Digital VSB detector with bandpass phase tracker using Ng filters, as for use in an HDTV receiver

A radio receiver for digital television signals transmitted at a prescribed symbol transmission rate, said radio receiver comprising

• a tuner for selecting one of channels at different locations in a frequency band and frequency converting the selected channel to a final intermediate-frequency signal in a final intermediate-frequency band;
• an analog-to-digital converter for digitizing said final intermediate-frequency signal at a sample rate that is four times said symbol transmission rate, to generate as an output signal thereof digitized final intermediate-frequency signal;
• and
• digital circuitry for synchrodyning said digitized final intermediate-frequency signal to baseband, which said digital circuitry comprises:
• a digitally controlled oscillator for generating digitized samples of a cosine wave of a controlled frequency and digitized samples of a sine wave of said controlled frequency, said controlled frequency being controllable over a range of frequencies including the carrier frequency of said final intermediate-frequency signal in response to a digital control signal indicative of the difference of said controlled frequency from a desired frequency;
• a first finite-impulse-response digital filter generating a first digital filter response to frequencies throughout said final intermediate-frequency band, said first digital filter response being a linear-phase real response;
• a second finite-impulse-response digital filter generating a second digital filter response to frequencies throughout said final intermediate-frequency band, said second digital filter response being a linear-phase imaginary response;
• means for applying said digitized final intermediate-frequency signal to said first and second digital filters as a shared input signal to each of them;
• a first digital multiplier, receptive of the digitized samples of said cosine wave of said controlled frequency as its multiplier signal, for generating a first product signal;
• means for applying said first digital filter response to said first digital multiplier as its multiplicand signal;
• a second digital multiplier, receptive of the digitized samples of said sine wave of said controlled frequency as its multiplier signal, for generating a second product signal;
• means for applying said second digital filter response to said second digital multiplier as its multiplicand signal;
• and
• a first digital adder additively combining said first and second product signals for generating a first sum signal supplied as an output signal from said digital circuitry for synchrodyning said digitized final intermediate-frequency signal to baseband.