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- W2067734556 abstract "A small amount of control energy may be used to modulate the flow of an airstream of much larger energy content, thus making possible a large acoustic output from a small modulator. Following a study of the theory of the modulation process, an improved modulated airstream loudspeaker for use in speech systems was developed, constructed and tested. It features simplicity of construction and adjustment; freedom from fouling by water, dirt, and oil; and high output in the speech range. For class A modulation (having a maximum possible sine-wave pneumoacoustic efficiency of 50%), the following performance was finally achieved: control power, 10 available audio watts; airstream power, 700 pneumatic watts; and sound output, up to 100 acoustic watts through a 0.7-in. diam throat. With a horn having a directivity index of 10 db, the 30-ft axial sound-pressure level was 122 dbp. [This study was supported by the Signal Corps Engineering Laboratories under Contract DA-36-039sc-52667.]" @default.
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- W2067734556 date "1957-06-01" @default.
- W2067734556 modified "2023-09-23" @default.
- W2067734556 title "Modulated Airstream Loudspeaker" @default.
- W2067734556 doi "https://doi.org/10.1121/1.1918759" @default.
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