Fig. 5From: Efficient bandwidth extension of musical signals using a differentiable harmonic plus noise modelGenerated upper-frequency band using the proposed models and the baselines, for one frame of a synthetic signal containing four notes: C#5 (\(\approx 554\) Hz), D#5 (\(\approx 587\) Hz), D5 (\(\approx 622\) Hz), and F#6 (\(\approx 1479\) Hz). The vertical line shows the limit between the low and high bandsBack to article page