Voice decoder and method for detecting channel errors using spectral energy evolution
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United States of America Patent
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Dec 2, 2003
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N/A
app pub date -
Aug 6, 1999
filing date -
Aug 6, 1999
priority date (Note) -
Expired
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Abstract
A voice decoder detects channel errors and loss of cryptographic synchronization using the change in spectral energy between sequential frames. The change in energy between frames is determined between corresponding LSP's of said successive frames and summed together. A running average of the change in energy for a predetermined number of frames is maintained. Current voice frames are eliminated based on the difference between the change in energy associated with the current frame and the running average. Accordingly, offensive audio associated with such channel errors or cryptographic synchronization loss is eliminated.
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