Interband Mutual Information in Blind Audio Bandwidth Extension
Bandwidth extension schemes have received considerable research attention for their ability to perceptually enhance band-limited audio. However, existing schemes do not exploit mutual information between bands or saliency of spectral features. A novel blind scheme is proposed, which preserves harmonicity in the extended spectrum and employs a trained band energy prediction approach. Listening tests show that the proposed scheme is capable of producing higher quality than existing methods and motivates the use of interband mutual information in audio bandwidth extension systems.