| Summary: | 碩士 === 國立臺灣大學 === 電機工程學研究所 === 95 === Windows Media Audio system is a CODEC designed especially for music and sound, in which packets are saved and showed in Advanced Systems Format stream. And each Advanced Systems Format file consists of one or more digital media streams. Windows Media Video and Windows Media Audio always play in and along with Advanced Systems Format file.
Moreover, Windows Media Audio system employs the waveform coding and variable-length coding to achieve its compression. And, applying the mode of human psychoacoustics, it manages to display the high quality of the sample, even at low data rates.
In this thesis, an attempt is made to concisely discuss the decoding procedure of Advanced Systems Format and Windows Media Audio, and compare the sound quality with other popular audio CODECs. The experiment aims to employ both Objective and Subjective Quality Measurement, and eventually to arrive at a clarifying analysis on the result of coding quality of Windows Media Audio system.
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