Diversity system for noise-masking

Details Diversity system for noise-masking Diversity system for noise-masking

1974-12-19

1976-09-14

Claffy, Kathleen H.

H04R 300

Patent

active

039808270

ABSTRACT:
Masking-noise speakers are positioned in an array of lines and rows to direct masking noise into a space. Two separate noise generators provide noise signals respectively to two equalizer-amplifiers which provide their signals respectively to first and second narrow band equalizers. These channel signals are respectively delivered through power amplifiers to first and second sets of speakers in the speaker array. The first and second channel signals are combined to produce a third channel signal, are power amplified, and delivered to a third set of speakers in the array so that no two adjacent speakers on any line or row are powered by the same noise signal. In a modified arrangement, the combination of the first and second channel signals is made after power amplification.

REFERENCES:
patent: 3138667 (1964-06-01), Avedon
patent: 3280258 (1966-10-01), Curtis
patent: 3308237 (1967-03-01), Novak
patent: 3478167 (1969-10-01), Sorkin
patent: 3567863 (1971-03-01), Morrissey
The Journal of the Acoustical Society of America, vol. 34, No. 8, Aug. 1962, by Wallace Dean, III, pp. 1039-1044.

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