CODER FOR AHYBRID HDTV TERRESTRIAL BROADCASTING SYSTEMSusie

A scalable source coder was designed for a hybrid HDTV terrestrial broadcasting system. The hybrid combination of analog and digital methods allows for both high video compression ratios and eecient utilization of the available channel capacity. EEcient channel utilization enables closer receivers to decode high quality video, and allows further receivers to decode natural looking, though lower quality video. The system uses joint source/channel coding to deliver diierent video components with degrees of integrity reeecting their perceptual importance. Motivation is given for hybrid transmission and analog/digital coding methods. Details of the scalable source coder are provided with a description of its key features, which include pyramid l-tering and hybrid video coding. Furthermore, fundamental diierences between conventional digital video compression schemes and the proposed scalable hybrid approach are highlighted. Finally, frames of video produced by a computer simulation of the hybrid HDTV system are shown, demonstrating the feasibility of such a system.