SIMULATOR OF FISH SOUNDS Russian patent published in 1998 - IPC

FIELD: fish industry. SUBSTANCE: simulator of fish sounds has source of compressed air connected with compressed air accumulation chamber. Successively connected to compressed air accumulation chamber are head-piece and radiating head with radial hole which is closed by elastic collar. Spaces of head-piece and radiating head are connected to each other and with space of compressed air accumulation chamber through relief holes. Also provided is air supply mechanism made up of sleeve with piston which is spring-biased from internal side. For more reliable operation and reaching better similarity between signals emitted by biological objects and artificial sounds, simulator is provided with deformable cylinder made of elastic material. Cylinder embraces head-piece from external side. Head-piece has holes for escape of air below cylinder. Air supply mechanism is installed inside head-piece so that its piston closes hole which makes communicating head-piece space with space of compressed air accumulation chamber. Piston isolates those two spaces until pressure in compressed air accumulation chamber reaches preset value. EFFECT: higher efficiency.