Investigation on latency issues and objective measurements of non-linear blind bandwidth extension

This paper investigates the algorithmic latency of non-learning blind bandwidth extension (BWE) approaches, and evaluates their quality with objective measurements. BWE methods are regarded as methods for restoring high-frequency losses caused by band limits. To satisfy the restriction and provide high-quality sound, low-latency BWE techniques are required. This paper focuses on the non-learning blind BWE methods, such as spectral shifting-based approaches and non-linear function based BWE (N-BWE). The results proved that the N-BWE method can be performed with low-latency.