A Multi-Branch Hierarchy-Aware Framework for Heterogeneous Audio Classification

• URL: http://arxiv.org/abs/2607.01974v1
• Date: Thu, 02 Jul 2026 10:08:24 GMT
• Title: A Multi-Branch Hierarchy-Aware Framework for Heterogeneous Audio Classification
• Abstract summary: This report describes our system for Task 1 of the DCASE 2026 Challenge, which aims to classify heterogeneous audio recordings.<n>Our system is built on CLAP-based audio-text representations and is improved along three strategies.<n>Among the acoustic features considered, the log-STFT branch provides the strongest single-model performance.
• Score: 9.384278545503735
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: This technical report describes our system for Task 1 of the DCASE 2026 Challenge, which aims to classify heterogeneous audio recordings according to the Broad Sound Taxonomy (BST). The task requires both accurate second-level prediction and consistency with the top-level taxonomy. Our system is built on CLAP-based audio-text representations and is improved along three strategies: expanding the training set with a filtered subset of BSD35k, enhancing acoustic modeling with feature-specific branches, and refining predictions using hierarchy-aware classifiers and KNN-based post-processing. Among the acoustic features considered, the log-STFT branch provides the strongest single-model performance. With KNN-based post-processing, our best single system achieves a hierarchical F1 score (Hier. F1) of 80.84% on the BSD10k-v1.2 set under the same evaluation protocol as the baseline. We further construct ensemble systems by combining models with complementary acoustic features and classification heads, achieving Hier. F1 scores of 81.25% and 81.18%, respectively.

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