A system for reconstructing a signal waveform from a correlogram is based upon the recognition that the information in each channel of the correlogram is equivalent to the magnitude of the Fourier transform of a signal. By estimating a signal on the basis of its Short-Time Fourier Transform Magnitude, each channel of information from a cochlear model can be reconstructed. Once this information is retrieved, a signal waveform can be resynthesized through inversion of the cochlear model. The process for reconstructing the cochlear model data can be optimized with the use of techniques for improving the initial estimate of the signal from the magnitude of its Fourier Transform, and by employing information that is known apriori about the signal during the estimation process, such as the characteristics of sound signals.
申请公布号
WO9419792(A1)
申请公布日期
1994.09.01
申请号
WO1994US01879
申请日期
1994.02.22
申请人
APPLE COMPUTER, INC.;SLANEY, MALCOLM;LYON, RICHARD, F.;NAAR, DANIEL