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Adaptive Low-frequency Extension Using Auditory Filterbanks

Microspeakers used in mobile devices and PCs have band-limited frequency response, from constraining small drivers in tight enclosures, resulting in the loss of low-frequency playback content. The lack of low-frequencies in turn degrades the audio quality and perceived loudness. A method to overcome this physical limitation is to leverage the auditory phenomena of the missing fundamental; where by synthesizing the harmonic structure decodes the missing fundamental frequency. The proposed approaches employs side-chain processing for synthesizing the harmonics with only dominant portions of the low-frequency signal using critical-band filters. Additionally a parametric filter is used to shape the harmonics. Listening tests reveal that the proposed technique is preferred in terms of both the overall sound quality and the bass-only quality.

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