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The paper presents a new low complexity design of Psycho-A coustic Model (PAM), which is the key technology for MPEG-2/4 Advanced Audio Coding (AAC) encoding. The real-time constraint of MPEG AA C leads to a heavy computational bottleneck on today's portable devices. To overcome this problem, design analysis and optimization of PAM are addressed at the algorithmic level. First, the dominant calculation of spreading function is replaced with small look-up tables. Second, Modified-Discrete-Cosine-Transform-based (MDCT-based) PAM with block type decision in frequency domain is proposed to reduce the overall AAC encoder complexity and maintain the quality. This technique is different from the traditional methods. The computational complexity of PAM is reduced by 82% in total. The proposed design could be implemented in a real-time MPEG-2/4 AA C stereo encoder at Low Complexity profile and bitrate 128 kb/s with computational complexity of less than 20 MOPS while maintaining CD quality. [ABSTRACT FROM AUTHOR]

Proposes a pipeline architecture of visual block pattern truncation coding algorithm to minimize mean square error. Background on the visual pattern image coding; How to improve the defects of mismatching patterns by visual pattern image coding (VPIC); Types of block pattern truncation coding.

Describes a novel Motion Picture Experts Group (MPEG)-2 audio decoder with a modified scheme. Modified decoding scheme; Efficient data arrangement and memory configuration; Conclusion.

This research utilizes embedded videotexts to achieve an intelligent multimedia display. We design a videotext in picture (TiP) display system which can extract the videotexts in the subchannel and then combine these videotexts with the main channel. This system was constructed on a dual-core platform to reach real-time videotext extraction and display. A schedulable design framework was proposed to partition the TiP display with videotext extraction in pipeline running. A data-aware transfer scheme was designed in which some data can be reused. Single instruction multiple data (SIMD) based mechanisms were created to enhance the computational efficiency on numerous convolutions and accumulations in videotext extraction. Quadruple buffering was manipulated to process the input/output in videotext extraction simultaneously. To optimize the labeling and filling tasks, the multi-banking and multi-tasking were developed. The evaluation results indicated that the proposed techniques can speed up the processing time of TiP display with videotext extraction. The equivalent comparison presented that the proposed techniques are more proficient at realizing videotext extraction. [ABSTRACT FROM PUBLISHER]

Presents a high quality, low bit rate and portable Internet-phone system. Architecture of the proposed system; General block diagram of analysis-by synthesis Linear Prediction Coding (LPC) coder; Internet-phone system outlook and its performance.