Electrical audio signal processing systems and devices – Hearing protectors – electrical
Patent
1989-03-25
1990-09-18
Isen, Forester W.
Electrical audio signal processing systems and devices
Hearing protectors, electrical
A61F 1102
Patent
active
049583727
ABSTRACT:
The effectiveness of electronic earmuffs is improved by incorporating a mechanism which causes the middle ear muscles to contract before an intense sound is generated. This contraction is achieved by incorporating a wireless receiver into the earmuff. Immediately prior to the generation of the intense sound, the wireless receiver receives a signal which causes it to generate a loud, non-damaging sound in a loudspeaker in the earmuff. The received signal is generated by a radio frequency transmitter that is activated immediately prior to the activation of the mechanism producing the intense sound. The non-damaging loud sound from the loudspeaker causes the middle ear muscles to contract (this is a natural reflex of the ear). The intense sound is received outside the earmuff before the reflex contraction of the middle ear muscles has been relaxed.
REFERENCES:
patent: 3271520 (1966-09-01), Fletcher et al.
patent: 4181818 (1980-01-01), Shenier
patent: 4677678 (1987-06-01), McCutchen
Fletcher et al., "Protective Effect of the Acoustic Reflex for Impulsive Noises", Journal of the Acoustical Society of America, vol. 32, No. 3, Mar. 1960.
Isen Forester W.
The Commonwealth of Australia
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