Voice transmission system
US5138666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1991 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Sep 9, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/083
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention provides a combined microphone and amplifier assembly that is releasably connected to the voice emitter passage of a conventional face mask without requiring any penetration or structural modification of the face mask including the voice emitter passage of the mask. The combined microphone and amplifier assembly includes a body mounting and enclosing within a main compartment an amplifier circuit board and a speaker. The body further includes one or more battery compartments having selectively removable covers which afford ready access to the batteries contained within the compartments. Connected to the body is a mounting bracket that facilitates the quick and easy releasable connection of the combined microphone and amplifier assembly to the mask without any penetration or structural modification of the mask being required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.