Pulse or digital communications – Receivers – Automatic frequency control
Reexamination Certificate
2007-12-14
2011-10-25
Flores, Leon (Department: 2611)
Pulse or digital communications
Receivers
Automatic frequency control
C375S316000, C375S324000, C375S340000
Reexamination Certificate
active
08045656
ABSTRACT:
In one embodiment, the present invention includes a digital mixer to receive and digitally mix incoming weather band radio data with a control signal, a digital demodulator to demodulate the data to obtain a demodulated signal, and a digital feedback loop coupled between the demodulator and the digital mixer. The digital feedback loop includes a loop filter to receive the demodulated signal and to generate a filtered output and a fine tune controller to receive the filtered output and a frequency control signal and to generate the control signal based on them. In this way, audible artifacts caused by a frequency step change occurring in an analog front end to which the digital circuitry is coupled can be reduced or removed.
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Flores Leon
Silicon Laboratories Inc.
Trop Pruner & Hu P.C.
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