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this is for an application in which passwords are stored in the form of audio inputs . In order to provide user access , the password(in audio form) will be matched with already stored password(audio only) in the database . I wanted to know how to measure the extent of similarity in two audio patterns . the audio patterns can be a clap sequence , knock sequence , whistle etc

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Look up acoustic fingerprint or audio fingerprinting and dynamic-time warping for some basic technologies used to compare audio files.

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You could also take a look at pattern recognition in the time-frequency domain. This would imply to take the entire audio signal and perform time-frequency analysis (finding a pro version of the spectrogram) and analize that as an image. If the two time-frequency representations match for the audio files, it is very likely that they are the same password.

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