• Journal of Advanced Navigation Technology
• /
• v.14 no.1
• /
• pp.33-40
• /
• 2010

In this paper, the bit-error-ratio (BER) performances of Digital Radio Mondiale Plus (DRM+) system which stand for the European standard to bring analogue FM radio to digital radio in Band-II(30-170 MHz) are evaluated under multipath fading channel models used in Band-II and the adjacent channel interference (ACI) caused by FM signal. From the simulation results, the DRM+ system shows robust performances under time-varying channel environments even though the speed of a vehicle is equal to 300km/h. And it is shown that the frequency diversity, determined by delay spread of multipath fading channel, increases the coding gain of the DRM+ system with an increase of delay spread. In addition, to guarantee the BER performance of 10-4 for DRM+ system with ACI due to FM signal, the simulation results show that the desired signal-to-ACI power ratio must be more than -30 dB when the carrier frequency distance is 150 kHz.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2012.05a
• /
• pp.765-768
• /
• 2012

본 논문에서는 USB형 DRM(Digital Radio Mondiale) 디지털라디오 수신기의 수신신호 성능 검사를 위한 DRM 수신 모니터링의 응용 S/W의 설계를 통한 수신 시스템의 신호를 분석함으로서 DRM30/DRM+신호를 수신하여, RF 상태 분석, 복조와 관련된 파라메터 확인, 오디오 서비스 정보 확인 및 오디오 재생, 텍스트 활용위한 데이터 표현, GPS 위치 정보 수신이 가능한 통합모듈 응용 S/W를 제안하고자 한다.

• ETRI Journal
• /
• v.30 no.4
• /
• pp.565-575
• /
• 2008

As networks increase and cross-convergence occurs between various types of devices and communications, there is an increasing demand for interoperable service in the business environment and from end users. In this paper, we investigate interoperability issues in the digital rights management (DRM) and present a practical framework to support interoperability in environments with multiple devices. The proposed architecture enables end users to consume digital content on all their devices without awareness of the underlying DRM schemes or technologies. It also enables DRM service providers to achieve interoperability without costly modification of their DRM schemes.

• Digital Contents
• /
• no.7 s.146
• /
• pp.32-39
• /
• 2005

디지털콘텐츠 시장의 확대와 더불어 DRM 적용에 대한 요구가 증가함에 따라 DRM 솔루션 시장 역시 동반 상승세를 타고 있다.DRM은 디지털콘텐츠 유통, 상업성에 대한 완전성을 보장할 것이라는 기대감 때문이다. 아직 유료화 시장이 완전히 정착되지 않아 관련업체들의 수익은 미비한 편이고 그 규모 또한 영세하지만 향후 높은 성장률이 예상된다는 데는 이견이 없다. 관련업계에 따르면 그간 냅스터, 소리바다 등 음원 시장을 중심으로 여러 공방전이 펼쳐지고 인식의 전환이 이뤄지면서 DRM 시장도 이제 어느정도 안정화 단계에 접어들고 있는 것으로 보인다. 업계 한 전문가는“지금까지가 기술개발 및 시장 형성의 과도기였다면 올해 는 인식 전환에 따른 DRM 기반 상용서비스가 봇물을 이뤄 시장 활성화 원년이 될 것”이라고 내다봤다. 이처럼 콘텐츠 유료화에 대한 인식 제고, 디지털멀티미디어방송(DMB) 등 신규 콘텐츠 생성, 기업 내 기밀문서에 대한 보안의 중요성이 증대되면서 올해 국내 DRM 솔루션 시장 규모는 지난해보다 30% 성장한 600억원대를 형성할 전망이다. 특히 올해는 업체들이 개인정보보호법이 발효된 일본을 위시한 해외시장 판로가 열리면서 더 큰 신장세가 예고되고 있다. 관련업체들은 시장을 선점하기 위한 사업다각화에 나서고 있고 앞으로의 비즈니스 모델 개발에 매진하고 있다.

