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一 经过多年的研究与开发,电视图像数字压缩技术已经进入实用化。采用运动估值/补偿技术和离散余弦变换(DCT),能将图像数据压缩几十倍,并在“解压缩”恢复后仍能得到好的视觉效果。相应的视频压缩标准MPEG-2和卫星电视传输标准DVB-S亦已为国际上所广泛采用。我国也等效采用了DVB-S等标准。数字卫星电视广播自1994年在美国开始商业应用以来,发展异常迅速。到去
After years of research and development, digital image compression technology has come into practical use. Using motion estimation / compensation techniques and discrete cosine transform (DCT), the image data can be compressed tens of times and still get good visual results after “decompression” is resumed. Corresponding video compression standards MPEG-2 and satellite TV transmission standard DVB-S has also been widely used internationally. China is also equivalent to using DVB-S and other standards. Digital satellite television broadcasting has developed exceptionally rapidly since its commercial deployment in the United States in 1994. To go