Adjacent interference removal device

Details Adjacent interference removal device Adjacent interference removal device

2005-01-12

2008-05-06

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S303000, C455S307000, C455S266000, C455S254000

Reexamination Certificate

active

07369836

ABSTRACT:
An adjacent interference removal device capable of providing an improved reception quality. An IF signal Sin having passed through an IF filter having a pass frequency band width of 200 kHz is supplied to a first narrow band filter having a pass frequency band width extending from a center frequency (carrier frequency) of the IF filter to +50 kHz, as well as to a second narrow band filter having a pass frequency band width extending from a center frequency (carrier frequency) of the IF filter to −50 kHz. When an interference signal is contained in a first signal S1outputted from the first narrow band filter but not in a second signal S2outputted from the second narrow band filter, and when an interference signal is contained in a detection signal Sd2generated by detecting the second signal S2in a detector and contained in the second signal S2itself but not contained in the first signal S1,the detection signal Sd1generated by detecting the first signal S1in another detector is outputted by performing a switchover in a signal selecting unit.

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