Speech Command detection in audio file

Lucas asked: 2020-12-31 matlab , signal , signal processing

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Expert Answer

Prashant Kumar answered . 2025-07-12 18:02:52

Here is a sketch of how you can achieve this:

1) Read the contents of the audio file

[audioIn,fs] = audioread('filename.wav');

2) Split the signal into 1-second chunks, with overlap between consecutive chunks. The higher the overlap, the higher your resolution (i.e. how close you will be able to detect where the keyword occured)

y = buffer(audioIn, fs, round(3*fs/4));

3) Convert each chunk (each column of y) to a mel spectrogram, and classify it using the network. Based on the network results, you will get an estimate of where the word occured in your wav file (each chunk advances by 1 sec - overlap, so in the this example, it's ~250 ms.

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