Receiving circuit for a portable telephone set

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

H - Electricity

04

B

H04B 1/10 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2180910

An unnecessary wave suppressing means suppresses unnecessary waves included in a received 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 bandwidth so as to exclude a suppression band, retaining a plurality of narrow pass bands for respective frequency bands used, and either 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.

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