High quality switched wavelet packet and discrete cosine transform audio coding technique

Pao Chi Chang, Tzung Hung Wu, Kong Yueh Ho

研究成果: 書貢獻/報告類型會議論文篇章同行評審

摘要

We propose a hybrid coding system that utilizes both Wavelet Packet (WP) and DCT techniques. To process each audio frame, the system selects either WP or DCT as the transform based on the frame flatness measures in the wavelet domain and the frequency domain. If DCT is chosen, all DCT coefficients are quantized by a non-uniform quantizer according to the frequency masking curve. On the other hand, frame data are segmented into 26 fixed subbands when WP is chosen. Then, the system selectively utilizes DCT to promote frequency resolution of each subband based on the subband flatness measure. By quoting optimal bit-allocation for non-ideal filter bank, the masking threshold from psychoacoustic model can be translated into specific criteria in the wavelet domain for quantization. Experiment results show that the proposed system is superior to MP3 and AAC LC profile at 64k bps.

原文???core.languages.en_GB???
主出版物標題Proceedings of 2005 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2005
頁面749-752
頁數4
出版狀態已出版 - 2005
事件2005 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2005 - Hong Kong, China
持續時間: 13 12月 200516 12月 2005

出版系列

名字Proceedings of 2005 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2005
2005

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???event.eventtypes.event.conference???2005 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2005
國家/地區China
城市Hong Kong
期間13/12/0516/12/05

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