Radio receivers for receiving both VSB and QAM digital HDTV signals

A radio receiver for receiving a selected one of television signals each including symbol codes descriptive of digital signals, irrespective of whether said selected television signal is a quadrature-amplitude-modulation (QAM) signal or is a vestigial-sideband (VSB) signal including a pilot carrier having an amplitude related to signal levels in said symbol codes thereof, said radio receiver comprising:

• a tuner for selecting said selected television signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, and converting it to a final intermediate-frequency (IF) signal, the carrier of which said final intermediate-frequency (IF) signal is a first prescribed subharmonic of a multiple of 21.52 MHz if said selected television signal is a QAM signal and is a second prescribed subharmonic of said multiple of 21.52 MHz if said selected television signal is a VSB signal, said first prescribed subharmonic of said multiple of 21.52 MHz being lower in frequency than said second prescribed subharmonic thereof;
• an analog-to-digital converter for digitizing said final IF signal at a rate harmonically related to 21.52 MHz;
• QAM synchrodyning circuitry for generating real and imaginary sample streams of interleaved QAM symbol code, by synchrodyning said digitized final IF signal to baseband providing it is a QAM signal and otherwise processing said digitized final IF signal as if it were a QAM signal to be synchrodyned to baseband;
• and
• VSB synchrodyning circuitry for generating a real sample stream of interleaved VSB symbol code, by synchrodyning said digitized final IF signal to baseband providing it is a VSB signal and otherwise processing said digitized final IF signal as if it were a VSB signal to be synchrodyned to baseband.

A radio receiver for receiving a selected one of television signals each including symbol codes descriptive of digital signals, irrespective of whether said selected digital television signal is a quadrature-amplitude-modulation (QAM) signal or is a vestigial-sideband (VSB) signal including a pilot carrier having an amplitude related to signal levels in said symbol codes thereof, said radio receiver comprising:

• a tuner for selecting said selected television signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal, and converting it to a final intermediate-frequency (IF) signal, the carrier of which said final IF signal is a prescribed subharmonic of a multiple of the symbol frequency of said QAM signal if said selected television signal is a QAM signal and is a prescribed subharmonic of a multiple of the symbol frequency of said VSB signal if said selected television signal is a VSB signal, wherein said prescribed subharmonic of a multiple of the symbol frequency of said QAM signal being lower in frequency than said prescribed subharmonic of a multiple of the symbol frequency of said VSB signal by an amount corresponding to the offset in frequency of the carrier frequency of said VSB signal from the carrier frequency of said QAM signal as those signals are received by said radio receiver;
• QAM synchrodyning circuitry for generating real and imaginary sample streams of interleaved QAM symbol code, by synchrodyning said final IF signal to baseband providing it is a QAM signal and otherwise processing said final IF signal as if it were a QAM signal to be synchrodyned to baseband;
• and
• VSB synchrodyning circuitry for generating a real sample stream of interleaved VSB symbol code, by synchrodyning said final IF signal to baseband providing it is a VSB signal and otherwise processing said final IF signal as if it were a VSB signal to be synchrodyned to baseband.