Boardroom sound reinforcement system
US3992586A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1975 |
| Grant date | Nov 16, 1976 |
| Priority date | — |
| Expiry date | Nov 13, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R27/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A sound reinforcement system for a meeting room provides improved effective communication between several individuals located at a distance from one another within a room, as around a large conference table in a corporate boardroom, by positioning a pair of speakers driven out of phase with one another at each individual location and positioning a microphone within the acoustical cancellation zone of the corresponding speaker pair. Acoustical gain is further improved by feeding the signal from each microphone to all speaker pairs except the one to which it corresponds and/or by making the level of a signal arising from a speaker pair proportional to its distance from the microphone that picked up that signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.