Method and apparatus for processing a signal with a coarsely positioned IF frequency

A receiver for processing received transmission signals to provide information for a desired channel signal, wherein the receiver comprises:

• an analog processing block for providing coarse filtering and amplification to a multi-channel signal to produce a first signal, the coarse filtering being configured to use pass bands that are wide enough to accommodate frequency shifts in the desired channel signal and analog circuitry variability, the first signal being a coarse channel signal;
• an analog to digital converter coupled to the analog processing block for digitizing the first signal to produce a second signal, the second signal being a digitized coarse channel signal;
• and
• a digital processing block coupled to the analog to digital converter for processing the second signal to obtain the information for the desired channel signal, wherein the receiver is configured to track a carrier frequency of the desired channel signal and generate and apply a frequency shift feedback signal to compensate for frequency shifts in the carrier frequency;
• wherein the digital processing block is configured to additionally apply a known frequency shift for known frequency offset errors in the carrier frequency;
• and
• wherein the digital processing block is further configured to process the digitized coarse channel signal to provide a processed digitized coarse channel signal, and the digital processing block comprises a first processing block having a frequency tracking loop for tracking the carrier frequency of the desired channel signal, wherein the frequency tracking loop comprises:
• a first frequency rotator for shifting frequency content of the processed digitized coarse channel signal to baseband based on the known frequency shift and additionally based on the frequency shift feedback signal for analog broadcast transmission standards;
• a filter stage for filtering the output of the first frequency rotator;
• and
• a digital variable gain amplifier for amplifying the output of the filter stage.

A method of processing received transmission signals in a receiver to provide information for a desired channel signal, wherein the method comprises:

• providing coarse filtering and amplification to a multi-channel signal to produce a first signal, the coarse filtering being configured to use pass bands that are wide enough to accommodate frequency shifts in the desired channel signal and analog circuitry variability in the receiver, the first signal being a coarse channel signal;
• digitizing the first signal to produce a second signal, the second signal being a digitized coarse channel signal;
• processing the second signal digitally to obtain the information for the desired channel signal by tracking a carrier frequency of the desired channel signal;
• generating and applying a frequency shift feedback signal to compensate for frequency shifts in the carrier frequency;
• and
• applying a known frequency shift for known frequency offset errors in the carrier frequency;
• wherein the method comprises utilizing an RF processing block for receiving transmission signals and providing amplification, filtering and mixing to generate the multi- channel signal, the RF processing block comprising a mixing stage having an oscillator with a coarse step size or a fine step size, and the method further comprises compensating for the step size of the oscillator when generating the known frequency shift.

A method of processing received transmission signals in a receiver to provide information for a desired channel signal, wherein the method comprises:

• providing coarse filtering and amplification to a multi-channel signal to produce a first signal, the coarse filtering being configured to use pass bands that are wide enough to accommodate frequency shifts in the desired channel signal and analog circuitry variability in the receiver, the first signal being a coarse channel signal;
• digitizing the first signal to produce a second signal, the second signal being a digitized coarse channel signal;
• processing the second signal digitally to obtain the information for the desired channel signal by tracking a carrier frequency of the desired channel signal;
• generating and applying a frequency shift feedback signal to compensate for frequency shifts in the carrier frequency;
• and
• applying a known frequency shift for known frequency offset errors in the carrier frequency;
• wherein the method further comprises:
• processing the digitized coarse channel signal to provide a processed digitized coarse channel signal;
• shifting frequency content of the processed digitized coarse channel signal to baseband based on the known frequency shift and additionally based on the frequency shift feedback signal for analog transmission standards;
• filtering the shifted frequency content of the processed digitized coarse channel signal with a filter stage to produce a filtered signal;
• and
• amplifying the filtered signal to produce an amplified signal.