Radio receiver having a variable bandwidth IF filter and...

Details Radio receiver having a variable bandwidth IF filter and... Radio receiver having a variable bandwidth IF filter and...

2005-10-18

2005-10-18

Nguyen, Duc M. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S303000, C455S306000, C455S307000, C455S340000, C455S133000, C455S277200

Reexamination Certificate

active

06957054

ABSTRACT:
A radio receiver (100) has an IF (intermediate frequency) filter (200) for automatically adjusting its intermediate frequency. The filter (200) includes a filter bank (304), an accumulative sub-band formation (322) and an accumulative sub-band power estimator/switch control (324). The filter bank (304) generates sub-bands, each sub-band having a predetermined frequency range. The accumulative sub-band formation (322) selectively sums the sub-bands to provide lowpass filters having incrementally increasing bandwidth. Power estimates of the lowpass filters are used to determine which lowpass filter output is appropriate for adjacent station interference. Also, if there is no adjacent station interference, the IF filter (200) selects the appropriate filter output depending on the signal strength of the desired station.

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Vaidyanathan, “Multirate Systems and Filter Banks,” Prentice Hall P T R, Section 4.6, Chapter 4, pp. 151-166 (1993).

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