Digital Multimedia Broadcasting Service Research Articles

Error Sensitivity Analysis of DMB Transport Streams

In this paper, we examine the sensitivity of the digital multimedia broadcasting (DMB) MPEG-2 transport stream (TS) format to transmission errors. To find the sensitivity of different parts of TS packets to transmission errors, each TS packet is divided into four cells, i.e., the first three cells comprising 48 bytes each and the last cell is of 44 bytes length. Bit errors are then introduced into these different parts of the TS packets. The sensitivity of DMB videos to transmission errors and their locations is assessed in terms of the following measures: 1) Number of decoder crashes; 2) Number of decodable videos; 3) Total number of decodable frames; and 4) Objective perceptual video quality of the decoded videos. The structural similarity index and visual information fidelity criterion are used as objective perceptual quality metrics. Simulations are performed on seven different DMB videos using various bit error rates. The results show that the first cell of the TS packets is highly sensitive to bit errors compared to the subsequent three cells, both in terms of spatial and temporal video quality. Further, the sensitivity decreases from Cell 1 to Cell 4 of a DMB TS packet. The error sensitivity analysis reported in this paper may guide the development of more reliable transmission systems for future DMB systems and services. Specifically, the insights gained from this study may support designing better error control schemes that take the sensitivity of different parts of DMB TS packets into consideration.

Transparent antenna using a μ‐metal mesh on the quarter glasses of an automotive for DMB service receiving

AbstractThis study aims to design a transparent antenna that operates at a digital multimedia broadcasting (DMB) service band (174‐216 MHz) for an automotive (Hyundai K5). The transparent antenna designed on the quarter glasses located on both sides of an automotive to avoid space limitation typically placed in a roof‐mounted shark‐fin. Moreover, the use of a micro‐metal mesh film (μ‐MMF) enables the antenna to minimize visual perception and size consideration through its transparency. Two types of transparent antennas (inverted F antenna; Case1 and top‐loading inverted F; Case 2) are designed, fabricated, and measured. The transparent antennas have an average peak gain of 13.2 dBi for the inverted F antenna and 12.54 dBi for the top‐loading inverted F in the overall DMB service band. The receiving RF power (dBm) of the antenna on the quarter glasses is compared for the reliability of the signal reception in two separate locations. The power level has a difference of less than 3 dBm by location and direction.

Consumer adoption in digital multimedia broadcasting: examining socio-cultural and economic determinants

This study aims to develop the persuasive theory model in explaining the adoption of digital multimedia broadcasting (DMB). DMB services were unveiled in Korea on December 1, 2005, marking the beginning of a full-fledged mobile TV era for the country. I established hypothesis under the objectives of study such as which factors can explain customers' adoption most properly and how it can be structured based on expanded technology acceptance model (ETAM). The results are threefold. First, the applicability of technology acceptance model (TAM) based on research of Davis (1989), was revealed to be supported. Second, two factors, socio-cultural influence (SCI) and network externalities, were derived as the external factors that can expand TAM in explaining adoption of DMB. Finally, results support use of the extended TAM as an explainer in the context of DMB adoption as information technology (IT).

A model of adoption of digital multimedia broadcasting (DMB) service: Comparisons in Korea, Japan, and Germany

AbstractRecently launched in a limited number of countries, digital multimedia broadcasting (DMB) is a brand new mobile service that uses the most advanced IT technology. Analyzing data collected from Korea, Japan, and Germany, this study investigates the relationship between attitudes, and their antecedents, toward using a DMB service and the intention of using it. Results of the study indicate that permanent access, entertainment, and social interaction have a positive influence on attitudes toward using DMB, and that those attitudes positively influence consumers' intention to do so, as do self‐efficacy and consumer perceptions of DMB as an innovation. Some differences in consumer behavior toward DMB service were also found among the three countries. From these findings, practical implications are drawn. © 2008 Wiley Periodicals, Inc.

A New Coeff-Token Decoding Method With Efficient Memory Access in H.264/AVC Video Coding Standard

In general, a large amount of memory accesses are required for context-based adaptive variable-length coding decoding in H.264/AVC standard. It is a serious problem for applications such as videophone and digital multimedia broadcasting services because of the considerable power consumption of the memory access function. In order to reduce the memory access, we carefully examined the codewords in variable-length code tables (VLCTs) of the coeff-token and found some distinctive features from the structure of codewords. Based on the features, a new coeff-token decoding method with an efficient memory organization is proposed in this paper. The simulation results show that the proposed algorithm achieves an approximately 95% memory access saving without video-quality degradation, compared with conventional decoding

Market analysis for the next‐generation mobile communications (DMB) service from the perspective of innovation adoption and diffusion

