In this paper, we propose a pixel-based attention (PBA) module for acoustic scene classification (ASC). By performing feature compression on the input spectrogram along the spatial dimension, PBA can obtain the global information of the spectrogram. Besides, PBA applies attention weights to each pixel of each channel through two convolutional layers combined with global information. In addition, the spectrogram applied after the attention weights is multiplied by the gamma coefficient and superimposed with the original spectrogram to obtain more effective spectrogram features for training the network model. Furthermore, this paper implements a convolutional neural network (CNN) based on PBA (PB-CNN) and compares its classification performance on task 1 of Detection and Classification of Acoustic Scenes and Events (DCASE) 2016 Challenge with CNN based on time attention (TB-CNN), CNN based on frequency attention (FB-CNN), and pure CNN. The experimental results show that the proposed PB-CNN achieves the highest accuracy of 89.2% among the four CNNs, 1.9% higher than that of TB-CNN (87.3%), 2.2% higher than that of FB-CNN (86.6%), and 3% higher than that of pure CNN (86.2%). Compared with DCASE 2016’s baseline system, the PB-CNN improved by 12%, and its 89.2% accuracy was the highest among all submitted single models.
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