Accession Number : ADD014472

Title :   Double Valve Mechanism for an Acoustic Modulator.

Descriptive Note : Patent, Filed 23 Aug 89, patented 16 Jan 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Anderson, Robert B

Report Date : 16 Jan 1990

Pagination or Media Count : 9

Abstract : A double valve mechanism which is the functioning part of an acoustic modulator which regulates airflow by creating air pressure variations. A pair of cylindrical shaped members, each of which has a plurality of elongated ports therein move relative to each other through electro-magnetic excitation. The motion of the two cylindrical shaped members is reciprocating causing the ports to first open and then close, thereby modulating the air flowing through the acoustic modulator. Linear motion of the cylindrical shaped members to displace the same port area is only one half of the linear motion required in a previous design, resulting in an acoustic energy output waveform having a frequency which is double the frequency of an electrical sinusoidal input signal supplied to the acoustic modulator. Patents. (rrh)

Descriptors :   *ACOUSTICS, *PATENTS, ACOUSTIC WAVES, AIR FLOW, AIR PRESSURE, ELECTRICITY, ELECTROMAGNETIC RADIATION, EXCITATION, INPUT, LINEARITY, MODULATORS, MOTION, SIGNALS, SINE WAVES, SOUND, VALVES, VARIABLE PRESSURE

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE