HDTV的参数选择及计算机模拟(英文)

AN ALL DIGITAL HDTV FOR CHINA:ITS PARAMETER SELECTION AND COMPUTER SIMULATION

讨论了全数字HDTV参数的选择原則,提出了一组基于逐行扫描的HDTV参数。参考DigiCipher方案,实现了全数字信源/信道编解码算法。算法包括:运动检测与补偿,快速2D-DCT、游程编码,基于RS(215,255)码的误码保护等。计算机模拟结果表明,在压缩比40～60倍情况下,无察觉到的图像质量有明显的下降。这证明本方案可以在我国8MHz电视频道內与PAL信号实现同播。

This paper discusses the principles that should be followed in the selection of parameters of IIDTV. A set of parameters, 'based on progressive scanning is proposed. With reference to DigiCipher, all digital source/channel coding and decoding algorithms including motion-compensatcd inter-frame prcdietion, fast 2D-DCF, run-length coding and error-protection with RS (215, 255) codes are implemented. Computer simulation results show that at a compression ratio of 40～60, no noticeable picture degradation is observed. This proves that our simulated IIDTV system can work satisfactorily for co-channel broadcasting with the current PAL system.