Adaptive filterbanks using scale-dependent nonlinearity for psychoacoustic frequency range extension
US11838732B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 9, 2021 |
| Grant date | Dec 5, 2023 |
| Priority date | — |
| Expiry date | Sep 9, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S2400/07
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system provides for psychoacoustic frequency range extension. The system generates quadrature components from an audio channel, and generates rotated spectral quadrature components by applying a forward transformation that rotates a spectrum of the quadrature components from a standard basis to a rotated basis. In the rotated basis, the system isolates components of the rotated spectral quadrature components at target frequencies, and generates weighted phase-coherent harmonic spectral quadrature components by applying a nonlinearity to the isolated components having a dependence on scale that is subject to constraints. The circuitry generates a harmonic spectral component by applying an inverse transformation that rotates a spectrum of the weighted phase-coherent harmonic spectral quadrature components from the rotated basis to the standard basis. The circuitry combines the harmonic spectral component with frequencies of the audio channel outside of the target frequencies to generate an output channel, and provides the output channel to a speaker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.