DIGITAL VSB DETECTOR WITH BANDPASS PHASE TRACKER USING RADEAR FILTERS, AS FOR USE IN AN HDTV RECEIVER

摘要

In a radio receiver for a residual side band (VSB) signal comprising a symbol code representing a digital signal, the HDTV signal is typical of a VSB signal and the tuner is located at a different location in the frequency band used to transmit such a VSB signal. It is provided to select one of the channels. The tuner also includes a mixer for performing plural conversion of the selected channel into the final intermediate frequency signal digitized by the analog-digital converter. The phase tracker operating in the narrowband filter region of the final intermediate frequency signal digitized around its carrier frequency is the imaginary number of the final intermediate frequency signal resulting from phase incoherence in the local oscillation used in the multiple distortion or frequency conversion process. Oppress the area. The digitally controlled oscillator in the phase tracker provides a digital representation of the carrier for the final intermediate frequency signal to the synchronization detector, which detects the real region of the final intermediate frequency signal digitized according to that representation of the carrier. A pair of digital filters, designed on the basis of the Jacobian elliptic function as described by C, M. Rader, exhibiting a constant π / 2 difference in phase response to the digitized band signal. It is used in phase tracker for generating real and imaginary regions of.