• Title, Summary, Keyword: DAB

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Design of DAB/DAB+ Dual-mode Audio Receiver (DAB/DAB+듀얼모드 오디오용 수신기 설계)

  • Kang, Min-Goo;Lee, Jin-Woo
    • Journal of Internet Computing and Services
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    • v.10 no.5
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    • pp.33-39
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    • 2009
  • In this paper, the Window based dual-mode audio receiver of DAB and DAB+(Digital Audio Broadcasting Plus) is designed, and audio performance of it is analyzed. DAB+ can be composed of DAB and AAC(Advanced Audio Coding) for more effective audio services in the limited channel bandwidth. In the result of thesis, the Window based receiver can simultaneously be decoded for DAB/DAB+ dual-mode audio.

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Design and Implementation of a DAB Mobile for DAB Reception (DAB 수신을 위한 DAB 모바일 단말기 설계 및 구현)

  • 정상진;은성배
    • Proceedings of the Korea Multimedia Society Conference
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    • pp.855-858
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    • 2004
  • DAB(Digital Audio Broadcasting)는 음성, 동영상 및 데이터 신호를 디지털 방식으로 변조 위성 망이나 지상 망을 통해 고정 또는 휴대용 및 차량용 수신기에 제공하는 방송 서비스이며, 이동 중에도 PDA나 차량용 단말기를 통해 CD 및 DVD 급의 고음질, 고화질 양방향 데이터 신호를 주고 받을 수 있는 서비스 이다. 이에 본 논문은 모바일 단말기에서 DAB 방송을 수신하기 위해 폰과 DAB 모듈사이의 SPI 통신을 연구하며, 사용자 인터페이스 기능을 위한 메뉴를 추가하여 DAB 방송 수신이 가능하도록 디자인 한다. 결과적으로, DAB 모듈을 이용하여 차세대 서비스로 각광 받고 있는 DAB 방송을 수신 할 수 있다.

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Analysis on Protection Ratio of IBAC DAB System for Co-Channel FM Interferer (동일채널 FM 간섭원에 대한 IBAC DAB 시스템의 혼신 보호비 분석)

  • Jeong, Young-Ho;Park, So-Ra;Kim, Geon;Lee, Hyun;Lee, Soo-In
    • Journal of Broadcast Engineering
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    • v.5 no.2
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    • pp.199-210
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    • 2000
  • The IBAC (In-Band Adjacent-Channel) DAB (Digital Audio Broadcasting) system is to provide multichannel CD quality audio services and multimedia data services including text and picture in FM band (88~105 MHz). As the FM band is being used by the existing analog radio broadcasting, there must he an analysis of the interference effect between IBAC DAB and analog FM signal. Therefore, the protection ratio should be evaluated to verify the system compatibility and allocate the new IBAC DAB channel in FM band. In this paper, among the three types of interferences, FM-to-DAB, DAB-to-FM and DAB-to-DAB, that can be occurred, the Protection ratio of IBAC DAB system for co-channel FM interferer is analyzed by modeling the FM interferer and considering the multipath fading channel. The simulation results show that IBAC DAB system has far better sensitivity than Eureka 147 and needs a relatively high protection ratio for co-channel FM interferer, because of its narrow bandwidth, about one third of that of Eureka 147.

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A Study on the Successful Strategy for DAB : Focused on DAB Strategy in UK (DAB 성공전략에 관한 연구 - 영국 DAB전략을 중심으로 -)

  • Bae, Hong-Kyun
    • Korean Business Review
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    • v.18 no.2
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    • pp.133-149
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    • 2005
  • DAB is meeting with mixed success. Denmark is performing similarly to the UK thanks to the innovation of the public broadcaster but where DAB is not so strong, the problem can usually be pointed at the lack of enabling regulation. The UK's example, whilst not appropriate everywhere, has valuable lessons including licensing incentives for existing analogue commercial broadcasters and a market-building obligation on the national multiplex licensee. Despite the obvious success of DAB, it would be an omission to leave some of the continued criticisms unanswered, whether of its slow start or the underlying technology. True, there was much over-optimism in the mid-1990s, coupled with unrealistic promises and expectations of receiver pricing and consumer take-up. Governments across Europe have legislated for DAB digital radio in a variety of ways but few as successfully as the UK. It is essential that both public and private broadcasters are encouraged equally to participate in digital radio. The UK is fortunate because, for the last 10 years, there has been a progressive government policy towards digital broadcasting. The 1996 Broadcasting Act set out a full licensing regime for both digital television and digital radio. The 1996 UK legislation contained a number of key elements which have been cornerstones of its success. DAB digital radio began test broadcasting around ten years ago but it has not been a universal consumer success across Europe. In the UK, however, digital radio receivers are one of the fastest-selling consumer electronics products and sales have overtaken those of analogue radios. Why has the UK succeeded with DAB digital radio when other European countries have yet to see their markets take off? This article explains what steps the UK took to make DAB digital radio a success.

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A Performance Verification of DAB System in FM Environment (FM 환경에서 DAB 시스템의 성능 검증)

  • Kim, Tae-Huun;Cho, Byung-Lok;Oh, Kil-Nam;Jeong, Young-Ho;Park, So-Ra;Kim, Geon
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.167-172
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    • 1999
  • DAB는 기존의 아날로그 대역을 사용하게 됨에 따라 기존의 FM 방송신호의 간섭으로 수신성능의 저하가 예상된다. 본 논문에서는 FM신호의 간섭에 따른 DAB시스템의 성능저하를 SNR의 관점에서 성능평가를 하였으며, DAB와 FM신호간의 혼신보호비를 제시하였다.

