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search for signal of fixed duration and frequency

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cob
cob am 18 Jun. 2015
Geschlossen: MATLAB Answer Bot am 20 Aug. 2021
Hi , I have an audio signal which i have recorded , i need to determine if inside the recorded signal , i have a smaller signal with duration of 250 ms and frequency of 400 Hz. Which method should i use for it ?
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cob
cob am 24 Jun. 2015
where disappeared the newer comments ?

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Luffy
Luffy am 18 Jun. 2015
Bearbeitet: Luffy am 18 Jun. 2015
Do the fft of the audio signal. You'll get spikes at the frequencies present in your signal.
How to do fft: doc fft.
Doing fft tells you if there is a signal of 400 Hz in your audio,to know the duration pass your audio through a notch filter of 400 Hz

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