Universal automatic frequency control for multi-channel receivers
AssigneeSirius XM Radio Inc.
InventorsCarl Scarpa, Robert Joseph Topper
Life of this patent
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Abstract
Systems and methods for performing automatic frequency control are provided. Instead of relying on individual frequency tuners for each channel of a multi-channel receiver system, the present subject matter uses a single frequency tuner for receiving each channel of the multi-channel receiver system. A locked demodulator may be designated as a reference demodulator and frequency offset values associated with the reference demodulator may be applied to other demodulators of the multi-channel receiver. These frequency offset values may be used by individual demodulators of each channel for correcting corresponding frequency offsets.
Claims7
A system comprising:
- a tuner;
- a first demodulator coupled to the tuner;
- a second demodulator couple to the tuner;
- and
- at least one processor coupled to the first and second demodulators;
- wherein the tuner receives a first and a second signal;
- wherein the first demodulator demodulates the first signal;
- wherein the second demodulator demodulates the second signal;
- wherein the at least one processor determines a first frequency offset for the first demodulator;
- and
- wherein when the second demodulator is unable to lock the second signal, at least one processor applies the first frequency offset to the second demodulator.
Dependencies are inferred from the claim text.