Digital signal receiver with FM interference elimination capability

A digital signal receiver for eliminating FM interference in a received digital baseband signal, which appears on at least one adjacent route sharing the same frequency band, said receiver comprising first error detector means responsive to the received baseband signal for giving an error signal representing a difference between said baseband signal and a discriminated transmission code;

• phase synchronizing means responsive to said first error detector means for producing an output signal which is synchronized with a complex value output of the first error detector means;
• coefficient circuit means responsive to said phase synchronizing means for multiplying the output of the synchronizing means by a complex coefficient;
• subtractor means responsive to said coefficient circuit means for subtracting the output of the coefficient circuit from said baseband signal;
• second error detector means responsive to said subtractor means for giving a second error signal representing the difference between the output of said subtractor means and a transmission code discriminated from the output of the subtractor;
• and a control circuit means for varying the complex coefficient of the coefficient circuit means based on the correlation between the output of the second error detector means and the output of the synchronizing means.