jpeg编码和解码，给出了jpeg文件量化表，编码表及其数据的读入-encoding and decoding jpeg, jpeg files are given quantization table, coding table and its data is read into

TRec is a software to record telephone conversation by means microphone input of PC sound card. It support voice level input detector and threshold level. When running, the software always check the level of microphone input level. If the lev