When the high rate data is transmitted through bandlimited channels in mobile communications , the intersymbol interference ( isi ) caused by channel distortion and multipath propagation will bring decoding error . it needs to adopt appropriate techniques to remove or reduce this kind of interference 當在帶限信道上傳輸高速數據時,會因為信道畸變和多徑效應產生的碼間干擾而產生誤碼,這就需要采用適當的技術來消除或減少這種干擾。
An error detecting method which can prevent the decoding error affecting the next video packet head is used , and a restoration measure for b frame based on the mv prediction which can improve the visual quality has been studied . 3 . a novel marking algorithm for ip diffserv based on the transmission condition and the different importance of video streams for decoder has been introduced 2實現了mpeg - 4的差錯檢測、可逆變長解碼rvld和差錯掩蓋方法:對i或p幀紋理區的差錯先用rvld進行解碼,然后對殘留的差錯用空間插值或運動補償方法進行掩蓋,而對p幀的運動矢量mv ,利用圖像的空間平滑特性進行恢復; 3針對b幀差錯的復原,我們還提出了一種基于運動估計的方法。