Patent ID: 9111573
Filing Date: 2015-08-18
Classification: G11B

Abstract:
1. A method, comprising: receiving a plurality of samples by a long filter and a short filter; performing short filter operations on the plurality of samples by the short filter; performing long filter operations on the plurality of samples by the long filter; receiving short filter outputs from the short filter; receiving long filter outputs from the long filter; receiving information from a zero phase start module, the information including a target phase constraint, a polyant, and a zero phase start phase; selecting two samples per preamble cycle of the short filter outputs and the long filter outputs based on the target phase constraint, the polyant, and the zero phase start phase; decimating the short filter outputs and the long filter outputs such that the selected two samples for each of the long filter and the short filer per preamble cycle are output upon decimation; and performing a sign comparison on the corresponding short filter and long filter outputs after decimation, wherein a sign mismatch of the corresponding short filter and long filter outputs indicates an end of a preamble.