Packet loss compensation method using injection of spectrally shaped noise
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United States of America Patent
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Feb 21, 2006
Grant Date -
Oct 11, 2001
app pub date -
Jan 18, 2001
filing date -
Jan 18, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An insertion-based error concealment method and apparatus are provided whereby, instead of directly inserting white noise, a filter is created to shape the white noise. The filtered white noise is then used to replace lost data. The method of the present invention is implemented by first estimating the power spectrum of the previous frame; then designing a filter with transfer function H(f), where |H(f)|2=the estimated power spectrum; and finally generating the replacement packet using noise which has been spectrally modified by the filter. The resulting filtered noise has the same power spectrum as the previous packet but is not highly correlated with it.
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