Patent ID: 7043026

Claim:
An AM neighboring interference removing circuit for removing AM neighboring interference of an AM receiver, comprising: a first local oscillator for generating an oscillation output having a frequency of fp1; a second local oscillator for generating an oscillation output having a frequency of fp2; a first multiplier for multiplying an AM stereo modulation wave desired to be received, by the oscillation output from said first local oscillator; a second multiplier for multiplying the AM stereo modulation wave desired to be received, by the oscillation output from said second local oscillator; a first low-pass filter for removing high frequency components contained in an output of said first multiplier; a second low-pass filter for removing high frequency components contained in an output of said second multiplier; a subtractor for substracting an output of said second low-pass filter from an output of said first low-pass filter; and a low-pass filter for receiving an output of said subtractor and having a cut-off frequency of fc/2, wherein fc is a carrier frequency of an interference AM modulation wave causing neighboring interference, fp1>fp2, and fp1 fc=fc−fp2.