Systems and methods for extracting and digitizing phase and frequency information from an analog signal

A radiotelephone, comprising:

• a transmitter for transmitting radio signals from the radiotelephone;
• a receiver for receiving radio signals received by the radiotelephone;
• an antenna system;
• a user interface;
• and
• means for digitally representing an adjusted frequency value;
• wherein said receiver further comprises:
• a frequency discriminator responsive to said received radio signals which periodically determines the frequency of said received radio signals so as to provide a first frequency value;
• a phase discriminator responsive to said received radio signals which periodically determines the phase of said received radio signals so as to provide a phase value;
• and
• a control network operably associated with said frequency discriminator and said phase discriminator which adjusts said first frequency value so as to provide the adjusted frequency value, wherein said control network comprises:
• an error estimator which produces an error signal based on the first frequency value and the phase value;
• and
• adjusting means responsive to said error signal for adjusting the amplitude of the first frequency value so as to provide said adjusted frequency value.

A system for determining and digitally representing the phase of an input signal relative to the phase of a reference signal, comprising:

• a frequency discriminator responsive to said input signal which periodically determines a first frequency value corresponding to the frequency of said input signal;
• an analog-to-digital converter operably associated with said frequency discriminator so as to provide a digitized first frequency value;
• a phase digitizer responsive to said input signal which periodically determines a digitized phase value corresponding to the phase of said input signal;
• a phase-to-frequency converter operably associated with said phase digitizer so as to convert said digitized phase value to provide a digitized second frequency value;
• an error estimator which produces an error signal based on said digitized first frequency value and said digitized second frequency value;
• adjusting means for adjusting said digitized first frequency value based on said error signal;
• and
• a frequency-to-phase converter coupled to the output of said adjusting means.

A system for determining and digitally representing the frequency of an input signal relative to a reference frequency, comprising:

• a frequency discriminator responsive to said input signal which periodically determines a first frequency value corresponding to the frequency of said input signal;
• an analog-to-digital converter operably associated with said frequency discriminator so as to provide a digitized first frequency value;
• a phase digitizer responsive to said input signal which periodically determines a digitized phase value corresponding to the phase of said input signal;
• a phase-to-frequency converter operably associated with said phase digitizer so as to convert said digitized phase value to provide a digitized second frequency value;
• an error estimator which produces an error signal based on said digitized first frequency value and said digitized second frequency value;
• and
• adjusting means for adjusting said digitized first frequency value based on said error signal.

A method for determining and digitally representing at least one of the phase and frequency of an input signal using a frequency discriminator and a phase discriminator, comprising the steps of:

• generating a first estimate of the frequency of the input signal;
• generating an estimate of the phase of the input signal;
• converting the estimate of the phase into a second estimate of the frequency of the input signal;
• estimating an error in the first estimate of the frequency based on the second estimate of the frequency;
• and
• adjusting the first estimate of the frequency based on the error estimation so as to provide a corrected frequency estimate.