Combining STFT, mel-scale spectrogram, and WSST time-frequency representations with CNNs achieved ≈99% accuracy in classifying heart sounds, compared to ≈85.9% for individual representations.
Does combining multiple time-frequency representations improve the accuracy of deep-learning models in classifying heart sounds?
Combining multiple time-frequency representations significantly improves the accuracy of deep-learning models for automated heart sound classification.
Tasa de eventos absoluta: 99% vs 85.9%
Worldwide, heart disease is the leading cause of mortality. Cardiac auscultation, when conducted by a trained professional, is a non-invasive, cost-effective, and readily available method for the initial assessment of cardiac health. Automated heart sound analysis offers a promising and accessible approach to supporting cardiac diagnosis. This work introduces a novel method for classifying heart sounds as normal or abnormal by leveraging time-frequency representations. Our approach combines three distinct time-frequency representations—short-time Fourier transform (STFT), mel-scale spectrogram, and wavelet synchrosqueezed transform (WSST)—to create images that enhance classification performance. These images are used to train five convolutional neural networks (CNNs): AlexNet, VGG-16, ResNet50, a CNN specialized in STFT images, and our proposed CNN model. The method was trained and tested using three public heart sound datasets: PhysioNet/CinC Challenge 2016, CirCor DigiScope Phonocardiogram Dataset 2022, and another open database. While individual representations achieve maximum accuracy of ≈85.9%, combining STFT, mel, and WSST boosts accuracy to ≈99%. By integrating complementary time-frequency features, our approach demonstrates robust heart sound analysis, achieving consistent classification performance across diverse CNN architectures, thus ensuring reliability and generalizability.
Orozco-Reyes et al. (Mon,) conducted a other in Heart disease (normal vs abnormal heart sounds). Combined time-frequency representations (STFT, mel-scale spectrogram, WSST) with CNNs vs. Individual time-frequency representations was evaluated on Classification accuracy for normal vs abnormal heart sounds. Combining STFT, mel-scale spectrogram, and WSST time-frequency representations with CNNs achieved ≈99% accuracy in classifying heart sounds, compared to ≈85.9% for individual representations.