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Study on the History of Printing Culture - The Center of Jin-Ju Areas - (인쇄문화사에 대한 고찰 - 진주지역을 중심으로)

  • ChuNamJang
    • Journal of the Korean Printing Society
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    • v.13 no.2
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    • pp.47-53
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    • 1995
  • Photosensitive resin of azide type is good for resolution and inner solvent, but it is really problem to development of practical use because fanctional groups of polymer has many hydrophilic radicals. By careful attention to this point, this study was investigated synthesis term, photo property and development property of composed photosensitive resin of azida type, it is to this effect. 1) H-NMR spectrum of compared DABCI showed amion redical by $\delta$6.0~6.1ppm to substitude for azide radical by amino radical by $\delta$8.9~9.45ppm, and FT-IR absorption spectra showed the absorption bends at 2100cm. 2)FT-IR absorption spectra of PHS1-DAB, PHS2-DAB, CMM-DAB and CHM-DAB showed azida radical pick to be lost at after irradiation by UV light. 3) According to exposuer change of PHS1-DAB, PHS2-DAB, CMM-DAB and CHM-DAB, absorption maximum value of UV spectrum change was 280nm. 4) to compared relative sensitivity of compared photosensitive resin, PHS2-DAB was the best and to compared insolubility rate of compared photosensitive resin, CMM-DAB was the lower. 5)Solubility if NaOH was the best by 1.0mol/$\ell$ and solubility of developing solution of ethanol to water was it in the ratio of 4 to 1.

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Protection Ratio for Eureka 147 DAB System against NTSC TV Signal Interferer (NTSC TV 간섭원에 대한 Eureka 147 DAB 시스템의 혼신보호비)

  • Jeong, Young-Ho;Kim, Geon;Yang, Kyu-Tae;Lee, Soo-In
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.223-227
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    • 2002
  • Eureka 747 DAB 시스템의 혼신보호비는 AM, FM, PAL, SECAM, DAB 등의 동일채널 및 인접채널 간섭원에 대한 조사가 수행되었으나, NTSC TV 간섭원에 대해서는 분석되지 않았다. Eureka 141 DAB 시스템 대부분이 TV 대역인 Band III에서 운용되는 상황을 고려한다면, NTSC TV 간섭원에 대한 혼신보호비 분석은 반드시 필요하다. 본 논문에서는 Eureka 147 DAB 시스템과 아날로그 NTSC TV 시스템간의 혼신보호비중 NTSC TV 간섭원에 대한 Eureka 147 DAB 시스템의 혼신보호비 측정을 위한 간섭환경 설정방법 및 DAB송수신기를 이용한 BER 측정방법, 그리고 측정결과를 제시한다.

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Performance Analysis of IBAC DAB System for Bandwidth in Korea FM Interference Environmentlevance Feedback (국내 FM 간섭환경에서 대역폭에 따른 IBAC DAB 시스템의 성능분석)

  • 조병록;김태훈;오길남
    • Journal of Broadcast Engineering
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    • v.5 no.2
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    • pp.211-219
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    • 2000
  • The IBAC DAB system was interfered by existing FM broadcasting signal as was used guardband within existing FM broadcasting. The FM interference signals are very important parameter in performance evaluation of IBAC DAB system. We got the characteristic of FM PSD in according to instantaneous change and average characteristic of FM broadcasting signal in according to characteristic of FM channel. In this paper, based on proposed IBAC DAB system, we analyze effects of FM interference for occupied bandwidth and performance of IBAC DAB modeling various FM interference signals with sum of sinusoid function using C language, suggest FM interference ratio that can maintain performance. We was know that IBAC DAB system have a great performance variation in according to average characteristic of FM PSD by simulation results, also, FM interference ration that can maintain performance of system is 10dB.

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Design and Implementation of USB Interface Bridge for PC-based DAB Receiver (PC-based DAB 수신기용 USB Interface Bridge 설계 및 구현)

  • Park, Nho-Kyung;Jin, Hyun-Joon;Park, Sang-Pong;Kim, Sang-Pok;Han, Sung-Ho;Lee, Sang-Chul
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.2A
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    • pp.90-97
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    • 2005
  • Generally, DAB systems are divided into two categories, a stand-alone type and a PC/PDA-based type. The PC/PDA-based type has less mobility comparing to the stand-alone type, nevertheless, it has the advantage of using memory, audio/video decoder, or other resources of PC/PDA. The DAB receiver implemented in this paper is a PC-based receiver system employing USB interface. The USB interface bridge is designed using FPGA and EZ-USB development kit and the implemented DAB receiver adopts the bridge and makes use of the stand-alone typed DRK-026 receiver for experiments. The USB interface bridge transforms serial data into USB packets and all of related signals are controlled by hardware logics. The operation of the implemented DAB receiver is verified by sending audio data into the PC for decoding through USB interface bridge.

Development of the EPG Provider System based on DAB (DAB 기반의 EPG Provider 시스템 개발)

  • Jin Hyun-Joon;Park Nho-Kyung;Hwang Woon-Jae
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.41 no.12
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    • pp.51-60
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    • 2004
  • DAB(Digital Audio Broadcasting) is a new media service that can provide CD quality audio, various data service, interactive and high quality mobile communications through popular media such as terrestrial broadcasting, satellite, cable TV, and internet. In this paper, a new EPG(Electronic Program Guide) application model is proposed. The model is based on DAB and combines a DAB receiver and PCs so that it can take advantages of using various multimedia services and plenty of internet contents. The developed EPSD(EPG Provider System on DAB) has Web-based Server/Client structure and povides EPG functionalities to client PCs over internet. Therefore, the DAB receiver can be smaller and cheaper, and can develop abundant data services on internet. It can also provide high quality video services and be expected to become an important component in future home network systems.