Band switching filter and satellite broadcast receiving system u

Details Band switching filter and satellite broadcast receiving system u Band switching filter and satellite broadcast receiving system u

1990-01-02

1992-12-08

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4552001, 455339, 455341, H04B 116, H04B 126

Patent

active

051704986

ABSTRACT:
A band switching filter circuit includes a first filter for filtering an input signal with predetermined characteristics to output a first filtered signal, and a second filter for filtering the first filtered signal output from the first filter with frequency characteristics of a band narrower than that of the frequency characteristics of the first filter to output a second filtered signal. A switching circuit selects the first filtered signal output from the first filter or the second filtered signal output from the second filter in accordance with the level of an input control signal.

REFERENCES:
patent: 4385402 (1983-05-01), Barrs
patent: 4619000 (1986-10-01), Ma
patent: 4736457 (1988-04-01), Kupfer

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