標題: High frequency reconstruction by linear extrapolation
作者: Liu, Chi-min
Lee, Wen-chieh
Hsu, Han-Wen
公開日期: 8-May-2008
摘要: High frequency components of audio signals are reconstructed from the aspects of envelope and fine detail. The envelopes of the high frequency components are found through linear extrapolation of signals with frequencies lower than a cutoff frequency point. One method of reconstructing high frequency components is based on the linear extrapolation on the logarithm scale magnitudes of the transform coefficients of the audio signal in a frequency domain. The linear extrapolation is a linear approximation based on minimizing least squares of the logarithm scale magnitudes of the transform coefficients of the low frequency components. Another method is based on the linear extrapolation on the logarithm scale magnitudes of the envelope elements of the filterbank signals of the audio signal over a time segment. The linear extrapolation is a linear approximation based on minimizing least squares of the logarithm scale magnitudes of the envelope elements of the low frequency filterbank signals.
官方說明文件#: G10L019/00
URI: http://hdl.handle.net/11536/105604
專利國: USA
專利號碼: 20080109215
Appears in Collections:Patents


Files in This Item:

  1. 20080109215.pdf

If it is a zip file, please download the file and unzip it, then open index.html in a browser to view the full text content.