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

Pao Chi Chang, Tzung Hung Wu, Kong Yueh Ho

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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.

Original languageEnglish
Title of host publicationProceedings of 2005 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2005
Pages749-752
Number of pages4
StatePublished - 2005
Event2005 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2005 - Hong Kong, China
Duration: 13 Dec 200516 Dec 2005

Publication series

NameProceedings of 2005 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2005
Volume2005

Conference

Conference2005 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2005
Country/TerritoryChina
CityHong Kong
Period13/12/0516/12/05

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