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Boardroom sound reinforcement system

  • US 3,992,586 A
  • Filed: 11/13/1975
  • Issued: 11/16/1976
  • Est. Priority Date: 11/13/1975
  • Status: Expired due to Term
First Claim
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1. A sound reinforcement system for obtaining acoustical gain between a plurality of sound generating locations and a plurality of sound receiving locations separated from one another by a distance wherein at least some of the sound generating and the sound receiving locations are essentially joint comprising at least a pair of speakers positioned at each joint location, the speakers of the pair being driven out of phase with each other to provide an acoustical cancellation zone therebetween, at least one microphone positioned at each joint location, the microphone being positioned in the acoustical cancellation zone of the corresponding speaker pair of that location.

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