| Summary: | 碩士 === 國立臺北科技大學 === 資訊工程系研究所 === 99 === In this thesis, we study the features of MPEG-4 ALS encoder, the optimal encoder is not public, and it can quickly estimate an optimal order for each blocks, so we try to guess the method of the optimal encoder.
First, we test the features of encoder and transients for the choice of block switch level, then experiment the different between pop music and classical music. Furthermore, in order to reduce quantization error, we implement a method, on the other hand, according to the optimization theory, we try to find the best quantization step, to improve the encoding effect. Finally, we found “Least Square method” on digital signal processing books, it can also result the linear prediction coefficients, so we implement it to compare with Levinson-Durbin for residual energy and residual encoded bits, and discuss whether it suits this system.
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