FIELD: fighting the injurious rodents, insects and some kinds of birds. SUBSTANCE: method involves repelling biological creatures by using acoustic signals ranging from 12 to 100 kHz, with amplitude modulation frequency not exceeding 100 Hz and frequency modulation changing rate not exceeding 100 Hz/sec. EFFECT: increased efficiency by increased repellent signal habituation time, wider operational capabilities. 2 cl, 1 dwg
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Authors
Dates
1997-07-20—Published
1995-08-15—Filed