Paging receiver with automatic frequency control

A paging receiver, comprising:

• means for receiving a radio frequency paging signal including at least a pager address;
• means for comparing the pager address included in the paging signal to at least one address stored in a memory;
• an automatic frequency controller responsive the comparing
• means for converting the radio frequency paging signal to an intermediate frequency signal and
• for determining the frequency of the intermediate frequency signal when the paging address included in the paging signal correlates to the at least one address stored in the memory, and including
• means for determining a frequency error from the received paging signal and calculating an off-set value based upon the received signal;
• and
• adjustable filter means for varying the filtering of the paging signal based on the calculated frequency off-set value when the paging address included in the paging signal correlates to the at least one address stored in the memory;
• and
• annunciation means responsive to the comparing means for providing an indication of receiving the paging signal when the paging address included in the paging signal correlates to the at least one address stored in the memory.

In a paging receiver having an automatic frequency controller with an adjustable frequency oscillator, a method comprising the steps of:

• (a) receiving a paging signal including a paging receiver address;
• (b) comparing the paging receiver address included in the paging signal to at least one address stored in memory;
• (c) determining the frequency of the paging signal when the paging receiver address included in the paging signal correlates to at least one address stored in the memory and
• calculating a correction factor based upon the frequency of the paging signal;
• (d) varying the frequency of an adjustable frequency oscillator in accordance with the correction factor when the paging receiver address included in the paging signal correlates to at least one address stored in the memory;
• and
• (e) providing an indication of receipt of the paging signal when the paging receiver address included in the paging signal correlates to at least one address stored in the memory.

A paging receiver, comprising:

• means for receiving and synchronizing to a paging signal including a paging receiver address;
• means for comparing the paging receiver address included in the paging signal to at least one address stored in a memory;
• an automatic frequency controller responsive to the comparing means
• for counting the frequency of the received signal when the paging receiver address included in the paging signal correlates to the at least one address stored in the memory, and for determining a frequency error of the received paging signal and a correction factor;
• oscillator control means for adjusting an oscillator frequency in response to the correction factor when the paging receiver address included in the paging signal correlates to the at least one address stored in the memory, and for adjusting the oscillator frequency in response to a nominal value when synchronization to the paging signal is not achieved or when the paging receiver address included in the paging signal does not correlate to any of the addresses stored in the memory;
• and
• annunciation means responsive to the comparing means for providing an indication of receiving the paging signal when the paging address included in the paging signal correlates to the at least one address stored in the memory.