Audio signal processing method and apparatus
US7822496B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2003 |
| Grant date | Oct 26, 2010 |
| Priority date | — |
| Expiry date | Jan 30, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2430/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An audio signal processing method and apparatus in which the apparatus includes a plurality of digital filters, each supplied with an audio signal, and a speaker array. Outputs from the digital filters are supplied to speakers included in the speaker array to form a sound field. A predetermined delay time is set in each of the digital filters, to thereby form, in the sound field, a point where the sound pressure is higher than in the surrounding and a point where the sound pressure is lower than in the surrounding. A low-pass filter characteristic is given to the frequency response of the digital filters and a pseudo pulse train is used to enhance the setting resolution of the delay time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.