| 摘要 |
FIELD: noise protection devices. ^ SUBSTANCE: invention relates noise protection devices. Proposed active-protection noise device comprises pressure receiver 2, preamplifier 3 with controlled transmission ratio, compensator 4, inverting amplifier 5, radiator, auxiliary pressure receiver 7 and control voltage shaper 8. Auxiliary pressure receiver is arranged shifted relative to the primary one, the shift magnitude from the formula TADëÑ3äs, TAD=L/s, where TAD is the output signal advance magnitude, äs is the preamplifier control circuit time constant, L is the shift of auxiliary pressure receiver relative to the main one, s is sound velocity in air. ^ EFFECT: higher efficiency and stability. ^ 2 dwg |
