ACOUSTIC TRANSFORMABLE SYSTEM Russian patent published in 2011 - IPC H04R1/28 

FIELD: physics.

SUBSTANCE: acoustic transformable system includes a set of tubular sections of temporary structures mated by end faces, fixed by fastening elements, wherein the set of tubular sections includes a frontal, closing, redirected and intermediate sections; on the outer and inner surface of the redirected sections there are reinforcement ribs with trapezoidal grooves whose inner surface is fitted with resilient seals; the redirected, frontal and closing sections are an axially transformable, telescopic structure in which the number of intermediate sections per unit is less than the number of redirected sections; the fastening elements tie the frontal and closing sections and are fitted with locking devices and the closing section has phase-inverting channels.

EFFECT: high sound pressure at low frequencies, reduced variation in frequency response, reduced undesirable vibrations of the acoustic design, reduced size of the device during transportation and storage, increase in internal volume of the acoustic design in working state.

5 dwg