Apparatus for restoring carrier wave and method therefor

Abstract

A carrier wave restoring apparatus which is capable of restoring a carrier wave quickly and accurately by selectively controlling an operation of a matching filter. The carrier wave restoring apparatus comprises a filtering unit for filtering a broadcast signal and outputting a match filtering signal; a multiplier for receiving the matching filtering signal and generating an ‘I’ (Inphase) signal and a ‘Q’ (Quadrature) signal; an error detector for accumulating a sign bit of a DC component of the ‘I’ signal, comparing it with a predetermined threshold, and outputting a control signal to the filtering unit; and a gain controlling unit for receiving the ‘I’ signal and the ‘Q’ signal from the multiplier and outputting a gain control signal to control a carrier wave restoration velocity according to the control signal of the error detector.

Dependencies are inferred from the claim text.