| 摘要 |
PROBLEM TO BE SOLVED: To reduce the influence of adjacent waves, to improve reception sensitivity and to enlarge the allowability of the frequency offset of the oscillation frequency of a local oscillator and the carrier wave frequency of reception signals. SOLUTION: The signal levels of reception signals in different plural frequency bands are detected by a first electric field strength detection means 15 and a second electric field strength detection means 16 and whether or not the adjacent waves are present is detected based on the output by an adjacent wave detection means 17. Corresponding to the presence/absence of the adjacent waves, by a base band filter control means 18, filter control signals 19 are outputted to a first I low-pass filter 9a and a first Q low-pass filter 10a and the low band cutoff frequency of the first I low-pass filter 9a and the first Q low-pass filter 10a is changeover controlled.
|
