Patent ID: 7606705
Filing Date: 2009-10-20
Classification: H04L

Abstract:
1. A method of channel decoding speech frames in a receiver capable of multiple (M) codec modes, said channel encoded speech frames comprised of an inband bit portion and a speech portion, said method comprising: calculating, by an inband bit decoder of the receiver, a plurality of inband decode metrics, one for each speech codec mode before a decoding error has been detected; ordering, by the inband bit decoder, the inband decode metrics from highest to lowest representing a most likely codec mode to a least likely codec mode, respectively, before a decoding error has been detected, based upon a Euclidian distance measure; partially decoding, by a channel decoder of the receiver, speech data for each speech codec mode; determining, by the channel decoder, the most likely speech codec mode based upon the partially decoded speech data and the calculated inband decode metric data; and resuming, by the channel decoder, decoding of the speech data using the most likely speech codec mode, the resumed decoding comprising a recursive convolutional decode.