Sampling-Frequency-Independent Universal Sound Separation
This addresses the need for a universal source separator that works under varying recording conditions, such as different sampling frequencies, which is incremental as it builds on existing USS methods by adding SF independence.
The paper tackles the problem of universal sound separation (USS) across untrained sampling frequencies (SFs) by proposing an SF-independent extension of the SuDoRM-RF network, which uses SFI convolutional layers to handle various SFs without performance degradation from resampling.
This paper proposes a universal sound separation (USS) method capable of handling untrained sampling frequencies (SFs). The USS aims at separating arbitrary sources of different types and can be the key technique to realize a source separator that can be universally used as a preprocessor for any downstream tasks. To realize a universal source separator, there are two essential properties: universalities with respect to source types and recording conditions. The former property has been studied in the USS literature, which has greatly increased the number of source types that can be handled by a single neural network. However, the latter property (e.g., SF) has received less attention despite its necessity. Since the SF varies widely depending on the downstream tasks, the universal source separator must handle a wide variety of SFs. In this paper, to encompass the two properties, we propose an SF-independent (SFI) extension of a computationally efficient USS network, SuDoRM-RF. The proposed network uses our previously proposed SFI convolutional layers, which can handle various SFs by generating convolutional kernels in accordance with an input SF. Experiments show that signal resampling can degrade the USS performance and the proposed method works more consistently than signal-resampling-based methods for various SFs.