Acoustic sound system for a room

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system

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H04R 300, H04R 2700

Patent

active

048378291

ABSTRACT:
A modular acoustic sound system for a room for two-way conversations without the need for switching. The system includes pairs of microphones each connected to a phase shifter so that in-phase signals inputted to the microphone pair are shifted 180.degree. apart. The out-of-phase signals are input to a summing circuit having an amplified output which drives a plurality of loudspeakers. A portion of the audible loudspeaker outputs enters the microphone pair, is phase shifted, and cancelled out in the summing amplifier. Any number of loudspeaker/microphone pairs operate in the system and any microphone may be spoken into to drive every loudspeaker.

REFERENCES:
patent: 2177769 (1939-10-01), Erickson
patent: 3256391 (1966-06-01), Boner
patent: 3922488 (1975-11-01), Gabr
patent: 3992586 (1976-11-01), Jaffe
patent: 4088835 (1978-05-01), Thurmond et al.
patent: 4184048 (1980-01-01), Alcaide
patent: 4485272 (1984-11-01), Duong et al.
A Sound Reinforcement System for Multiple Conference Rooms, from the Journal of the Audio Engineering Society, 1969, by: Melvin S. Draper, Seattle, Washington, pp. 184-196.
Microphones Electrically Out of Phase, from Microphones: Design and Application, by: Burroughs, Sagamore Pub. Co., Plainview, New York, 1974, pp. 99-108.

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