Adjustable bandwidth in a radiotelephone

Details Adjustable bandwidth in a radiotelephone Adjustable bandwidth in a radiotelephone

1991-10-17

1994-04-12

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455266, 455315, H04B 116

Patent

active

053034040

ABSTRACT:
The frequency of a first local oscillator signal (1.LO) is offset in reference to the center frequency of a first bandpass filter (4), and the frequency of a second local oscillator signal (2.LO) is offset in reference to the center frequency of a second bandpass filter (7). The frequency offsets are selected so that only a portion (x, y) of the filter (4, 7) bandwidths (bw, BW) will add to an "imaginary" effective narrow bandwidth (NBW). The amounts of frequency offset are continuously adjustable by programmable controller.

REFERENCES:
patent: 3953802 (1976-04-01), Morris et al.
patent: 4262361 (1981-04-01), Hauer
patent: 4267605 (1981-05-01), Matsuzawa et al.

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