US 12,587,785 B2 · Adaptive filterbanks using scale-dependent nonlinearity for psychoacoustic frequency range extension

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.

Claims25

Dependent claims

A system, comprising:

a circuitry configured to:
receive an audio channel;
generate a harmonic spectral component having different frequencies from a set of target frequencies of the audio channel that produces a psychoacoustic impression of frequencies of the set of target frequencies when rendered by an audio rendering device, by applying a nonlinearity subject to scale-dependent constraints to components of the audio channel corresponding to the set of target frequencies;
and
combine the harmonic spectral component with frequencies of the audio channel outside of the set of target frequencies to generate an output channel to be rendered by the audio rendering device.

2 more elements

A non-transitory computer readable medium comprising stored instructions that, when executed by at least one processor, configure the at least one processor to:

receive an audio channel;
generate a harmonic spectral component having different frequencies from a set of target frequencies of the audio channel that produces a psychoacoustic impression of frequencies of the set of target frequencies when rendered by an audio rendering device, by applying a nonlinearity subject to scale-dependent constraints to components of the audio channel corresponding to the set of target frequencies;
and
combine the harmonic spectral component with frequencies of the audio channel outside of the set of target frequencies to generate an output channel to be rendered by the audio rendering device.

1 more element

Dependencies are inferred from the claim text.

Adaptive filterbanks using scale-dependent nonlinearity for psychoacoustic frequency range extension

Life of this patent

Adaptive filterbanks using scale-dependent nonlinearity for psychoacoustic frequency range extension

Life of this patent

Abstract

Claims25