Algorithm 1. Pseudocode of data length normalization.

1: IF the length of the recording is greater than 9000 samples

2: Chop recording into 9000 samples with 50% overlap between segments

3: IF the length of the recording is less than 9000 samples

4: DATA: = copy the recording

5: Append DATA in the back of the recording

6: DO step 5 until the appended recording reaches 9000 samples

7: IF the length of the recording is equal to 9000 samples

8: Preserve the recording