Patent ID: 7167683

Claim:
A Radio Frequency (RF) receiver comprising: a demodulator that is operable to receive a plurality of bursts that make up a speech frame and to convert the plurality of bursts to a baseband signal, wherein each of the plurality of bursts includes coded speech data and a received training sequence; at least one digital processing component communicatively coupled to the demodulator to receive the baseband signal and that is operable to process the baseband signal for each of the plurality of bursts to: perform a plurality of correlation operations on a respective received training sequence using a local sequence to produce a plurality of correlation sequences, each correlation sequence including a plurality of correlation values and being respective to a contiguous portion of the training sequence; separately sum the correlation values of the correlation sequences to produce a plurality of sums; based upon one of the plurality of sums, determine an estimated signal power; determine an estimated noise power based upon the received training sequence; based upon the estimated signal power and the estimated noise power, determine an estimated signal-to-noise ratio (ESNR) for the respective burst; compare the ESNR of each of the plurality of bursts to an ESNR criteria; and consider comparisons of the LSNRs of the plurality of bursts to the ESNR criteria in determining whether to indicate that the speech frame is bad.