专利名称：Synchronization signal detection and phase
estimation apparatus and method
发明人：Alex Zatsman申请号：US09/104936申请日：19980625公开号：US06144413A公开日：20001107
摘要：A digital television (DTV) receiver receives a data signal that is divided into aplurality of segments each separated by a known data segment sync sequence. Thereceiver includes a data segment sync signal detector that receives the data signal andfilters the signal to provide a filtered data signal. The detector computes the differencebetween samples of the filtered data signal and an average expected filtered signal valuethat is representative of a nominal filtered signal value in the middle of the segment syncsequence. The detector then computes the absolute value of the computed difference,and the resultant absolute value is summed with a sampled value from the previoussegment and the summed value is stored into an accumulator. The process is repeatedfor several segments. The location of the data segment sync sequence within thesegment is determined by comparing the summed values to determine the smallestsummed value, which represents the center of the segment sync sequence. Filtering thedata signal with a filter provides a filtered data signal that facilitates accurate detectionof the data segment sync sequence and computation of an initial estimate of thesampling phase.
申请人：ANALOG DEVICES, INC.
代理机构：Samuels, Gauthier & Stevens, LLP
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