2 . reseach different methods and steps carried out including discrete cosine translation , run - length enconding and haffman encoding about signals coding and decoding . the signal - coding structure diagrams and programmable flow charts are not only established but also the applide program about signal coding and decoding is complied on vc developable flat 研究了信源編解碼的各種方法(包括dct 、游程編碼和哈夫曼編碼等)以及實(shí)現(xiàn)的步驟,建立了信源編碼實(shí)現(xiàn)的結(jié)構(gòu)圖和程序流程圖,并在vc的開發(fā)平臺(tái)下,編制了信源編解碼實(shí)現(xiàn)過(guò)程的應(yīng)用程序。