Spectral envelope coding of energy attack signal
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United States of America Patent
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Apr 28, 2015
Grant Date -
Nov 28, 2013
app pub date -
May 7, 2013
filing date -
Sep 6, 2008
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Abstract
MDCT or FFT-based audio coding algorithms often have the problem named here spectral pre-echoes when coding an energy attack signal. This invention presents several possibilities to avoid the spectral pre-echoes existing in decoded signal segment before the energy attack point. The spectral envelope before the attack point can be improved by performing spectrum smoothing, replacing the segment of having spectral pre-echoes or filtering the segment with a combined filter obtained by doing LPC analysis.
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