FSK receiver

摘要

In an FSK receiver according to the present invention, a correction operation for a DC offset component is performed based on a maximum value and a minimum value of a demodulation signal. If a difference between the maximum and minimum values is less than a predetermined threshold value TH1, the correction operation is halted. Thus, the FSK receiver can rapidly perform an appropriate offset removal from a multi-level FSK signal.

主权项

1. An FSK receiver comprising:
a correction section operable to perform correction of a DC offset component based on a median value of a maximum value and a minimum value of a demodulation signal obtained by demodulating an n-ary coded FSK signal (where n is an integer of 3 or more); a calculation section operable to calculate a threshold TH1 which is greater than (a maximum frequency deviation−a minimum frequency deviation)×(n−2)/(n−1); and a first correction control section operable, when a difference between the maximum and minimum values is less than the threshold value TH1 calculated by the calculation section, to halt the correction operation by the correction section.