Audio Bandwidth Extension based on Maximum Lyapunov Prediction
In this paper, the maximum Lyapunov exponent and the correlation dimension are first utilized to determine the chaotic characteristics of audio spectrum based on nonlinear analysis method. Next, the maximum Lyapunov prediction and codebook mapping are used to recover the fine structure and envelope of high-frequency spectrum separately. By using above two approaches, the bandwidth of wideband audio is extended to super-wideband. Finally, this bandwidth extension method is applied into G.722.1 audio codec. The test results indicate that the proposed method outperforms the conventional algorithms in most cases, and the perceived quality of the extended super-wideband audio in the real wideband audio codec system is comparable with that of directly reconstructed audio using super-wideband audio coding at the bit-rate of 24 kb/s.
Xingtao Zhang Changchun Bao Xin Liu Liyan Zhang Feng Bao Bing Bu
Speech and Audio Signal Processing Laboratory, School of Electronic Information and Control Engineer Speech and Audio Signal Processing Laboratory, School of Electronic Information and Control Engineer
国际会议
2011亚太信号与信息处理协会年度峰会(APSIPAASC 2011)
西安
英文
1-4
2011-10-18（万方平台首次上网日期，不代表论文的发表时间）