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.
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Inventors:
LEHMKUHL JOHN E (US)
Application Number:
PCT/US2004/003234
Publication Date:
June 09, 2005
Filing Date:
February 04, 2004
Export Citation:
Assignee:
LEHMKUHL JOHN E (US)
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:
| US5056148A | 1991-10-08 | |||
| US2265438A | 1941-12-09 | |||
| USD372224S | 1996-07-30 | |||
| US6184482B1 | 2001-02-06 | |||
| US5216355A | 1993-06-01 |
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