具無線網路功能之數位錄影機的設計與實現

Abstract

目前市面上的可攜式數位錄影機，因為受限於記憶卡的容量，而無法長時間錄影。為了解決這樣的問題，本篇論文提出數位錄影機整合無線網路的構想，不但可解決儲存容量不足的問題，還可增加無線網路的相關應用，進而提高數位錄影機的附加價值。 為了驗證此設計概念的可行性，特別實作了一部具有無線網路功能的可攜式數位錄影機。實作平台採用具有ARM和DSP雙核心架構的OMAP5912，以Linux為作業系統，整合了USB攝影機作為影像來源、觸控式面板作為顯示裝置，以及USB無線網路模組讓系統連上網路。 本論文並對實作產品進行一系列功能測試，實證結果顯示本設計概念不但可行，且其新增功能使其具有比市面上錄影機更迷人的優點，如：無線網路使檔案傳輸更便利、影像串流功能讓使用者可即時分享錄影畫面、透過遠端控制還可輕易地達成監控的功能、擁有不受限制的外部儲存空間，以及擁有易於擴充及提升功能性之彈性。

The recording time of a conventional Digital Video Recorder (DVR) is always limited by the capacity of its storage devices. To overcome this inconvenience, a design concept which incorporates the wireless function and the network function into a DVR is presented in this thesis. This approach not only solves the storage problem, but also enables a DVR to provide value-added services. To verify the feasibility of the concept, a DVR with wireless network function is implemented. The prototype product is built on an OMAP5912 platform with embedded Linux operating system, which integrates a USB camera as the capture device, a touch screen as a display unit, and a USB wireless network module to makes the system net-workable. A series of performance testing has been conducted on the product. The testing results indicates that the design concept is feasible and the product so constructed is more attractive than the conventional DVR in terms of its portability, being easier to access, watching while recording capability, remote control and monitoring capability, unlimited external storage capacity, and the flexibility to add interested functions and to upgrade performance.