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

Content Provider	IEEE Xplore Digital Library
Author	Pao-Chi Chang Tzung-Hung Wu Kong-Yueh Ho
Copyright Year	2005
Description	Author affiliation: Dept. of Commun. Eng., Nat. Central Univ., Chung-li, Taiwan (Pao-Chi Chang; Tzung-Hung Wu; Kong-Yueh Ho)
Abstract	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.
Starting Page	749
Ending Page	752
File Size	3692711
Page Count	4
File Format	PDF
ISBN	0780392663
DOI	10.1109/ISPACS.2005.1595518
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-12-13
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Packet switching Discrete wavelet transforms Wavelet packets Discrete cosine transforms Audio coding Frequency measurement Wavelet domain Frequency domain analysis Filter bank Masking threshold
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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