APPARATUS FOR RECOVERING CARRIER IN DIGITAL TV RECEIVER

摘要

Purpose: although wherein a frequency existing for a carrier signal is disappeared by a terrible sound, one device, for restoring a carrier in a digital TV receiver, it is arranged to restore carrier, it is by restoring the carrier using a carrier component, it is present in a transmission channel, the carrier signal that one be used in a data interval receives signal exists. Construction: a complex multiplier (301) increases an imaginary signal of a real signal and a passband by proportional to a phase error one with reference to complex carrier, the imaginary signal of real signal and passband is converted to the real signal and an imaginary signal of a base band. One real signal generating set has the imaginary signal of squarer (302,303) and a subtracter (304) square real signal and base band, and a square imaginary signal is subtracted from square real signal, generates a new real signal. One imaginary signal generating set has a multiplier (305) and a gain unit (306), increases the imaginary signal of base band by the real signal of base band, adjusts income, generates a new imaginary signal. The new imaginary signal of the imaginary signal that LPFs (low-pass filter) (307,309) only filters a real signal and a carrier component from new real signal. One error detection code (308) and a NCO (numerically-controlled oscillator) (310) detect a residual error of carrier from the real signal and imaginary signal of filtration, generate proportional to residual error refers to complex carrier, and output is with reference to complex carrier to complex multiplier (301).