Receiving circuit for a portable telephone set

Details Receiving circuit for a portable telephone set Receiving circuit for a portable telephone set

1996-07-09

1998-08-11

Au, Amelia

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

455307, H04B 110

Patent

active

057941343

ABSTRACT:
An unnecessary wave suppressing means suppresses unnecessary waves included in a reception high frequency signal in a frequency band that is changed in accordance with a switching signal. The unnecessary wave suppressing means changes the pass band by inserting a notch into a pass band at a range where a signal is to be suppressed, changing the pass band width so as to exclude a suppression band, retaining a plurality of narrow pass bands for respective frequency bands used and switching among those narrow pass bands in accordance with a frequency band of a receiving signal, or continuously changing the pass band by using a tuning filter.

REFERENCES:
patent: 4004105 (1977-01-01), Mizukoshi
patent: 4385402 (1983-05-01), Barrs
patent: 4470138 (1984-09-01), Gutleber
patent: 5499394 (1996-03-01), Kaatz et al.
patent: 5564093 (1996-10-01), Matsumoto

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