• 한국정보통신설비학회:학술대회논문집
• /
• 2008.08a
• /
• pp.125-128
• /
• 2008

In this paper, the Transport Protocol Experts Group(TPEG) transmission and reception system based on Digital Radio Mondiale(DRM) is implemented for traffic information services. DRM stands for the European radio broadcasting standard to bring AM radio into digital radio, designed to work at frequencies below 30MHz. DRM can offer various data services such as text messages and a slide show service as well as audio services. In spite of low datarate, the TPEG system on DRM has an advantage that the traffic information service system for whole country can be established because DRM can offer wider service ranges than terrestrial-digital multimedia broadcasting(T-DMB) and simply archive a single frequency network.

• 한국정보통신설비학회:학술대회논문집
• /
• 2008.08a
• /
• pp.257-261
• /
• 2008

The Digital Radio Mondiale (DRM) system is a digital broadcasting standard designed for use in the LF, MF and HF bands of the broadcasting bands below 30 MHz. The system provides both superior audio quality and improved user services / operability compared with existing AM transmissions. In this paper, we propose a variable point Prime Factor FFT design method for Digital Radio Mondiale (DRM) system. Proposed method processes a various size IFFT/FFT of Robustness Mode on DRM standard efficiently by composing Radix-Prime Factor FFT Processing Unit of form similar to Radix-4 by insertion of a variable Prime Factor Twiddle Factor and Garbage data. So, we improved limitation that cannot process 112/176/256/288 FFT of each mode of DRM system with a existent Radix Processor and increase memory size and memory access time for IFFT/FFT processing by software processing in case of implementation with a existent high speed DSP.

• Journal of the Institute of Electronics Engineers of Korea CI
• /
• v.46 no.3
• /
• pp.50-56
• /
• 2009

Recently, according to the product variety of multimedia content some problems are occurred as like an illegal copying, an illegal distribution and a copyright infringement etc. So, for the solution of these problems, some methods were proposed as like watermarking which inserts the information of copyright to the content and the cipher for authentication to DRM which prevents an illegal copying using RSA. In this paper, the multimedia fingerprint based on BIBD code is inserted to the bit-plane of the image content for DRM with RSA, and while the decoding processing. The experiment is operated with the consideration of the image transmission and the transformation. As a result it confirmed that the multimedia fingerprint code inserted in image is detected 60% upper at AWGN 7dB and detected completely 100% at AWGN 10dB upper on PSNR 30, 40, 70 and 80 of Stirmark attacks.

• IEMEK Journal of Embedded Systems and Applications
• /
• v.3 no.4
• /
• pp.235-243
• /
• 2008

In this paper, a software-based Digital Radio Modiale(DRM) receiver is implemented on a Digital Signal Processor(DSP). DRM stands for the European radio broadcasting standard to bring AM radio into digital radio, designed to work at frequencies below 30MHz. DRM can offer various data services such as text messaging and slideshow services as well as audio services. The DRM receiver implemented on the Tensilica DSP core performs well at low signal strength indication of -102dBm.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2011.11a
• /
• pp.23-24
• /
• 2011

아날로그 TV의 디지털화와 마찬가지로 아날로그 라디오 방송의 디지털화도 세계적인 추세이다. DRM(Digital Radio Mondiale)은 송신소의 위치, 방송 지역 및 사용하는 주파수에 따라, 동작모드가 A~E까지 5가지가 있으며, 모드 A~D는 30MHz이하 대역의 디지털 라디오 방송에 사용되는 모드이며, 모드 E는 Band I~II 대역의 디지털 라디오 방송에 사용되는 모드이다. 본 논문에서는 DRM 모드 A~E까지의 신호를 수신 및 분석 가능한 USB 타입 DRM 수신기 구현에 관하여 정리하였다. 대역 필터 및 디지털 다운 컨버터가 DSP를 이용하여 구현되었으며 PC Side에서 DRM 신호를 분석할 수 있도록 설계되었다.

• Journal of KIISE:Information Networking
• /
• v.30 no.2
• /
• pp.189-198
• /
• 2003

As people are damaged increasingly by personal information leakage, awareness about user privacy infringement is increasing. However, the existing DRM system does not support the protection of user's personal information because it is not necessary for the protection of copyrights. This paper is suggesting a license administration protocol which is more powerful to protect personal information in DRM. To protect the exposure of users identifier, this protocol uses temporary ID and token to guarantee anonymity and it uses a session key by ECDH to cryptography and Public-Key Cryptosystem for a message so that it can protect the exposure of personal information and user's privacy.