ویراساینس.
سند علمی

Improved Time Delay Analysis/Synthesis for Parametric Stereo Audio Coding

Christophe Tournery, Christof Faller

چکیده

The time delay for each partition is estimated as the slope of the phase difference between left and right channels Φ(k, i) = arg (X1(k, i)X ? 2 (k, i)) . Below the phase wrapping boundary the slope corresponds to phase delays, and to group delays above. Φ̂(k, i) = a1i or Φ̂(k, i) = a1i + a0 The linear regression is done in the weighted least squares sense, with weights chosen as a function of the magnitude of the crossspectrum between left and right. [ a1 a0 ]T = ( HWH )−1 HWy , Where H is a N × 2 matrix of frequency indices (first column) and ones (second column), and yi = Φ(k, i).

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