Audio processing apparatus and audio processing method
US10109295B2 · kind B2 · utility
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6Claims
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Key dates
| Filing date | Mar 24, 2017 |
| Grant date | Oct 23, 2018 |
| Priority date | — |
| Expiry date | Mar 24, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0621
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An upper limit of a frequency range of audio indicated by input audio data is detected. A representative point extraction unit downsamples the input audio data to a sampling rate set to be less than or equal to twice the detected upper limit to obtain representative-point audio data. An interpolation processing unit upsamples the representative-point audio data by using a fractal interpolation function (FIF) that uses a mapping function calculated by a mapping function calculation unit, while using the input audio data, if necessary, to generate high-frequency interpolated audio data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.