Thin-wall multi-concentric cylinder speaker enclosure with audio amplifier tunable to listening room
US5920633A · kind A · utility
Inventor
Key dates
| Filing date | Feb 12, 1996 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Feb 12, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S7/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An acoustic transmission line speaker enclosure with concentric cylindrical structures establishes acoustic coupling between a rear-traveling sound wave and a surrounding air mass. Inherent rigidity or high bending resistance of the cylindrical structure allows use of very thin walled cylinders without a massive and large overall enclosure. An audio amplifier tunable to a listening room removes very low narrow frequency band components of an audio signal. Listening room cavity resonance is measured by injecting a frequency-varying sound wave into the listening room while detecting peak sound energy within the room. The filter the eliminates from audio signal frequencies associated with listening room cavity resonance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.