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Patent Searching and Data


Title:
AUDIO INTERFACE DEVICE FOR PUBLIC ADDRESS SYSTEMS
Document Type and Number:
WIPO Patent Application WO2004070414
Kind Code:
A3
Abstract:
The present invention has all the properties and capabilities of a standard direct-box, which is an audio adapter circuit (Fig. 1) in a rugged chassis (Fig. 3A). It allows high-impedance stereo headphones (2) to be connected. It comes equipped with a switch (5, 6) that turns the signal to the exterior sound system on/off without interrupting sound to the headphones (2). The present invention also comes with a locking cover (20), which prevents inadvertent operation of additional switches, such as a ground lift switch or attenuation level switch (5, 6). The cover (20) also functions as a mounting structure.

Inventors:
LEHMKUHL JOHN E (US)
Application Number:
US2004003234W
Publication Date:
June 09, 2005
Filing Date:
February 04, 2004
Export Citation:
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Assignee:
LEHMKUHL, JOHN, E.
International Classes:
H02B1/00; H04B1/00; H04B3/00; H04H60/04; H04R5/00; H04R5/033; G01S; H04H7/00; (IPC1-7): H02B1/00; H04H5/00
Foreign References:
US5056148A1991-10-08
US2265438A1941-12-09
USD372224S
US6184482B12001-02-06
US5216355A1993-06-01
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