Deep Learning, Artificial Intelligence, Heart Sounds, Sound Classification, Mfcc.
and the second differences of MFCC. The first difference coefficients of MFCC (ΔMFCC) is: where k=2. The second difference MFCC parameters (Δ2MFCC) is: A 39 dimensional feature vector is obtained for further feature learning through the proposed CRNN model. 2. CRNN and PRCNN Models 2.1. CRNN CRNN 3