Digital Broadcasting Satellite (DBS) 수신기는 실시간으로 위성으로부터 수신되는 방송신호를 실시간으로 NTSC A/V 스트림으로 변환하는 기능을 수행한다. 따라서 Multi-tasking 방식은 실시간 응용시스템에서 프로세서의 효율적인 사용에 매우 효과적인 방법이다. 본 논문에서는 H/W, S/W micro kernel을 이용한 hybrid approach를 통하여 H/W micro kernel과 multi-tasking programming과의 관계를 적절히 조절하여 시스템의 처리속도를 증가시켰다. 또한 DBS수신기에서의 실시간 처리를 위해 각각의 프로세스들간의 스케쥴 적정성을 확보하기 위해 시스템의 요구사항이 만족되도록 개발된 critical hard real-time task들에 대한 스케쥴 적정성을 먼저 평가하고, 그 밖의 soft real-time task 들에 대한 스케쥴링 가능성에 대한 평가를 진행하여 전체적으로 실시간 처리에 문제가 발생하지 않도록 embedded 소프트웨어를 개발하였다.
KSP Keywords
Digital Broadcasting, Hard real-time, Multi-Tasking, Real-time tasks, Soft real-time, broadcasting satellite
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