Digital Residual Sideband Detector with Bandpass Phase Tracker Using Radar Filter for High Quality Television Receivers

摘要

For a radioside receiver (VSB) signal comprising a symbol code representing a digital signal, in a wireless receiver, 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 mid frequency signal digitized by the analog-digital converter. A phase tracker operating in the narrowband filter region of the final intermediate frequency signal digitized around its carrier frequency is used to determine the final intermediate frequency signal resulting from phase incoherence in the local oscillation used in the multiple distortion or frequency conversion process. Suppress imaginary areas. 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 global digital filters, designed on the basis of Jacobian elliptic functions as described by CMRader, exhibit a constant π / 2 difference in phase response for the digitized band signal. And a phase tracker for generating an imaginary region.