Servo valve loudspeaker

A device for producing sound of high intensity comprising an air flow conduit in the form of a continuous loop, means for providing a flow of air at high velocity around said loop, a pair of opposed ports in said conduit open to the exterior, rotary valve means for directing a positive flow of air toward one port while directing a negative flow of air at the other port, said rotary valve means being rotatable in both directions to alternate the direction of air flow and thus to produce sound, and electromechanical transducer means connected to said rotary valve means for operation thereof in response to an electrical audio signal.

A servo valve loudspeaker capable of producing high intensity sound in response to an audio signal over a low frequency range, said loudspeaker comprising an air flow conduit in the form of a continuous loop, means in said conduit to create a continuous flow of air around said loop at a velocity greater than 10 feet per second and a pressure of less than 0.2 PSIG, a pair of opposed sound emitting ports in said conduit, vane means disposed between said ports operative to rotate back and forth around an axis for adjustably directing air flow in the conduit outwardly through one port while diverting air flow inwardly from the other port, and means for rotating said vane means in proportion to the frequency and amplitude of said audio signal to produce sound.