Patent ID: 7406411

Claim:
A method of detecting bit errors in an input signal having at least a current signal segment and a previous signal segment, the previous signal segment having a log-gain value (qlg(m−1)), where m represents a current sub-frame index, and immediately preceding the current signal segment, the method comprising: estimating a level lvl(m−1) of the input signal; determining a log-gain value qlg(m) of the current signal segment within the input signal; determining a difference between the gain value of the current signal segment and the previous signal segment; and determining whether the difference exceeds a threshold; wherein the threshold (i) is adaptive to the input signal level and (ii) is a function of the previous signal segment log-gain value (qlg(m−1)) and an amount of change between the previous signal segment log-gain value (qlg(m−1)) and a log-gain value of signal segments prior to the previous signal segment.