Filtering of a receive frequency band

Details Filtering of a receive frequency band Filtering of a receive frequency band

2005-12-13

2005-12-13

Trinh, Sonny (Department: 2687)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S307000, C455S192100

Reexamination Certificate

active

06975847

ABSTRACT:
The invention relates to the filtering of a subfrequency band out of a receive frequency band, in which a carrier frequency for prefiltering the receive frequency band and an intermediate frequency for demodulating the frequency band filtered out during the prefiltering and for generating a frequency baseband are inserted into the signal propagation path, in which the desired subfrequency band is filtered out of the frequency baseband by a post-filtering and in which the carrier frequency, the intermediate frequency and the post-filtering are matched to one another.

REFERENCES:
patent: 5604746 (1997-02-01), Oto
patent: 5619536 (1997-04-01), Gourgue
patent: 5748623 (1998-05-01), Sawahashi et al.
patent: 5894499 (1999-04-01), Katayama et al.
patent: 6043721 (2000-03-01), Nagode et al.
patent: 6115593 (2000-09-01), Alinikula et al.
patent: 6275540 (2001-08-01), Barrett et al.

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