The Fifthnet Chroma Extractor

Deep Learning (DL) is commonly used in music processing tasks such as Automatic Chord Recognition (ACR), for which Convolutional Neural Networks (CNNs) are popular tools. Compression of CNNs has become a research topic of interest, focused on post-pruning of learnt networks and development of less expensive network elements. CNNs assemble high level structure in data from small simple patterns. Music signals are often processed in the spectral domain where much known structure is present. We propose the FifthNet, a neural network for chroma-based ACR that incorporates known spectral structures in its design through data manipulation. We find that FifthNet is competitive with popular ACR networks while using only a small fraction of their network parameters.