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)以及實現的步驟,建立了信源編碼實現的結構圖和程序流程圖,并在vc的開發平臺下,編制了信源編解碼實現過程的應用程序。