ACOUSTIC NOISE GENERATOR Russian patent published in 2013 - IPC H03B29/00 G10K11/178 

FIELD: physics.

SUBSTANCE: acoustic noise generator includes a control unit, a display unit, an inspection unit, a power supply and battery charge unit, a battery, a low-frequency signal generator and rotation actuating unit, wherein the low-frequency signal generator is in form of a cylindrical housing, on the inner surface of which there are uniform protrusions; a rod is placed in the housing in line with the axis of the housing, with the possibility of rotation, where the same ends of bearing elements are rigidly attached, and the other ends are fitted with first contact elements with the possibility of translational displacement thereof along the bearing elements and with the possibility of interaction with protrusions of the housing; on the outer surface of the housing there are uniformly arranged second contact elements, with the possibility of interaction thereof with the housing, wherein the rod of the low-frequency signal generator is kinematically connected to the rotation actuating element.

EFFECT: enabling generation of a low-frequency signal with a wide frequency range and improved propagation characteristics.

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