Device for simultaneous modulation and amplification of low-frequency sounds

Abstract

A device for simultaneously modulating and amplifying low frequency sounds which comprises a tubular member having an axial bore extending a distance interiorly of the inlet end thereof and tapering to a reduced axial bore in said tubular member. A generally perpendicular passageway in said tubular member intersects said reduced axial bore, the top wall of which terminates adjacent to said intersection and the bottom wall of which extends past said intersection, said extended portion being deflected a finite angle relative to the normal axial flow. The tubular member is received by a sleeve, and a first baffle flared in the direction of the flow is angularly disposed relative to said sleeve to define a first passageway in said tubular member. A second baffle in spaced relation to the first baffles is also angularly disposed relative to the first baffle and also angularly disposed relative to the sleeve to define a second passageway in said tubular member such that the area of the second passageway is greater than the area of the first passageway. A receptor tube is provided at the outlet end of said tubular member engaged with said sleeve, said receptor tube being generally flared in the direction of flow. A signal output transmitting member is attached at the end of the receptor tube for transmitting the amplified sound to an external receiver. An orifice is provided in said sleeve intermediate the receptor tube and the second baffles for the passage of the gases which do not substantially enter the receptor tube.