate.

• Journal of information and communication convergence engineering
• /
• v.6 no.3
• /
• pp.266-269
• /
• 2008

Layered structure of the Korean terrestrial Digital Multimedia Broadcasting (TDMB) transmission system for multimedia broadcasting service is presented in this paper. We made a switching module which is called the Ensemble Remultiplexer. It is designed to remultiplex the Ensemble Transport Interface (ETI) for T-DMB service. This paper describes the remultiplexing process of the Ensemble Remultiplexer.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2000.11b
• /
• pp.43-48
• /
• 2000

This paper introduces MPEG-2 AAC codec system fur digital audio broadcasting. This system consists of encoder and decoder, and this system provides MPEG-2 system multiplexing and demultiplexing functions. Four DSPs are adopted fur encoder and three DSPs fur decoder. Each DSP processes system control, I/O control, and audio signal processing, multiplexing and demultiplexing. This paper also discusses about some near future estimations related to DAB system and services. And at the end of this paper describes about future development plans.

• Broadcasting and Media Magazine
• /
• v.1 no.3
• /
• pp.51-60
• /
• 1996

• Journal of Broadcast Engineering
• /
• v.9 no.4 s.25
• /
• pp.411-423
• /
• 2004

In Korea, Eureka-147 DAB (Digital Audio Broadcasting) temporarily decided as the standard system for digital audio broadcasting was evolved into DMB (Digital Multimedia Broadcasting) to complement the technical vulnerability in mobile reception of terrestrial DTV. According to introducing video service in T-DMB (Terrestrial DMB), 'Terrestrial DMB Experimental Broadcasting for Video Service', a national project of the MIC (Ministry of Information and Communication), was done for verifying the possibility of video service via T-DMB. The main objective of the project is computing the effective field strength and coverage for making a plan to build T-DMB broadcasting network and developing transmitting and receiving equipment. In case of digital broadcasting, it is absolutely essential to measure BER (Bit Error Rate) and electric field strength in order to evaluate coverage and quality of received signal. In this paper, we implement an integrated mobile measurement system for T-DMB. For this purpose, we propose efficient data structure and algorithm for BER measurement. By adding GPS (Global Positioning System) and electric field strength measurement parts into BER measurement part, we complete the integrated mobile measurement system, and then verify it by experiments and field tests. The developed system was used in a national project, 'Terrestrial DMB Experimental Broadcasting for Video Service' and measurement results will be used as fundamental data for building T-DMB broadcasting network.

• Journal of the Korean Professional Engineers Association
• /
• v.38 no.3
• /
• pp.6-12
• /
• 2005

DMB(Digital Multimedia Broadcasting) Service was started, DMB enables people on the move to enjoy seamless video streaming, theater-quality audio and data through a hand-held digital device much like a handset or an in-car terminal. Realization of any-time, any-where, any-device, any-one DMB Service is needed for the government effective policy, Technical R&D and Standization, Corporate investment.

• ETRI Journal
• /
• v.26 no.6
• /
• pp.653-656
• /
• 2004

This paper presents an effective algorithm for inserting an MPEG-2 transport stream (TS) into a Digital Audio Broadcasting (DAB) ensemble without any bandwidth waste in a Digital Multimedia Broadcasting (DMB) transmission system. The key technologies of this algorithm include packet rate control and program clock reference correction, which are important for TS processing. The proposed algorithms are applied to the various DMB transmission systems based on Eureka-147, and the performance of the proposed algorithm is confirmed through the experimental DMB broadcasting.