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arXiv · 2603.07285

Fast and Flexible Audio Bandwidth Extension via Vocos

Yatharth Sharma
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Abstract

We propose a Vocos-based bandwidth extension model that enhances audio at 8-48 kHz by generating missing high-frequency content. Inputs are resampled to 48 kHz and processed by a neural vocoder backbone, enabling a single network to support arbitrary upsampling ratios. A lightweight Linkwitz-Riley-inspired refiner merges the original low band with the generated high frequencies via a smooth crossover. On validation, the model achieves competitive log-spectral distance while running at a real-time factor of 0.0001 on an NVIDIA A100 GPU and 0.0053 on an 8-core CPU, demonstrating practical, high-quality BWE at extreme throughput.

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Yatharth Sharma. 2026-03-07. Fast and Flexible Audio Bandwidth Extension via Vocos. https://arxiv.org/abs/2603.07285

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