Real-time audio similarity comparison algorithm

Interference in the Air Traffic Control (ATC) communication band usually comes from FM broadcast stations. To identify sources of the interference, manually scanning a receiver to compare similarity with the sound from the interference is the only method available. This paper presents a similarity comparison method that will make automatic interference identifying possible. The target audios are divided into 3 bands. A subtraction result between two audios of the same band will be decreased if the two audios are similar. To get a final result, at least 2 similar results from 3 bands will be considered positive. The experimental results show 93.42% of the right positive from 380 comparisons and 0.38% of the false positive from 3420 comparisons.