AbstractThis study examines market acceptance for the satellite digital multimedia broadcasting (DMB) service, one of the touted new business models in Korea's next‐generation mobile communications service market, using adoption and diffusion of innovation as the theoretical framework. Market acceptance for the satellite DMB service was assessed by predicting the demand of the service using the Bass model, and the demand variability over time was then analysed by combining the innovation adoption model proposed by Rogers (Diffusion of Innovations (5th edn). The Free Press: New York, 2003). In our estimation of the Bass model, we derived the coefficient of innovation and the coefficient of imitation using actual diffusion data from the mobile telephone service market. We also reorganized the demand data along the diffusion timeline according to Rogers' innovation adoption model, using the responses by survey subjects concerning their respective projected time of adoption. The demand prediction model revealed that diffusion for both took place forming a classical S‐curve. Concerning variability in demand for the satellite DMB service, our findings, much in agreement with Rogers' view, indicated that demand was highly variable over time and depending on the adopter group. This study, as an attempt to measure the market acceptance for the satellite DMB service, a leading next‐generation mobile communications service product, stands out from related studies in that it estimates the nature and level of acceptance for specific customer categories, using theories of innovation adoption and diffusion and survey results conducted through one‐to‐one interviews. The findings and theoretical application procedures provide practical insights into further research on market analysis of new mobile communications service‐related products. Copyright © 2007 John Wiley & Sons, Ltd.

Empirical findings on the perceived use of digital multimedia broadcasting mobile phone services

PurposeThe purpose of this study is to present an overview of digital multimedia broadcasting (DMB) and to explore the users' perception on DMB cellular phone or “cellevision”, video‐on‐the‐go services that deliver television to cell phones.Design/methodology/approachThis two‐phase study explores users' reactions to DMB contents and services, users' perceptions on the pricing of DMB phone handsets, phone usage time, program contents, and DMB carrier services. Findings from the use of qualitative method of existential phenomenology were explored further with quantitative analyses including T‐test, ANOVA, and Duncan test.FindingsThe young generation will be a major impact on the DMB market due to their mindset and lifestyle. Thus, the DMB market strategy should be to base decisions on reaching out and focusing on the younger generation (especially, the teens) as the latest trendsetters.Research limitations/implicationsThe sample size was collected during the experimental/trial stages of satellite DMB services. This research should be continued to solidify findings with an increased sample size of respondents collected during the actual stage of satellite‐DMB and terrestrial‐DMB services.Practical implicationsThe findings from this exploratory research will be valuable for the DMB service and content providers to gain insight into various age groups and their perceptions.Originality/valueThis study is the first kind of research in this area. With the study as a forerunner, the authors examined the effect of DMB mobile phone program contents and services on users.

모바일 장치에서 DMB용 MPEG-4 컨텐츠 저작

DMB에 대한 연구가 활발하게 전개되고 있고, 멀티미디어 컨텐츠에 대한 수요도 나날이 증가되면서 PC에서뿐만 아니라 언제 어디서나 가능한 모바일 디바이스에서 DMB 방송을 위한 대화형 멀티미디어 컨텐츠 저작이 필요하다. 제안하는 저작시스템은 모바일 디바이스의 이동성을 감안하여 단독저작뿐만 아니라 여러 클라이언트들과의 공동 저작이 가능하다. 따라서 DMB 방송 중에서 BIFS 정보에 대한 디코딩 시간으로 인한 지연을 극복하기 위하여 보다 가볍고 동적인 BIFS 정보 생성 기법에 대하여 설명하고 그 개발 결과를 보인다. Recently, research started to focus on Digital Multimedia Broadcasting(DMB), while the DMB service is already being launched to provide high quality audio, video and data broadcasting in Korea. Therefore, the demand for multimedia contents is also rose very sharply. In this paper, we introduced an MPEG-4 contents authoring system with mobile device for Digital Multimedia Broadcasting. Our system allows both single-handed and collaborative authoring modo. Further more, to overcome the delaytime for decoding the BIFS information, we also introduced an efficient algorithm to generate dynamic and light BIFS information.

Design and Implementation of the Ensemble Remultiplexer for DMB Service Based on Eureka-147

A new transmission system is necessary for the Digital Multimedia Broadcasting (DMB) service in Korea. Therefore, in this paper, we propose a new architecture for the implementation of a DMB transmission system based on Eureka-147. We describe the design and implementation of the Ensemble remultiplexer, which is essential to the proposed system for remultiplexing ETI frames and MPEG-2 transport streams. The proposed system provides a solution with high flexibility and low cost for multimedia broadcasting service. The functions of this transmission system have been verified by using our DMB receiver and other related systems.

A Framework for MPEG-4 Contents Delivery over DMB

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.