Electrical audio signal processing systems and devices – Sound or noise masking
Patent
1989-11-02
1991-07-30
Isen, Forester W.
Electrical audio signal processing systems and devices
Sound or noise masking
380 6, H04R 302
Patent
active
050365428
ABSTRACT:
An audio surveillance discouragement apparatus or system comprising, at least, first generating device, second generating device, first speaker and second speaker. The first speaker is coupled to the first generating device, and the second speaker is coupled to the second generating device. The first generating device generates a first signal having a plurality of voice signals, synthesized vocal signals, and dummy intelligence signals, mixed with an audio frequency spectrum, which is approximately divided into a plurality of frequency bands with each of the frequency bands randomly and independently increasing or decreasing in volume, and may have a 20 dB pocket near 500 Hz. The second generating device generates a second signal which is nonsynchronous with the first signal. The second signal is identical in construction to the first signal, but is unique in identity and characteristics. Additional signals are constructed in the same manner and generated in the same manner. The first speaker radiates the first signal. The second speaker radiates the second signal. Additional speakers radiate additional signals. All speakers are located a distance from each other for spatially mixing the radiated signals.
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Kehoe Brian D.
Matchett Noel D.
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