Boardroom sound reinforcement system

Details Boardroom sound reinforcement system Boardroom sound reinforcement system

1975-11-13

1976-11-16

Claffy, Kathleen H.

179 1P, H04R 2700

Patent

active

039925862

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.

REFERENCES:
patent: 1642040 (1927-09-01), McCutchen
patent: 3538254 (1970-11-01), Ancha
Bleazey; J., "Electronic Sound Absorbers," J. of Aud. Eng. Soc., Apr. 1962.

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