Telecommunications – Receiver or analog modulated signal frequency converter – With particular receiver circuit
Reexamination Certificate
2006-05-02
2006-05-02
Urban, Edward F. (Department: 2685)
Telecommunications
Receiver or analog modulated signal frequency converter
With particular receiver circuit
C455S339000, C455S307000, C455S125000
Reexamination Certificate
active
07039385
ABSTRACT:
A radio has a tunable bandpass filter that is tuned by apparatus within the radio. A reference generator generates a reference signal for use in tuning the tunable bandpass filter. The tunable bandpass filter receives the reference signal and provides a filter output signal. A digital signal processing and control processor is connected to the tunable bandpass filter to receive the filter output signal. The digital signal processing and control processor has a phase comparison function that provides a phase error metric from the filter output signal. The digital signal processing and control processor tunes the tunable bandpass filter to provide a desired phase error metric signal thereby tuning the tunable bandpass filter to the desired center frequency. The digital signal processing and control processor stores tunable filter parameters for the desired center frequency. The tuning process may be repeated for several desired center frequencies of the tunable bandpass filter.
REFERENCES:
patent: 5949832 (1999-09-01), Liebetreu et al.
patent: 6266522 (2001-07-01), Holden et al.
patent: 6377788 (2002-04-01), Elder et al.
patent: 6545559 (2003-04-01), Cullbom et al.
patent: 6781474 (2004-08-01), Douziech et al.
patent: 2002/0068541 (2002-06-01), Helio et al.
Hoffmann Theodore J.
Mulbrook Mark M.
Eppele Kyle
Haroon Adeel
Jensen Nathan O.
Rockwell Collins, Inc.
Urban Edward F.
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