Patent ID: 8151175
Filing Date: 2012-04-03
Classification: H03M

Abstract:
1. A method of electronic decoding comprising: receiving, at a first decoding device, a data stream comprising a sequence of bits; performing, using the first decoding device, convolutional decoding on the sequence of bits in the data stream; identifying, using an off track event detector, an occurrence of a trellis decode path change during the convolutional decoding of the sequence of bits by the first decoder; identifying, using the off track event detector, a first symbol proximate to the sequence of bits corresponding to the occurrence of the trellis decode path change; identifying, using an erasure decision circuit, at least the first symbol for erasure; receiving, at a second decoder, the output of the first decoder and the erasure decision circuit; decoding, using a second decoding device, the output of the first decoder after erasing at least the first symbol; and outputting from the second decoding device decoded corrected data.