Mobile sound field correcting device
US4622691A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 1985 |
| Grant date | Nov 11, 1986 |
| Priority date | — |
| Expiry date | May 31, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S7/302
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A mobile sound field correcting system for correcting an acoustic characteristic in a vehicle sound field formed by direct waves radiated from loudspeakers and reflected waves thereof providing satisfactory acoustic characteristics for different vehicles and different listening points within a vehicle. A first correcting means corrects a power spectrum of each loudspeaker in a frequency range above a frequency at which a decrease of starts of the power spectrum in a high-frequency range of each loudspeaker. Second correcting means corrects for irregularities in the frequency characteristic of each loudspeaker caused by interference of the direct waves with the reflected waves in a frequency lower than the drop-off frequency of this power spectrum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.