Noise-protecting arrangement for ear protector
US6961436B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Apr 2, 2004 |
| Grant date | Nov 1, 2005 |
| Priority date | — |
| Expiry date | Apr 8, 2024 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F11/145
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A noise-protecting arrangement for ear protector includes an audio-frequency receiving unit, a first audio-frequency amplifying unit, a volume control amplifying unit, a current amplifying unit, a gain control signal unit, an impedance matching unit, a gain control unit, a gain adjusting unit, a volume regulating unit, a second audio-frequency amplifying unit, and an audio-frequency output unit. The noise-protecting arrangement automatically attenuates a noise that enters into the ear protector and is higher than a predetermined dB level, and thereby protects a user's eardrum. The ear protector with this noise-protecting arrangement is suitable for use in environments in which various machine tools, such as drills, millers, lathes and the like are operated, firing training is performed, high-pressure air horn, vehicles, and aircrafts are maintained, or other types of high-frequency noises exist.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.