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DMB (Digital multimedia Broadcasting)

DMB (Digital multimedia Broadcasting). 2007-11852 현근수. What is DMB?. A digital radio transmission system for sending multimed ia (radio, TV and datacasting) to mobile devices such as mobile phones.

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DMB (Digital multimedia Broadcasting)

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  1. DMB(Digital multimedia Broadcasting) 2007-11852 현근수

  2. What is DMB? • A digital radio transmission system for sending multimed ia (radio, TV and datacasting) to mobile devices such as mobile phones. • This technology, sometimes known as “mobile TV”, is an offshoot of Digital Audio Broadcasting which was originally developed as a research project for the EU.

  3. DMB’s traits • Mobility • can in 150km/h • Personal • Compact Television • Interactive • PAD (Program Associated Data) • NPAD(Non-PAD)

  4. DMB receiver

  5. DMB in Worldwide • 유럽 • Radio – DAB • TV- DVB-H • 미국 • MediaFLO • 일본 • ISDB-T , SDMB • 한국 • T-DMB S-DMB

  6. Moblie TV의 비교

  7. T-DMB • 지상 기지국을 통한 주파수를 이용한 전송 (12번채널과 8번채널이용) • EUREKA-147 기반 • 이동 중 지속적 안정적 수신 • 간섭영향 잡음 간섭영향에 강점 • 단일 주파수망이 불가능 하고 권역별 방송만 가능

  8. S-DMB • 위성을 이용하여 넓은 지역을 커버하며 기존의 범위에서 획기적인 확대 • 각도와 지형적문제로 음영지역 발생 • GAP filtter 로 음영지역에도 서비스 • 수신단말기의 형태 • Mobile phone, portable stand-alone , VMT , PDA

  9. SDMB의 GF를 이용한 전송

  10. DVB-H • DVB-T 규격의 하위 호환성을 고려하여 저전력 이동단말용으로 개발한 규격 • Time slicing • Layered CODEC – 신호의 세기에 따라 조절 • TDMB SDMB 전송속도에 따라 수신

  11. FLO • Air interface 규격으로 기존의 CDMA와는 다른 규격 • 방송 주파수를 이용하여 멀티 캐스트를 하고 3G망을 return path채널로 활용 • MLC support • Time slicing 과 유사 • Time diversity 효과 • data 전송 효율 우수

  12. DMB 응용서비스 • Radio Service • High quality audio Broadcasting • Additional Video Information • Caching Based Service • HTML Based Web Caching • Associated Short Video Clip Broadcasting • Real Time Traffic Information • 속도 혼잡 속보정보 • LBI (Location Based Information)

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