Environment Sound Classification using Multiple Feature Channels and Deep Convolutional Neural Networks

--In this paper, we propose a model for the Environment Sound Classification T ask (ESC) that consists of multiple feature channels given as input to a Deep Convolutional Neural Network (CNN). The novelty of the paper lies in using multiple feature channels consisting of Mel-Frequency Cepstral Coefficients (MFCC), Gammatone Frequency Cepstral Coefficients (GFCC), the Constant Q-transform (CQT) and Chromagram. Such multiple features have never been used before for signal or audio processing. Also, we employ a deeper CNN (DCNN) compared to previous models, consisting of 2D separable convolutions working on time and feature domain separately. The model also consists of max pooling layers that downsample time and feature domain separately. We use some data augmentation techniques to further boost performance. Our model is able to achieve state-of- the-art performance on all three benchmark environment sound classification datasets, i.e. the UrbanSound8K (97.35%), T o the best of our knowledge, this is the first time that a single environment sound classification model is able to achieve state-of-the-art results on all three datasets. For ESC-10 and ESC-50 datasets, the accuracy achieved by the proposed model is beyond human accuracy of 95.7% and 81.3% respectively. I NTRODUCTION T HERE are many important applications related to speech and audio processing. One of the most important application is the Environment Sound Classification (ESC) that deals with distinguishing between sounds from the real environment. It is a complex task that involves classifying a sound event into an appropriate class such as siren, dog barking, airplane, people talking etc. This task is quite different compared to Automatic Speech Recognition (ASR) [1], since environment sound features differ drastically from speech sounds. In ASR, speech is converted to text. However, in ESC, there is no such thing as speech, just sounds. So, ESC models are quite different compared to ASR models.