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AssigneeFreescale Semiconductor, Inc.
InventorMichael May
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The present invention provides a method to adjustably sample pilot tracking module within a handheld audio system that includes both an error sensing module and a feedback module that track timing errors in sampling a first digitized signal having a first data rate to produce a second digitized signal having a second data rate. This involves processing the second digitized signal to produce an output signal having a timing component contained therein. An error sensing module determines a timing error between the timing component and a digitized reference oscillation. Then this timing error is used to produce a feedback signal that is applied to the sample timing of the first digitized signal. This allows the second digitized signal to be processed using a time domain associated with the second data rate, wherein these signals may have different time domains. The error sensing module includes a mixing module, filtering module, and comparator. The feedback module includes a state variable filter and a sigma-delta modulator. The mixing module receives a reference timing signal and a composite signal (produced by demodulating the second signal). Comparing these signals mix produces a timing error signal which is filtered and provided to the comparator to produce a timing correction output. The state variable filter processes the timing correction output to provide an input to the sigma-delta modulator. The sigma-delta modulator quantizes the timing correction to produce a timing error correction signal used to adjust sampling of the received signal.
A module operable to process digitized signals, the module comprises:
A feedback method, comprising:
A pilot tracking module operable to produce a feedback signal, wherein the error sensing module comprises:
A module operable to process frequency modulated (FM) digitized near baseband signals, the module comprises:
Dependencies are inferred from the claim text.