Automatic sound field correcting device and computer program therefor
US7489784B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 2004 |
| Grant date | Feb 10, 2009 |
| Priority date | — |
| Expiry date | Jul 11, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S7/307
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An automatic sound field correcting device executes a signal process to the plurality of audio signals on respective correspondent signal transmission paths, and outputs them to a plurality of correspondent speakers to correct sound characteristics on the respective signal transmission paths. Namely, a measurement signal is supplied to each signal transmission path, and a measurement sound corresponding to it is outputted from the speaker to a sound space. The outputted measurement sound is detected as a detecting signal. The frequency characteristic of the audio signal on each signal transmission path is corrected by an equalizer, and a gain value of the equalizer is determined by a correction amount determining unit. A frequency characteristics correction is performed predetermined times. At a first correction, the correction amount determining unit determines the correction amount by performing a frequency analysis, based on the detecting signal, i.e. base on the detecting signal corresponding to the measurement sound actually outputted to the sound space. On the contrary, at and after a second correction, the correction amount determining unit determines the correction amount b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.