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- W1931453834 abstract "Audio technology is an important part in our life. Everyday, people listen to their favorite songs from broadcast、iPod、cellular phone…etc. After the MP3 very popular in the world, the MPEG organization proposed MPEG-2/4 AAC to be the next generation audio standard. In this thesis, we will present the key component design for MPEG-2/4 encoder of the portable device. Psychoacoustic Model (PAM) as the key component in the MPEG-2/4 AAC encoder. It occupies the heavy computation load in AAC encoder and makes the AAC encoder hard to be implemented on the portable device under the real-time and low power condition. In order to overcome the above described problem, we proposed a dedicated co-processor design to speedup computation of the PAM. In algorithm level, the MDCT-based PAM、the look-up table of the spreading function ,the log-scale table of the Threshold Generator (TG) calculation are adopt to this design. Besides, logarithmic based Quantization Loop (Q Loop) algorithm is proposed to solve the scale and complexity computation problem between PAM and Q Loop. In architecture level, the pipelined MDCT and DSP-like architecture are proposed for the high efficient and low complexity consideration, respectively. The proposed PAM architecture is implemented in the TSMC 0.18 CMOS technology, total gate count is 28349. The proposed architecture can encoding stereo content with the DSP or the RISC, whose MOPS below 7 MOPS at sampling rate 44.1k and bitrate 128kbit/s." @default.
- W1931453834 created "2016-06-24" @default.
- W1931453834 creator A5038364233 @default.
- W1931453834 date "2006-01-01" @default.
- W1931453834 modified "2023-09-24" @default.
- W1931453834 title "適用於MPEG-2/4 AAC編碼器的低複雜度MDCT-based聲學模型協同處理器設計與VLSI實現" @default.
- W1931453834 hasPublicationYear "2006" @default.
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