Signal processing apparatus, signal processing method, and signal processing program
US11871211B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2019 |
| Grant date | Jan 9, 2024 |
| Priority date | — |
| Expiry date | Feb 4, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S2400/15
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A signal processing device 1 includes an expansion coefficient calculation unit 11 that, from an outward sound field to be reproduced, calculates a spherical harmonics expansion coefficient for reproducing the sound field; an expansion coefficient conversion unit 12 that converts the calculated spherical harmonics expansion coefficient into a weight factor for superposition of multipole sources; a filter coefficient calculation unit 13 that, from the weight factor, calculates a filter coefficient corresponding to each speaker included in a multipole speaker array, the speaker providing output outwardly; and a convolution operation unit 14 that convolves the filter coefficient corresponding to each speaker into an input acoustic signal to calculate an output acoustic signal for each speaker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.