Need ideas on how to extract a 30s portion of a wav file and save as a new file

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Benjamin Colbert 2022-5-6

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评论： Rik 2022-5-6

This may be easy but I'm no expert in MatLab. I have a bacth of wav files and I need to extract a 30s sample from each. Example

1.wav - need 1:34-2:04

2.wav - need 5:15 - 5:45

ideally I'd like to run a code which will take each wav file and extract the correct time period according to a pre-generated table and save each snippet as a new wav file (e.g., 1_snip.wav would be the 30secs I need to analyze). Any points in the right direction would be great. Thanks!

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Answer 1

Rik 2022-5-6

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https://ww2.mathworks.cn/matlabcentral/answers/1713125-need-ideas-on-how-to-extract-a-30s-portion-of-a-wav-file-and-save-as-a-new-file#answer_958480

Have you already found a way to read a single wav file? If not, audioread should do what you want.

Remember that the second output is the sampling frequency (in samples per second), so you will have to multiply that by the number of seconds to determine the number of samples you need.

Then you can use audiowrite to create the new file.

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Benjamin Colbert 2022-5-6

Sure, i can use audioread to read in a wav file but how do I then extract the 30sec snippet I want in order to save via audiowrite?

Rik 2022-5-6

You need to convert the time in seconds to samples. You can use the sample frequency output parameter. Simply convert the time marks to seconds and multiply those with Fs. Then you can use those to index the data array.

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