CODEWITHSUNDEEP
signal-processingaudio
EvilDuck
EvilDuck

Reputation: 4436

Match a sound in recorded audio stream

I have a PCM stream incoming from the microphone. I am analyzing short chunks (Java language) of it to detect short spikes in sound loudness (amplitude). I have a determined sound that plays periodically and I need to know if detected spike is in fact this sound recorded. I have the PCM for sound played, it's completely determined.

I have no clue where to start, should I perform some comparison in time domain or frequency domain? Would be great if someone could give me some insight on how this is done and where should I dig.

Thanks.

Upvotes: 0

Views: 229

Answers (1)

Bjorn Roche
Bjorn Roche

Reputation: 11469

It sounds like you want to compare an incoming set of pulses to a references set of pulses. Cross-correlation is probably what you want to use. You may need to precondition your data first, eg create an envelope instead of using raw data, or the cross-correlation may fail unless the match is perfect.

Upvotes: 1

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