Patent
Switching between coding schemes
Juha Ojanpera
- 11 Mar 2003
85
TL;DR: In this paper, the authors proposed a switching from a first coding scheme to an MDCT based coding scheme calculating a forward or inverse modified discrete cosine transform with a window (h(n)) of a first type for a respective coding frame, which satisfies constraints of perfect reconstruction.
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Abstract: The invention relates to methods and units for supporting a switching from a first coding scheme to an MDCT based coding scheme calculating a forward or inverse Modified Discrete Cosine Transform with a window (h(n)) of a first type for a respective coding frame, which satisfies constraints of perfect reconstruction. In order to avoid discontinuities during the switching, it is proposed that for a transient frame immediately after a switching, a sequence of windows (h0(n),h1(n),h2(n)) is provided for the forward and the inverse Modified Discrete Cosine Transforms. The windows of the window sequence are shorter than windows of the first type. The window sequence splits the spectrum of a respective first coding frame into nearly uncorrelated spectral components when used as basis for forward Modified Discrete Cosine Transforms, and the second half of the last window (h2(n)) of the sequence of windows is identical to the second half of a window of the first type.
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Citations
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85
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